Various materials are used for roof repair, ranging from bitumen mastic to create a seamless roofing carpet to a high-strength sealant used to seal metal roofs.
Adhesives for sealing
Adhesives for roof repair sealing are used in the construction of both flat and pitched roofs. They are used for sealing joints between sheets, canvases, and various elements of roofing. Additionally, they can be used to eliminate cracks when laying materials near chimneys, gutters, vents, and other communications.
Conventionally, adhesives for sealing joints can be divided into the following types:
- Sealing tapes are the most affordable solution to eliminate cracks, punctures, damage, and other flaws in the surface of the roofing. It is a bituminous tape that is glued along the entire length of the joint. Differs in ease of use and resistance to low temperatures;
- silicone sealant – available in different packages. For routine roof repair, the sealant is usually used in gun tubes. When performing capital work, a composition is used to work with spray equipment. Silicone sealant is versatile and resistant to temperature fluctuations;
- acrylic compounds – in composition and method of work, they are similar to silicone sealants but have a lower cost. Acrylic sealants are practically odorless, perfectly applied, and distributed over any surface. The only negative is that the composition can be applied only on a completely dry surface;
- polyurethane mixtures – viscous and viscous compositions for the roof repair of any surface. They are characterized by resistance to low temperatures, mechanical stress, and moisture. Easy to apply and set quickly. During work, safety precautions should be observed, since polyurethane mixtures are very toxic;
- two-component formulations – rubber-based adhesive mixtures. They consist of an adhesive and a hardener, which are mixed before application. They are distinguished by their versatility, the ability to use in various temperature conditions, as well as excellent adhesion to metal, brick, wood, and other surfaces.
Roof repair mastic
Bituminous mastic is a viscous plastic mass consisting of fine fillers and special additives, rubber, various resins, and plasticizers. It is used both for waterproofing various surfaces and for constructing full-fledged roofs. For example, for sealing flat roofs for technical and storage rooms.
Depending on the composition, bituminous mastic is divided into the following types:
- cold mastic is a one-component composition already ready for use. If necessary, the mastic can be diluted with organic solvents. Some manufacturers produce compositions that are heated to a temperature of 30-40
- hot mastic – before application requires heating up to 150-180 o C. Immediately after mixing, the bitumen mixture is applied and evenly distributed over the working surface. When cooling down, the mastic penetrates into the pores of the treated material, thereby protecting it from the destructive effects of moisture;
- Water-based mastic is the most environmentally friendly and safe material for liquid roof waterproofing. The mastic contains only natural ingredients, which do not emit harmful substances when heated.
Any bituminous mastic allows you to create a seamless monolithic roofing sheet that reliably protects the roof structure and interior spaces from dampness and moisture. In addition, mastics are ideal for local roof repair of bituminous flat roofs.
Among the disadvantages of these compositions, it can be noted that roof repair work is possible only on a sunny day when the probability of precipitation is minimal. In addition, in the absence of work experience, it will be quite difficult to control the thickness of the bitumen layer, which can affect the final result.
Metal roof sealant
For the roof repair of metal roofs, a sealant based on bitumen or silicone is used. It is a waterproof bitumen elastomer compound that can be used even in humid conditions. The composition is resistant to ultraviolet rays and can be applied at low temperatures down to -35 to C, and at high heating to temperatures above 100 to S.
Other advantages of this sealant include:
- excellent adhesion to most materials used for roofing;
- ease of application – the composition does not spread, does not drip, and easily penetrates even into small cracks;
- environmental friendliness – bitumen sealant does not contain asbestos and other highly toxic substances
There are several limitations when working with this type of sealant, which is usually indicated on the packaging. For example, after application, the sealant must not be painted over with paint based on organic solvents. It is also not recommended to use it in conjunction with foam insulation, which is often used for thermal insulation of roofs.
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