Roll roofing

Roll materials can provide watertightness even at zero slopes, and the upper limit of the recommended slopes is 45-50 °. They can be laid on any solid (wooden, concrete, etc.) base.

There are several main methods of laying roll materials, according to which these coatings are divided into:

1.adhesive:

• on hot bituminous mastics;
• on cold rubber-bitumen, bitumen-polymer and polymer mastics and adhesives;

2.processed:

• on oxidized and modified bitumen;
• hot (fired) method using gas burners;
• hot (fireless) method using infrared equipment;
• cold (fireless) way, i.e. dissolution of the thickened bitumen layer;

3.with adhesive:

• materials on the inside have a special protective coating (silicone film or paper), which is enough to remove; then roll the roll onto the primed surface.

The oldest method of installing roofing carpet is the continuous gluing of roll materials to the substrate. In some cases, it is advisable to lay roofing materials using the so-called partial gluing. This eliminates the conditions for the appearance of excess pressure due to the formation between the roof and the base of an air gap communicating with the outside air along the roof contour or through special exhaust deflectors. Roofs made in this way are called “breathable”.

The use of “breathable” roofing not only avoids blisters, but also helps to remove moisture from the base material (about 1 kg / sq. M. Over the summer). The amount of removed moisture can be increased with a fixed cross-section of the air gap due to dressings applied to the roll material during its manufacture. With a “breathing” roof, its breaks over the joints and cracks of the base are completely excluded, since the deformations of the latter are not transmitted to the roofing carpet.

The disadvantage of a breathable roof is that it is difficult to locate the leak. If a gap appears in the roofing carpet, where water has entered, then it will spread through all air sinuses and, finding a loose joint at the base, will enter the interior of the building. The appearance of a leak on the ceiling will not mean that the roofing carpet is damaged exactly over this place, and it is not easy to find an actual leak.

“Breathable” roofing is necessary for the restoration of old roofing, as inside the old bitumen carpet, as a rule, there is always moisture, which must be allowed to escape. It is also necessary when working in winter on new concrete pavements, the humidity of which cannot be brought to the standard parameters..

When using “breathing” roofs in mass construction, it is necessary to develop roofing diagrams in the composition of roof projects, indicating the layout of layers and structures of nodes and abutments.

Partial gluing of the roof to the base can be done by applying for the lower layer:

• perforated material;
• ordinary material, glued with mastic, in the form of evenly distributed spots, continuous or intermittent stripes of mastic;
• deposited material in which the lower deposited layer is applied to the fabric in intermittent stripes

Breathing roof systems have been successfully used for a long time in Scandinavia, Germany, Belgium and other countries. When laying the material by melting or dissolving, in order to comply with the technology, it is necessary to pay attention to the fact that it has a sufficient thickness of the lower covering layer. The minimum required thickness should correspond to the dimensions of the unevenness (roughness) of the base screed.

The device of a roofing carpet made of materials with an adhesive layer is very technologically advanced. This method can be used both for new roofs and for repairing old ones, but the base must be prepared with great care. Today, such materials are rather rare for the Russian market and are used very limitedly.