Bitumen Roof Shrinkage

Roof shrinkage is no easy matter to deal with.

Bitumen roof shrinkage.

Shrinkage is most common on epdm or modified bitumen roofs. The shrinkage of the top surface is commonly due to normal aging and weathering of the shingle over the years. Methods recommended for preventing shrinkage include adhesion of the whole roofing system and peripheral attachment of the membrane to the deck. The more obvious sign of roof shrinkage are highly visible gaps running along the seams where the roofing surface rolls were initially laid out.

The installation process known as torch on roofing is often used on commercial. Its causes include aging of the material poor installation and uv exposure. While roof shrinkage technically involves parts of the roof shrinking to an extent it rarely makes your roof look visibly smaller. Shrinkage of a membrane often damages base flashings or the roof edge assembly leading to water infiltration.

It is most common on epdm or modified bitumen roofs and is usually caused by aging of the material poor installation or excessive uv exposure. The swelling of the underside of the shingle is commonly due to the migration of excessive amounts of airborne moisture from the attic spaces through the roof deck and into the bottom surface of the shingle. An organic felt or fiberglass mat saturated with asphalt and faced with granular stone aggregate. The material is based on the same materials used in asphalt shingles.