Roofing pie under a soft roof

Soft (bituminous) tiles are a relatively new building material. Its basis is fiberglass, impregnated with bitumen on both sides.

This design provides the material with fire resistance, moisture resistance and elasticity, which allows mounting tiles on pirogues. with curves and intricate details.

During production, mineral chips of various shapes and colors are applied to the surface of the tiles, which creates a wide range of design solutions.

The use of material in the arrangement of roofs is especially appropriate. with large angles slope slopes.

This name denotes a structure that fills the space of the roof between its outer and inner faces, that is space inside the truss frame. It consists of layers of various materials, each of which performs its function. Because of its layering, the design has a name similar to the name of the culinary product.

Pie roofing under improves waterproofing properties roof, provides its insulation. Separate layers are responsible for each of these functions, for example, a waterproofing layer is included in the cake to increase moisture resistance. The number of components of the pie depends on the type of roof: insulated roofs require more layers to be laid.

And now consider the scheme of the roof under the soft tiles in more detail.

Cold Roof Pie

Roof insulation is not necessary in cases where the owners of the house are not going to use the attic as a living space. Cold Roof Pie has a relatively simple structure and consists of six layers:

Soft tiles, unlike metal profiles, requires additional pads, fixing and strengthening the position of the coating.

Waterproofing is needed to prevent condensation in the interior of the roof. It can be placed not only under the crate, but also in front of it.

Mansard roof device

If it is planned to use the attic for permanent or temporary residence (that is, arranging it in an attic), then roof insulation becomes a necessary action. The insulation layer increases the thickness of the roofing cake and complicates its installation. Insulation also involves vapor barrier to avoid the negative impact of the internal condensate of the room on its materials.

Thus, roofing cake for soft tiles includes two additional layers. The completed design looks like this:

• Tiled covering.
• Lining carpet.
• OSB cover.
• Crate.
• Waterproofing.
• Rafter.

soft roof pie with insulation

Bitumen itself has good moisture-proof properties, therefore laying a separate waterproofing layer is not mandatory here, as opposed to installing a metal roof. But with a high slope angle and the presence of insulation, additional waterproofing will significantly increase the operational potential of the roof.

When laying the cake, it is important to leave small gaps between the layers to allow natural ventilation.

Waterproofing and vapor barrier

If roof pitch less than 18 degrees, the waterproofing layer is laid only in the most vulnerable places: ridge, overhangs, valleys, areas around pipes.

If more than 18 degrees, then the waterproofing is laid throughout the roof area.

Moisture-proof materials are divided into liquid and solid. The first are applied to flat roofs or having a small angle of inclination (up to 5%). If the roof has a greater slope, then materials in solid forms, such as film and roll, are used.

Since soft tiles are mainly for sloping roofs, then we will talk about solid waterproofing.

The highest quality of moisture resistant materials is waterproofing membrane. Its pores are not of a standard cylindrical shape, but funnel-shaped with a narrowing on the upper face. This form allows condensate to freely exit from the internal space of the roof, but does not let moisture in.

1. If special design solutions are not conceived, then waterproofing is laid between the rafters and the crate. On the rafters, it is fixed with a construction stapler, and with the crate it should be fastened with self-tapping screws.
2. The waterproofing of the soft roof is laid in the direction from cornice to ridge. The overlap between two sheets of material should not be more than 12 cm
3. The sheets are attached to each other with adhesive tape.
4. The film or roll may sag in the space between the edges of the rafters, but no more than 20 mm. Such sagging will improve the roof's ventilation capabilities.

vapor barrier also protects the inside of the roofing cake from moisture, but, unlike waterproofing, it prevents moisture from entering the interior of the house and not from the environment. Its main function is to protect the insulation, so vapor barrier is rarely installed on cold roofs.

NOTE!

When choosing a vapor barrier material, you should pay attention to particular attention to its strength, since during the operation of the roof it will be subjected to pressure from the insulation.

The most popular materials for vapor barrier films are polyethylene, aluminum foil.

waterproofing roof pie under a soft roof

The film is attached to the rafters with galvanized nails or staples. It is important to carefully connect all the joints, otherwise the condensate will penetrate into the inside of the cake. As with the installation of waterproofing, it is necessary to leave a slight sagging of the film to improve internal ventilation. But if a vapor barrier is mounted instead of a film, then sagging is unacceptable, the material must be stretched.

Before installing all the insulating layers, the rafters are treated with antiseptic impregnation.

Insulation of shingles

Despite the provision of moisture protection with vapor and waterproofing, the insulation material must also be sufficiently resistant to water so that it does not deteriorate at the slightest leakage of the protective layers.

Also important are criteria such as:

The most popular materials for insulation are mineral wool, glass wool, polystyrene foam, penoizol, polyurethane foam. These materials are distinguished by their low cost and resistance to negative influences. But it is important to ensure that they are well isolated from the living space, as small particles of some types of insulation (for example, glass wool) are harmful to humans with its constant ingestion into his body.

CAREFULLY!

Before installing the insulation, it is necessary to provide for the creation of gaps with both waterproofing and vapor barrier. This is necessary to ensure ventilation and prevent damage to materials when rubbing against each other.

Insulation of a soft roof is carried out in the following order:

1. Nails are driven into the lower edges of the rafters at all corners at the same distance from each other.
2. The thermal insulation material is slightly compressed and inserted into the space between the rafters.
3. Between the driven nails, the cords are threaded and fixed in a crosswise position, it is they who make the fastening of the insulation reliable.

Instead of cords, you can use a slatted wooden crate; it is attached not by diagonal crossing, but parallel to each other with a step of 40 centimeters.

Thermal insulation of tiles is carried out by analogy with other coatings.

Thermal insulation is usually placed in two layers. Insulation blocks should not protrude beyond the lower and upper planes of the rafters, otherwise the materials must be trimmed.

These are the main components of the soft tile roofing pie. Its main difference lies in the fact that the material of such a roof has good waterproofing, and the installation of a separate moisture-proof layer is not mandatory, but all other necessary elements are similar to pies of other types of tiles.

Useful video

What does a roofing pie look like for flexible tiles in video format:

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