One of the major problems in new buildings compared to asphalt shingle roofsit is the tearing of the shingles by the wind. In fact, two malfunctions can cause wind shearing of asphalt shingles:
- Nail-related deficiency (poorly inserted nails, missing or not installed in the right place);
- The lack of adhesion of asphalt shingles.
Generally, the improper installation of asphalt shingles involves a inadequate nailing and poor adhesion between shingles. This improper installation can cause the shingles to be blown off by the wind. In a lesser case, tearing shingles can occur.
Regarding the improper installation of the shingle roofasphalt, sometimes we find the following points:
- Nails that are curved and too deep. These must be laid straight and fully recessed, without being embedded in the membrane to prevent perforation or weakening of the shingle. In general, in the case where there is tearing, it is found that the nails are crooked, insufficient and too deep. The nail heads should be flush with the surface of the shingles (ie at the same level). Moreover, projecting nails can deform the shingles and prevent them from sticking together, by lack of contact between the surfaces to be bonded.
- Le lack of nails on the shingles because, occasionally, there are only three (3) nails per shingle. Sometimes there are four (4) nails per shingle, but no nail at the edge of shingles.
- It also happens that nails are driven far from the nailing line. In this way, they do not cross the shingles that are located below. In attic roofs, very often, there are not six (6) nails per shingle (instead of four) as recommended by the rules of the art.
- He may miss hill between the flashings that overhang the roof and asphalt shingles as well as nail heads. These flashings must be glued with all-purpose asphalt plastic cement and sealed with exposed nail heads.
Asphalt shingles must be sound and remain intact to seal a roof. Proper installation of asphalt shingles is essential to avoid problems of water infiltration and frequent repairs.