Roof waterproofing membrane. What is roof waterproofing membrane? What are waterproofing membranes, production technology, scope, how to choose a membrane
You will be interested to know that in Russia, in private housing construction, until the middle of the 20th century, waterproofing materials were not used at all, or roofing material was a rare exception. And given that the foundations at that time were also built without waterproofing, it is surprising how some houses still stand? Later, glassine and its analogues came into play, which also did not do its job very well.
And now, from abroad, high-quality waterproofing materials began to be supplied, which immediately launched similar production on the spot. Therefore, modern waterproofing film for roofing is already far from its unpretentious predecessors.
Today it is a whole scientific achievement, which helps to keep the under-roof space from even the slightest drop of rainwater. Moreover: the right film is up to 50% guarantee of durable and trouble-free operation of the roofing "pie". And what are the types of such films, and how to fix them - we will now tell you in detail.
Let's immediately note the differences between the two materials for roofing: waterproofing membrane and waterproofing film. Many believe that they differ in such parameters as vapor permeability, layering and price.
Yes, and manufacturers are also trying to convince everyone for marketing purposes that films are the past, and membranes are completely new material, although they do not draw any clear boundaries between these two materials.
This is partly true, but in fact, if we turn to the world encyclopedia of knowledge, we will find out that the membrane is "a thin flexible film, usually fixed around the perimeter." Therefore, it is more correct to consider the membrane as new, more modern look films.
And the principle of operation for both films and membranes is practically the same - to protect the under-roof space from dampness and leaks:
Also, the installation of conventional and modern films remains similar to this day:
How to choose a film for roof waterproofing?
Let's now take a closer look at what assortment the modern market offers today, and what materials are popular with roofers. Moreover, there are a lot of types of modern roofing films, depending on what exactly you want to get in the final.
UV resistance
Have you ever noticed how fragile the film becomes, and what tatters it can turn into after being outdoors for just one summer? Especially if you bought the cheapest one on the market and just covered the bricks with it, for example.
And how much fresher can look almost the same, at first glance, greenhouse cover, although it has withstood the same number of sunny days. It's not about the thickness - it's about such a parameter of the film as resistance to ultraviolet rays.
UV resistance only at first glance seems to be an insignificant parameter for a roofing film - after all, it will be hidden under facing material! Yes, it is, only many people forget about force majeure circumstances. For example, let's say you bought a waterproofing film with low UV resistance, and you plan to spread and cover it in one to two days.
The team is in place, the film is quickly “stapled” along the crate, and only a simple installation of the roof remains. And then - unexpectedly - rain, thunderstorms, lack of material, loss of fasteners, power outages and much more. A few days of such downtime on hot days can reduce the strength of such a film by 50%! Now calculate how much its final durability will decrease accordingly.
So is it worth the risk? Believe me, completely removing all waterproofing, driving for a new one and re-carrying out all the installation work is not a pleasant thing, especially pulling out pieces of an old (unexpectedly outdated) film from under metal brackets.
You will be surprised, but even quite expensive branded waterproofing films can have a very low UV resistance. They're just for indoors. installation work, and not for the roof, which, unfortunately, not every seller will tell you about.
Life time
The second important requirement for a waterproofing film is durability. You don’t want to completely dismantle the roof every 5 years to re-lay the waterproofing, do you?
Therefore, most manufacturers add special components to the composition of such a film that enhance strength and wear resistance. Such, for example, are modern reinforced films for waterproofing roofs:
Water pressure strength
There is also such a characteristic of a waterproofing film as the ability to withstand the pressure of a water column. This is its quality, which allows for a long time to keep under the pressure of water and not let it inside.
Do you experience heavy or prolonged rainfall in your area? Then pay attention to this option. Or is your roofing material so arranged that snow flies under it and melts there, like a metal tile?
Those films that are mounted without joints, immediately with a whole roll, do well with such films:
For example, the most optimal waterproofing option for such roofs is a three-layer subroofing film with a load-bearing reinforced grating and lamination on both sides. This is an excellent water vapor barrier.
Base adhesion
There are two types of waterproofing film: welded or mechanically laid.
The deposited polymer film has a multilayer structure. bottom layer is a thin film that melts easily at elevated temperatures. Such waterproofing is especially convenient for roofs of complex construction, but close attention must be paid to the tightness of all its joints.
In the second case, the film is attached in the usual mechanical way - with staples or nails. This can be mounted on any base - concrete, wood or profiled sheet, it is only desirable that it be as even as possible.
Anticondensate
The so-called anti-condensation films are also good for roofing, which must be laid with two ventilated gaps. This is an almost indispensable waterproofing if the roofing material is metal, from which something always drips.
Anti-condensation films are distinguished by the fact that they contain a special moisture-absorbing material that retains a large amount of moisture. Such a film is denser in thickness and has a roughness.
Non-flammable, durable and resistant to ultraviolet rays, however, has a low vapor permeability. If you like this option, then consider ventilation.
And the installation of such a film is no different from the usual:
Price and quality
Be wary of the cheapest films on the market. The fact is that those are almost always made from polypropylene wound on coils, and as a result, the roof then has no waterproofing or wind protection.
The advantages of more expensive and modern films are that such waterproofing not only protects the under-roof space from moisture getting inside, but also helps to evaporate it. About this - now in more detail.
And further. There is a common belief that the roofing film is easily torn already during the installation process. roofing sheets, and in the future requires replacement almost every year. Which is quite troublesome, of course.
In fact, the film is really not capable of serving as a separate coating due to its fragility (leave it for the winter - only rags will remain by spring), but as an important part of everything roofing cake copes with its tasks by 100%.
And even small breaks in the film from fastening with staples are not really critical - this moisture will easily evaporate at the very first rays of the sun. Remember that it is always noticeably hotter on the roof than below.
Vapor permeability
And finally, one of the most important parameters of waterproofing films. The first thing you need to figure out is your roof will be "cold" or "warm". Those. insulated or not, which directly depends on whether you place a residential attic under the roof or leave a simple attic.
And do not rush to immediately choose the path of least resistance, leaving this area uninhabited - the fact is that over time, rooms “end” in any spacious house, and you want to equip at least some closet for the same billiard room, private office or workshop. Therefore, if your budget allows, immediately do everything to the maximum.
And, if the attic of your house is likely to be insulated, then a simple vapor barrier film for such a roof can no longer be used: firstly, it is not suitable for these purposes and will not last long, and secondly, there will be problems with the insulation itself.
The fact is that a standard waterproofing film has two-circuit ventilation: between the roofing and waterproofing, and between the insulation and waterproofing. With the help of this material, the so-called "cold" roof is arranged.
But for a “warm” device, the moment is important that the steam from the insulation comes out, and the waterproofing film does not interfere with it:
Of course, modern films already have this property more:
What does the modern market offer?
And it offers many options. Therefore, let's first of all learn to understand the labeling and take a closer look at some of the most popular brands.
Marking
So, the AM marking denotes a film, which is a breathable membrane.
Films A and AM are designed primarily to pass steam well.
But films of class A and B are real blotting papers from a notebook, the main task of which is to absorb and then quickly weather moisture. And they do a really good job with their work, if only the ventilation gap is thought out and equipped.
Brands
So, firm Yutafol. These are high-quality waterproofing and vapor barrier films, accessories for installation and a guarantee. Such films are made of durable polymers:
Waterproofing vapor-permeable membranes Tyvek. This material can be called "smart": it removes excess steam, prevents moisture from entering the under-roof space and lasts a long time.
Tyvek membranes have been in production for decades. Their main advantage is the possibility of laying directly on the insulation, without an air gap. Thanks to this, you can refuse the crate and save a lot on it.
The Delta membrane is used for waterproofing under roofing, and is especially invaluable for roofing made of piece materials and metal rebate. It can be safely used on roofs with a very small angle of inclination - 10 ° less than recommended.
And among domestic films Izospan are especially popular:
How to properly install waterproofing film?
Let's start with the construction of the crate. When installing rafters, do not allow the distance between them to be more than 1.2 m. The optimal distance between the waterproofing film and the roof insulation is 40-60 mm.
Remember: you can work with a waterproofing film on the roof only in dry weather, as soon as the rafter system is fully installed and insulation is laid, if any, is planned.
We spread the film
Laying a waterproofing film has its own technology: from the eaves to the ridge, overlapping, and only this way. Mounting the film is simple: we make it so that rainwater always leaves the roof. It is only important to prevent water from flowing into the roof space. And the lower edge of the film ensures the removal of dripping drops into the gutter.
Unlike dense membranes, the usual waterproofing film should be spread along the roofing cornice so that it sags between the rafters by 1-2 cm. Such sagging is also necessary so that condensate does not collect on the rafter system:
But the anti-condensate film is spread on the rafters down with an absorbent surface. Secure it with either a construction stapler or special galvanized wide-head nails. Make sure that its lower surface does not come into contact with the insulation anywhere.
We make the right overlap
The overlap of the waterproofing film is made different, depending on the slope of the roof:
- With a slope of less than 30 °, the overlap should be within 15-20 cm.
- With a slope of 12-30 °, an overlap of 25 cm is required.
- If you are waterproofing pitched pitched roofs, increase the overlap on the ridges by another 5 cm.
We fix with slats
And after you have spread the waterproofing film, fix it additionally with 3x5 cm slats, nailing them over the rafters with the same galvanized nails. And on top there is already a crate, which has its own parameters for each roofing material.
We seal the joints
For all film waterproofing materials, the rule is the same: all joints of waterproofing materials must fall on the rafters. But the adhesive materials for different types own are used.
For example, ordinary films are simply glued with adhesive tape, and additionally sealed with a dispersion.
Installation technology of modern membranes
If your roof has a relatively low slope or a long valley, we recommend that you put two layers of membrane.
Modern volumetric membranes must be laid strictly parallel to the cornice overhang. Each next roll should overlap the attachment points by at least 7 cm, and glue the overlap area with special glue.
Apply the membrane around the chimney 5-10 cm above the future roofing. Be sure to seal the cuts at the corners.
To seal modern membranes, whole sets of adhesives are used. Although some of these films already have sticky edges that do not require tape.
Apply the membrane to the valley sheets with the same overlap, and fasten with staples or nails. Glue all overlaps in the valley.
If you get in the way of skylights, bypass them in the same way as pipes, taking into account the recommendations of their manufacturers. Basically the rules are: when working with skylight apply the membrane to a 5 cm wide window frame. Fasten and seal all connections as in the picture. By the way, special seals are often provided for such windows.
How to check the reliability of waterproofing?
OK it's all over Now! You can check how correctly your roof waterproofing is done in the end, according to the following three points:
- Point 1. Waterproofing is laid under all roofing elements, cornices and gable overhangs.
- Point 2. The lower sheet of waterproofing is brought out beyond the cornice strip - to the frontal board or into the drainage system.
- Point 3. The waterproofing film adheres securely to the walls and pipes on the roof.
Everything is just like that? Congratulations! You will not have problems with roofing waterproofing, and this is already half the battle!
A few decades ago, the roof was not supplemented with a waterproofing layer, and it is not at all strange that houses built in the 20th century were so often destroyed. Today, roof waterproofing is one of the most important stages in the structure of premises. The duration of the operation of the roof, and the whole building, directly depends on the correct choice of waterproofing material. The building materials market offers an extensive range of waterproofing for the roof, but the waterproofing membrane for the roof has proven itself better than the rest.
The roofing waterproofing membrane came to us from Western countries, where it was discovered much earlier, and is already successfully used in the construction of new structures. This type of waterproofing material is so advanced that it is able to completely protect the roof from the slightest drops of water. Membrane film is used in all types of premises, including household, industrial and residential.
In fact, membrane films are the same polyethylene options, the difference is that this material for waterproofing consists of many small holes through which steam is removed. The membranes are able to perform the function of not only moisture protection, but also protect the roof from gusts of wind, remove excess moisture from the heat-insulating layer, preventing the insulation from getting wet and rotting. The material can even be used as a temporary roof, the membrane film will protect the room from rain and snow for two months. Among the positive qualities of membranes, one can note their high strength, they are able to withstand 10 kg per 5 cm of film, and stretch well. They do not break during installation, and also have an optimal level of fire resistance, are not susceptible to sunlight.
Types of membrane waterproofing
Waterproofing membranes can be divided into several types:
- diffusion;
- superdiffusion;
- anti-condensate.
Each option has its own characteristics and specifications. For example, the diffusion version of the film is characterized by the presence of many holes that do not allow water to pass through from the outside, clearly isolating the room from the liquid, and from the inside, they perfectly pass steam. During installation, the film should be pressed very tightly against the roof, as the pores can become clogged and the steam will not go out well. The diffusion material is environmentally friendly, does not emit toxic substances when heated, and is resistant to the harmful effects of bacteria and fungus. The scope of this type of membranes is very wide, the material is used for waterproofing:
- polymer tiles;
- slate;
- ceramic tiles;
- ondulin;
- metal tiles.
Diffusion membranes can also be divided into low diffusion membranes - their permeability is less than 300 mg of steam per 1 m2 per day, medium diffusion options carry out from 300 to 1000 mg / m2 per day, and high diffusion material, it has a vapor permeability of more than 1000 mg / m2 / day.
The latter option is also called the superdiffusion membrane. This is a new generation of waterproofing, it is used in areas with a harsh climate and high humidity. Roof waterproofing from this material can last 100 years. The main difference from diffuse membranes is the rate of water and moisture removal. The difference also lies in the manufacturing technique. Superdiffusion materials are made from 4 layers of polypropylene. Such multi-layering gives strength to waterproofing, but at the same time flexibility and stretchability are fully preserved. Unlike most film coatings, superdiffusion options do not require gaps that are left for better ventilation. They can be mounted directly on the insulation, without the use of a wooden lattice.
It is important to note that superdiffusion type cannot be used when covering the roof with a metal seam roof, efroslate, and metal tiles without an acrylic ball. These types of roofing material get very hot in the sun, and when the difference temperature conditions form a lot of condensation. To cope with such an amount of moisture, only anti-condensation films are capable of.
The waterproofing of a roof made of metal tiles has its own characteristics; to ensure reliable protection against moisture, anti-condensate membrane films should be used. They do not let excess moisture out, but instead, they retain water from the back with villi. This allows moisture to escape through the air currents of the ventilation gap, the installation of which is mandatory.
It will be interesting to know that according to laboratory studies, due to moisture retention, condensed heat can increase the insulation of a house by 40% and reduce the cost of heating it.
The film is anti-condensate, unlike roofing material and bituminous waterproofing, has a small weight and does not load the truss system. It is very easy and quick to install and functions well even in full sun.
Trademarks manufacturing membranes
Today, many companies are engaged in the production of materials for waterproofing roofs, but, as elsewhere, there are leaders among them that have proven themselves well and there are outsiders, you should not buy goods from which you should not. In the ranking the best manufacturers membrane films, the championship belongs to the company Yutafol. The durability of the product has been tested by independent experts, the products have the best performance, are produced in small rolls, and cost $ 1 per linear meter.
In second place is Tyvek, which has been manufacturing roofing building materials for many years. The company's assortment includes "smart" membranes that remove accumulated steam, preventing moisture from seeping under the roof. Membrane type film, can be used for different types roofs, in addition, there are options that have an anti-reflective coating. They are great for waterproofing residential attics or mansards.
The third place belongs to the company TechnoNIKOL, the products of the campaign are not focused on Europe, as in the previous two cases, but on our climatic zone. The film has a high resistance to tension, is not exposed to ultraviolet radiation and aggressive substances, and is inexpensive from $ 25 per roll.
If you want to provide your home with reliable waterproofing, remember that the choice of membrane film is only half the battle, much more attention should be paid to its installation. If the installation is not done correctly, then even the most expensive waterproofing material will not meet the requirements placed on it.
Warning: Use of undefined constant WPLANG - assumed "WPLANG" (this will throw an Error in a future version of PHP) in /var/www/krysha-expert.php on line 2580
Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/krysha-expert.php on line 1802
Warning: Invalid argument supplied for foreach() in /var/www/krysha-expert.php on line 2735
The domestic construction industry has been using waterproofing membranes relatively recently, for good reason. Insulated roofs have only recently begun to be built, which require modern and very quality materials. Previously, these types of roofs did not exist, and for flat roofs ordinary ruberoid was used. This coating, in all respects, is significantly inferior to modern ones and is unacceptable for use on complex roof structures. This situation explains the extremely low quality of the old flat roofs, the constant leaks of which created a lot of inconvenience for the inhabitants of the last upper floors.
Advanced foreign scientific laboratories worked on the creation of modern innovative waterproofing membranes, as a result, a wide range of products was introduced into production. modern materials. They not only have different appearance and cost, but also different physical characteristics.
Many inexperienced builders do not understand the difference between these most commonly used materials. The confusion is further aggravated by the marketing moves of manufacturers who try to use attractive and incomprehensible words for ordinary people in the name of their products. For acceptance right decision when choosing a specific material, it is necessary to know the differences between different materials, they should take into account the tasks and operating conditions as much as possible.
Membrane or film - which is better?
Waterproofing films
Single-layer material, most often made of polyethylene. It has a different thickness, on which the strength indicators depend. The films are completely impervious to both steam and water. Their use makes it possible to reduce estimated cost works, but use is not always possible.
Due to the fact that waterproofing films do not allow steam to pass through, they cannot be used during construction with thermal insulation from mineral wool. The fact is that mineral wool quickly absorbs moisture, after which its parameters deteriorate significantly, and the efficiency warm roof decreases. In addition, wet cotton wool has an extremely negative effect on wooden structures. truss system, they quickly rot and lose their original values of physical strength. The only way to solve the problem is to use modern special membranes.
waterproofing film prices
Film for waterproofing
Waterproof membranes
Complex materials that have several layers with their own physical characteristics of each of them. The strength depends on the base, it can be non-woven or made of woven filament materials. Most often, the membrane consists of one or two layers of propylene textile and a layer of polypropylene. Textiles are responsible for indicators of physical strength, polypropylene passes steam, but is watertight.
Membranes can be called diffusion and superdiffusion. What is the difference between them? Diffusion - the ability to slightly pass steam. Superdiffusion - the ability to pass a large volume of vapor molecules. That's all the actual differences. For example, if an ordinary diffusion membrane can remove no more than 1 kg / m2 of steam per day, then a superdiffusion membrane passes up to 2 kg / m2.
The purely technical difference between materials has received an attractive and mysterious name for one of them. Due to this, it is possible to unreasonably increase the cost of production and the profitability of the company. The fact is that technologically it is much easier to manufacture superdiffusion membranes than ordinary ones. Vapor permeability depends on the size of the micro-holes, the smaller they are, the lower the vapor permeability. Accordingly, it is technologically easier and cheaper to manufacture a superdiffusion membrane with relatively large holes, but their selling price is higher.
Table. Popular brands of waterproof membranes
| Name of the waterproofing membrane | Description and brief technical parameters |
|---|---|
| It is made on the basis of polypropylene, consists of two layers, the material is non-woven. It has a high vapor permeability (2000g/ m2), universal use. It protects the internal structures of the truss system and heaters from saturation with steam, does not allow condensate to pass through. |
|
| The high density of the top layer does not allow air currents to remove heat from the thermal insulation, which has a positive effect on the efficiency of roofs. It has a special coating that reflects infrared thermal radiation, it does not leave the roof space. The base is distinguished by high rates of physical strength. | |
| Goods of domestic producers, traditional waterproofing material. High strength makes it possible to use on crates with a large step of laths. The membrane is used not only on roofs, but also to protect walls from getting wet. Perfectly passes steam, it is completely tight for water. | |
| Modern innovative four-layer material with improved physical and operational characteristics. Creates optimal conditions for operation wooden structures rafter system and heaters. Features an extra layer to increase resistance to harsh UV rays. | |
| Due to high vapor permeability, it can be laid directly on the insulation - lighter, faster and cheaper construction works. It has three layers, is characterized by high values of tensile strength. Can be used outdoors. | |
| The base is a non-woven fabric, has a high vapor permeability. It consists of three layers, two outer ones reliably protect the underlying materials and structures from water. Through the use of innovative technologies, performance indicators increase, the thermal conductivity of complex roofs decreases. |
Prices for PVC membranes for roofing
PVC membrane for roofing
Practical tips for laying waterproofing membranes for roofing
Quality and technical characteristics play an important role in the reliability of the protection of structures against waterlogging. But not only these factors need to be taken into account. If the production technology is grossly violated, then even the most expensive membranes do not fully perform their functions, the performance of the roof will not meet the expected values, and in some cases, instead of benefit, there will be significant harm.
How to properly install a roof waterproofing membrane?
Step 1. Prepare your tools. You will need a stapler, ordinary scissors, a hammer, carnations with large hats and ordinary ones, a mounting knife, wooden slats for the counter-lattice. It is necessary to work in comfortable shoes and use insurance. To secure the membrane to metal surfaces and gluing joints use special sealing tapes, they are sold complete with waterproofing materials.
Step 2 Fasten the cornice strip. This is a metal additional element that directs drops of condensate from the waterproofing film into the gutter of the drain system. The bar is nailed with studs in a checkerboard pattern at a distance of about 30–40 cm.
Step. 3. Glue a special double-sided adhesive tape on the dropper, the lower edge of the first row of waterproofing will be fixed to it.
Important. The surface of the strip must be dry and clean, the adhesion strength largely depends on this.
Step 4 Start laying the material. The membrane must be strictly parallel to the cornice strip. At the edge of the slope, leave an overhang about 20 cm long, fix the position of the roll with a stapler.
Step 5 Continue to roll out the roll, fasten the material with a stapler to each rafter leg. Staples should be driven only in those places that will subsequently be covered by the next row. On the material in the upper part there is a specially marked strip 10 cm wide. Constantly control the position of the membrane, avoid distortions. There is another option for fixing the membrane - roll it out to the entire length of the slope, correct the position, and only then start fixing. Which method to choose should be decided independently, taking into account the existing conditions. The membrane does not need to be strongly stretched; during fluctuations in the size of the truss system, it can break. Always leave a sag of no more than one centimeter at the lowest point.
Step 6 At the opposite end of the slope, cut the film, leave a margin of about 20–30 cm. Secure the material with staples.
Step 7 Tear off the protective paper from the adhesive tape and stick the membrane. Press it firmly, do not leave gaps, if necessary, align the position a little.
Step 8 Proceed to the final fixation of the membrane on the rafter legs. For these purposes, wooden slats 20 × 40 mm should be used. During fastening with a stapler, holes were punched in the material; a special tape must be used to seal them. It has an adhesive layer on both sides, the thickness of the tape is about one millimeter, the material is plastic and easily levels out various small irregularities. Glue it to the rails, remove from reverse side protective film and nail and to rafter legs. Thus, all holes on the membrane are securely closed. The distance between the carnations is 40–50 cm.
Using the same algorithm, continue mounting the membrane along the entire height of the slope. Make a kink at the ridge and secure the waterproofing membrane to the adjoining roof slope. The second slope is closed according to the same method, an inflection is again made on the ridge, only already on the previously covered slope.
Now you need to properly nail the counter rails. Their dimensions and distance must take into account the technical characteristics roofing materials. For flexible coatings, you need to make a solid base of OSB, plywood or edged boards. Under metal and slate roofs, a crate is made of slats.
To protect the under-roof space from moisture, a waterproofing film for the roof is used for the construction of modern houses. The article provides information about the purpose, properties and varieties of this material. It also describes the main stages of installation and selection criteria. This information will allow you to choose desired material and avoid unnecessary costs.
Purpose of roof waterproofing
Moisture can penetrate under any roofing. Atmospheric precipitation finds cracks in the joints of slate and ondulin. Gusts of wind blow drops of water under the tiles. Condensation of vapors emanating from living rooms also significantly increases the moisture content of roofing materials. Even the most modern insulation is not able to protect the room from dampness, cold and other negative factors caused by the wetting of the coating.
The main purpose of the waterproofing film is to protect roofing materials from excessive moisture. The right choice and professional installation affects the safety of the entire coating, greatly increasing its wear resistance and durability. This is due to the fact that excess moisture can cause rotting of the wooden elements of the truss system, which can lead to destruction. finished construction roofs.
Summarizing the above, the main functions of the film waterproofing of the roof are determined. They are as follows:
prevention wooden elements of the roof structure from the effects of moisture penetrating under the roofing outside due to atmospheric precipitation;
building impact protection vapor rising from within premises.
In the construction market, roll materials for roof waterproofing are presented in a wide range. For determining the best option suitable for a particular structure, one must clearly know the properties and conditions for the use of membranes.
Properties of waterproofing film
Some homeowners are intimidated by the rather tangible costs that accompany the installation of the material in question. However right choice film waterproofing is able to get rid of unnecessary problems arising from the premature destruction of the coating. Particular attention is recommended to be paid to meet the basic material requirements imposed by conformity to a particular type of roof. When deciding which membrane to choose for a roof, the following qualities must be considered:
material must have moisture resistance- to protect against the effects of precipitation and condensate;
important property is resistance to ultraviolet, protecting the film from destruction by the sun's rays;
waterproofing material for roofing must be able to maintain its intended qualities, regardless of temperature regime;
The waterproofing film must have moisture resistance Source leksholding.ru
coating durability is increased due to increased mechanical strength film tested by tear resistance;
at the expense anti-condensation characteristics material provides protection of the roof structure from negative impact vapors rising from living quarters;
elasticity film waterproofing allows you to withstand significant loads caused by the installation and subsequent operation of the roofing.
The proposed list is only a short list of the necessary qualities that a roll material must have to protect the truss system of a building from moisture. Let us consider in more detail some of the properties that characterize the waterproofing film for the roof.
Criterias of choice
When building a house, each owner counts on the durability of the building. Therefore, it is important to pay due attention to the quality of materials, not paying much attention to their cost, so as not to become like a miser, forced, as the saying goes, to pay twice.
By purchasing cheap products, the risk of its rapid failure increases, entailing the need for unplanned repairs. Source doka-realty.net.ru
Roof waterproofing membrane has a number of specific characteristics that are recommended to consider when choosing the right material. Some of them require detailed consideration.
Preservation of original properties under the influence of sunlight
The influence of ultraviolet radiation on many waterproofing films is expressed by the acquisition of increased fragility and brittleness. Therefore, one of the main selection criteria is the stability of the membranes under the influence of the rays of the merciless luminary.
Although in the final version of the finished roof, the membrane waterproofing of the roof is protected from direct contact with sun rays several layers of other materials, unforeseen situations occur during the installation process. So an unplanned delay in construction could result in the film being left uncovered indefinitely. Ultraviolet in combination with the wind can cause the destruction of the structure of some materials, which negatively affects their protective characteristics. First of all, the strength of the membrane and its resistance to moisture suffer.
Professional builders recommend choosing a film waterproofing that is resistant to ultraviolet radiation. This parameter is indicated on the packaging provided by the manufacturer. It should be noted that not all expensive membranes are characterized by a similar quality, collapsing in the sun.
Lifetime
When building your own home, the owner has the right to count on its durability. When investing a lot of money in your future home, you should not save on waterproofing. Of course, you can choose a cheap membrane, which will collapse in a few years, thereby rendering the truss system unusable, subject to unplanned repairs. It would be much more expedient to purchase a waterproofing film from a trusted manufacturer with an impeccable reputation gained thanks to high quality supplied products. Such manufacturers are not afraid to indicate the approximate period of trouble-free operation on the packaging. roll material. The absence of this parameter indicates the uncertainty of the manufacturer in the quality of the product, and such an acquisition will be an unreasonable waste of money.
Anti-condensation characteristics
Laying a metal coating on a roof structure after preliminary insulation causes the formation of a large amount of moisture in the under-roof space. For such cases, it is recommended to choose a membrane waterproofing with an effect that prevents the accumulation of condensate.
This type of film has a special layer made of cellulose. Thanks to it, moisture is absorbed and reliably retained up to certain conditions. These are either an increase in wind strength or an increase in temperature, contributing to the evaporation of condensate. To facilitate the process, by fixing the counter-lattice, special gaps are formed that separate the membrane from the roofing, as well as the waterproofing film from the insulation. Such ventilation accelerates the evaporation process.
The positive qualities of anti-condensate films include increased strength and resistance to ultraviolet radiation.
Vapor permeability
This criterion must be taken into account during the capital insulation of the roof or during the construction of the attic with the subsequent planning of living rooms. The mold that has formed in the insulation layer due to accumulated moisture is a sufficient reason for the destruction of the wooden elements of the roof structure. In addition, the condensed liquid significantly reduces the thermal insulation characteristics of the material. Therefore, for such situations the best way suitable waterproofing, the membrane of which has the property of vapor isolation.
The cold roof protects only the truss structure and the attic, which has separate system ventilation. For such cases, ordinary film waterproofing is sufficient, without special qualities that affect the cost of the material.
On our website you can find the most . In the filters, you can set the desired direction, the presence of gas, water, electricity and other communications.
The waterproofing film has the property of insulating steam. Source stroyday.ru
Types of roofing roll waterproofing
An interesting fact, but quite recently, during the construction of private houses in Russia, protection of the roof from moisture was not given due attention. The experience of using film waterproofing adopted from foreign colleagues is currently very popular with domestic builders, significantly extending the period of trouble-free operation of the roofing system. This is facilitated by an extensive selection of roll material offered by manufacturers.
Many owners of private properties are interested in a film for the roof of a house, which better fit specific building. Let us consider in more detail the most popular types of products in question.
With the development of the chemical industry, polyethylene has firmly established itself in the domestic market. Based on it, many Construction Materials. Roofing waterproofing, the film of which is made on the basis of polyethylene, has several modifications. Among them, the most widespread are the following subspecies:
a membrane made of high-strength polyethylene that does not have vapor permeability, preventing the penetration of air and moisture, requiring separate ventilation due to gaps separating it from the outer layer of the coating and internal insulation using a counter-lattice;
microscopic holes contribute to the excellent transmission of water vapor, protecting the insulation from unwanted moisture in a perforated film, which has the alternative name "hydrobarrier" or "anti-condensation membrane". The maximum period of trouble-free use of such material reaches 25 years;
fiberglass mesh, closed on both sides with high-density polyethylene, makes up the structure of a reinforced film characterized by high strength.
Such material is most widely used for waterproofing greenhouse roof structures. Reinforced membranes are more securely fixed to the truss system without causing excessive sagging. This contributes to an increase in the efficiency of moisture removal from the internal space of the roof, despite the absence of such quality as vapor permeability in polyethylene films of this subspecies.
Polypropylene membranes
More pronounced strength, complemented by UV resistance, which characterizes the material for the manufacture of such films, allows for a long time to protect the interior of the attic from precipitation. This allows you not to rush with the installation of the top layer of the coating, preparing for the most efficient implementation of the process.
Due to the hygroscopicity of the viscose-cellulose fiber applied on one side of such hydro-barriers, the condensate that accumulates near the surface of the insulation is completely absorbed. Further elimination of moisture occurs under the influence of natural air flows circulating inside the roofing pie.
When installing polypropylene membranes, the viscose-cellulose layer must face the insulation. In addition, to ensure ventilation, it is necessary to maintain a gap between the materials of at least 5 mm.
The unique properties of parchment allow it to be used for insulation against moisture and steam. Liquid bitumen used to impregnate the material prevents wetting. The natural ingredients used in the production of glassine contribute to the absence of the greenhouse effect. The main base component is cellulose.
Many owners involved in the construction of their own houses are attracted by the ecological cleanliness of parchment roof insulation. Also, the advantages of this roll material include ease and accessibility of installation, supported by low cost.
In the modern construction market, glassine is represented by three modifications. They differ in the quality of the raw materials used, which affects the final cost of production, and in the abundance of impregnation with bitumen. The most expensive is the "breathing" parchment, represented by the P-350 brands. It is he who is involved in the formation of a ventilated roofing pie.
breathable membranes
They are the most expensive material of all the films under consideration. However, the costs are offset by the quality and durability of the products. In addition, the absence of the need for a counter-lattice is attractive, since the perforated membranes allow fixing directly on the insulation layer.
The synthetic fibers that make up the basis of the non-woven fabric serve as an excellent protection against wind and moisture. Unlike single-layer membranes, two-layer "breathing" films can be fixed on the insulation on either side.
The division of the considered type of roof waterproofing into three categories is justified by the different level of vapor barrier. Manufacturers provide the following types of breathable membranes:
have the lowest vapor permeability pseudo-diffuse films. Such material requires the arrangement of a ventilation gap between it and the insulation;
characterized by an average level of vapor permeability diffuse membranes;
high vapor permeability is a hallmark super diffuse films.
Pseudo-diffuse films have low vapor permeability Source stroytorgk.ru
Video description
The following video will help you make the best choice of film coating suitable for waterproofing a particular type of roof.
Mounting Features
First of all, it is necessary to observe increased safety measures, since roofing work is carried out at a height. Extreme care is the key to maintaining health.
In general, the process of laying the hydro-barrier of the truss system is not particularly difficult. Even a novice master will cope with such work. The main condition for the successful completion of all manipulations is the presence of a construction stapler and a certain number of metal staples.
Like all construction activities, the installation of a film sheet for roof waterproofing requires pre-training. A good result is guaranteed if the following rules are observed:
minimum distance between adjacent rafters should be 1.2 m;
work is prohibited in wet weather;
required to form gap with a minimum size of 40 mm between the hydrobarrier and the insulation;
the film web is fixed in the direction down up with a slight overlap of about 15 cm;
Ultimately, the laid film should sag slightly to a depth of about 20 cm.
On the construction market, there are self-adhesive membranes fixed by heating with a burner. All measures for the installation of a profile film web can be divided into several main stages. Each of them requires separate consideration.
Stage 1
The roof surface is free from foreign objects. The rolled web is evenly distributed on the plane, taking into account the overlap. Strips of the required size are measured, after which the film is cut.
Video description
In the video you can see the installation of a waterproofing membrane:
Stage 2
The membrane is fixed with a construction stapler. Thin slats are fixed on top with nails, providing better contact of the roll web with the base.
Film mounting Source thisbuildis.com
Video description
In the video you can see the installation of a waterproofing film:
Stage 3
Since the roof is not a perfectly flat plane, and there are additional elements, like chimneys and ventilation pipes, it is impossible to evenly distribute the entire canvas of the hydrobarrier. Therefore, the film is cut in the required places. To seal the edges, a special paste-like agent is used. The same purpose is served by a special adhesive tape used in the area of the valley and other complex elements of the roof structure.
Video description
The following video shows the installation of Tyvek waterproofing membrane:
Conclusion
Having become acquainted with the variety of waterproofing films, having studied them quality characteristics, you can make the right choice of material that meets the requirements of a particular structure. Useful recommendation is not to pay attention to cheap products. All costs, of course, are compensated by the long-term trouble-free operation of the roofing system, providing peace and comfort to your home.
