Roof leaks from corrugated board: the best sealing of joints, corrugated seams

Sealing the joints and seams of the roof is an important step in the installation of the roof. Roof leaks occur, destroying supporting structures and causing other problems.

A roof made of corrugated board is popular because the price of the material is low. Installation can be done independently. But it is important to know about the important points. For example, about sealing joints. It is necessary to pay special attention to the places where the wall adjoins the roof, the chimney to the corrugated board. Leaks often occur in the valleys.

Gutter systems also require sealing.

Typically, sealants, seals and tapes are used for sealing.

Thiokol sealant is made from bitumen. It serves for several decades, withstands temperatures from +145 to -40 degrees. Cons: hardens for a long time, it needs to be applied in several thin layers, weak elasticity.

Do not use acrylic corrugated roofing sealant. It is not durable and literally in 2-4 years it will begin to crumble and crack.

Polyurethane sealant also has disadvantages: it is afraid of ultraviolet radiation, crumbles over time. Therefore, they are used only in places where the sun's rays do not pass. In addition, birds love this foam.

There are two-component polyurethane-based sealants on the market. They do not have the above disadvantages, but are difficult to use. In addition, they are expensive and release toxic substances.

Butyl rubber tape is increasingly used for corrugated boarding. The tape is available in various lengths and widths.

Can be used for chimneys. It has high adhesion to building polymers. There are liquid formulations that have even greater adhesion and are easy to work with. For example, TechnoNICOL butyl rubber sealant.

Another option for waterproofing - waterproofing and fiberglass. First, the joints and seams are treated with waterproofing, and then fiberglass is applied. Then another layer of waterproofing and sand on top for strength.

Most a good decision, a universal composition for sealing roof joints, is a silicone sealant.

It is suitable for almost all roofing materials. Elastic, able to withstand large temperature drops, resistant to ultraviolet. For sealing the profiled sheet, such a sealant will be the best solution. But it should be applied on a dry surface with a layer about 3mm thick.

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