Modern roofing materials require multi-layer reconstruction of the coating. This is done not only to improve performance. The use of a lining is also important for the aesthetic appeal of the result. Lining carpet - what it is and how to choose is described in this article.
What is underlayment
Roofing cake consists of several elements. Experts believe that the lining carpet is one of the most important among them.The material rolled into rolls is spread on a rigid base in the form of moisture-resistant plywood or OSB, that is, the lining carpet is laid directly under the flexible tiles and other types of soft roofing, which act as the finishing layer of the roof.
This layer is responsible for the level of waterproofing, reinforces joints and other weak points at the base of the roof. There are also additional functions that are responsible for the quality of installation of the roof itself as a whole.
The main objectives of the installation of the lining carpet of the roof:
- leveling the base - when laying a rigid base under a soft roof, it is required to leave expansion joints. This rule applies to any material: plywood, sheathing boards or OSB. Amateurs believe that they will be covered by a tiled layer. Soft tile behaves at very high and low temperatures behaves like hard linoleum. Having spread the latter directly on a concrete screed, we see all the bumps and dents on it. The tile will also show us all the joints and protrusions in the same way. With the reduction of the slope of the roof itself, the likelihood of visibility increases. The lining carpet compensates for unevenness and closes the seams, leveling the surface;
- reinforcement of waterproofing - for flexible shingles, the underlayment eliminates the possibility of water getting under the shingles of the material, which remains even with very high quality roof installation. It manifests itself especially strongly at the time of a thaw, mass melting of snow, snowstorms and hurricanes, any strong wind.
The most banal, but still important reason for installing a lining carpet under soft tiles lies in the guarantee for the material itself. The manufacturer of soft roofs removes the guarantee for the material in the absence of a lining.
Lining types
The main types of lining carpet for tiles:
- standard - there is no adhesive composition, fastening is carried out using galvanized roofing nails or metal staples and a stapler. The strips of rolled material are laid out with an overlap of 15 cm. The joints must be glued with a solution of bituminous mastic (Katepal, TechnoNikol);
- combined - on top the canvas is attached with nails with a large hat or staples, and on the bottom there is an adhesive strip that connects to the base. To do this, tear off the polyethylene strip at the time of installation. It is recommended to go through the joints with additional nails (Ruflex, TechnoNikol);
- self-adhesive roll - along the entire length of the strip there is an adhesive base hidden by a polyethylene film (Katepal, TechnoNikol, Docke);
- built-up web - laying the material is carried out using a gas burner. From below, the canvas is impregnated with bitumen, which adheres tightly to the base when heated. This type is in demand for wooden and concrete substrates, giving maximum adhesion. The very moment of installation is fire hazardous and it is not recommended to do it yourself (TechnoNikol, Delta Roof, Icopal).
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Complex roofs with a large number of breaks require the simultaneous use of different types of membrane. Each tile manufacturer himself produces a lining carpet for it, taking into account all the parameters.
Underlayment installation technology
The installation technology step by step with a photo represents the following stages of work:
- preparation - we prepare the base from a continuous crate with boards, moisture-resistant plywood or OSB. At the base, it is necessary to make ventilation gaps of 2-3 mm in size at the joints;
- the material is laid in the valley - the whole roll is laid out on the right or left side of the valley in an equal stripe. Be sure to follow the alignment of the edge from the middle. With a roll width of 1 m, 50 cm are covered on each side;
- laying the membrane along the ends and overhangs - with a continuous installation of the carpet, the ends of the roof and overhangs are next closed. It is necessary to glue over the entire width, deepening inward by 60 cm. On the eaves, it is required to step back from the edge of the inflection of 2 cm;
- vents and stove chimneys - protecting the bases around such places requires precision cut. The same part applies to skylights;
- final installation - when all the difficult places and joints are processed, you can lay the membranes on the remaining surface of the roof with a continuous carpet. The strips are laid out from top to bottom parallel to each other with an overlap of 10-15 cm, and when fastened with nails of 20 cm. After covering, the joints and seams are sealed using special glue or bituminous mastic. The horse is covered last.
Useful tips and tricks
The main advice is to buy a soft roof and lining membrane from the same manufacturer. Since they correspond to each other as much as possible in terms of the temperature regime of operation and guarantee maximum protection of the base.
A standard roll of carpet is a sheet 1 m wide and 15 m long. The type of your roof affects the choice of the type of material and the type of its fastening. A wide shed roof is easier and more convenient to make with a self-adhesive membrane.
Lining carpet for soft roofing - features
Soft tiles have an aesthetic appeal, affordable cost, comfortable installation and an excellent degree of surface protection from precipitation.Owners of private houses are actively purchasing this material for their roofs. A bituminous coating has a long operational period only with a reliable basis. The latter is popularly called a roofing pie, each element of which is equally important.
Regardless of the angle of inclination of the roof itself, it is imperative to use lining membranes under a soft roof. However, the angle of inclination also plays a role:
- the angle of inclination starts at 45 degrees - a solid carpet is not necessary. You can mount the valley areas, the perimeter roof and the ridge itself. Although in practice, such savings can result in leaks and serious damage to the finish layer of the roof. Rotting of a wooden base, the formation of mold or fungus on it;
- a roof slope of up to 18 degrees or more than 60 degrees requires a mandatory continuous underlayment. This requirement is spelled out in the instructions for soft tiles.
If these rules are violated, unforeseen situations arise in which repair work is expensive, and the service life itself is reduced many times. It is important to strictly follow the requirements of the manufacturer of the soft roof you have chosen when installing the roofing pie.
The lining membrane performs the following functions:
- waterproofing of a wooden base - protection against leakage, deformation or damage to its own finish coating (flexible tiles), which occur during temperature fluctuations;
- leveling the flooring under the surface layer of the soft roof - additional sealing ensures the preservation of the aesthetic appeal of the finish coating.With a large number of joints in the form of ventilation ducts, chimneys, slopes on the roof, etc., the elastic material of soft tiles at high temperatures will show all the irregularities of these places and will no longer take on the opposite appearance when the air temperature drops. The membrane hides these roughnesses, creating a perfectly even coating under the tiles.
Roofing pie under a soft roof
The lining carpet is a roll material in the form of a membrane with water-repellent properties. The main purpose of its flooring is to protect against leaks. The membrane mainly consists of a base on bitumen, fiberglass or fabrics of polyester origin. Fine quartz sand is added here, providing protection from the outside. During installation, the abrasive side of the coating is laid upwards, and an adhesive film remains below.
Roofing cake is a multilayer structure. Main parts from bottom to finish:
- vapor barrier layer;
- rafters and crate;
- insulation with mineral wool or expanded polystyrene boards;
- waterproofing;
- base in the form of a continuous flooring of boards or other materials;
- membrane lining;
- flexible roof.
Proper installation at each stage of work guarantees the durability of the roof and its reliability.
Self-adhesive lining carpet - what is it
A roll of self-adhesive underlayment along the entire length and width from below is covered with an adhesive layer, which is covered with a polyethylene film. The membrane with the help of this layer is securely attached to the base over the entire installation area. At first glance, this type is easier to install, but in fact, installation is more difficult.Since it is important to avoid the formation of air pockets and it is necessary to properly level the strip before gluing.
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The membrane makes it possible to create a solid carpet, which maximally protects against moisture penetration. In the cold season, it is recommended to heat the material, increasing the degree of adhesion of the adhesive composition and wood. Some masters even go through the joints with special roofing nails with large hats.
Lining carpet is a rolled material in the form of a membrane, which must be mounted under soft roofs. You need to choose the lining based on the requirements of the manufacturer of flexible tiles. Installation is carried out depending on the type of membrane. When laying on multi-pitched roofs and in the presence of a large number of joints on it, the type of carpet should be combined.
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