There are many roofing membrane options in the market, including thermoplastic membranes (PVC, TPO and KEE), rubber ethylene propylene diene monomer (EPDM), and modified bitumen. These membranes have seams, which can be attached using glue, tape, asphalt, or a heat welder. However, if both faces of the seam are not sealed at once, it will be defective no matter what adhesion method you use.
In today’s article, Genesis Roofing, a professional roofing company in Clive, IA, explains why some roof membranes fail at the seams.
What Kind of Seam Sealing Method Does Your Roof Have?
Seams are the weakest point of any portion of a membrane roof. The method of sealing the seams depends on the type of roofing system. For instance, thermoplastic membranes are sealed by heating the membrane with hot air until it melts and combines with the next section. Rubber EPDM roofs, meanwhile, are sealed either with adhesives or sealant tubes. Modified bitumen roofs are sealed by mopping hot asphalt or applying cold adhesive to the seam.
Why Do Roof Membranes Fail?
It’s important to hire a licensed roofing contractor to seal your roofing membranes. Otherwise, poor workmanship can lead to early roof damage. Membrane seams may overlap, but take note that it does not mean they are sealed. Additionally, wrinkles in the membrane during installation can cause voids in the flashing seams.
Aside from improper installation, extreme weather conditions can also be a problem. Rain, hail, snow, and everything that a roof must withstand can lead to roof shrinkage and brittleness. Eventually, this will damage your roofing membrane. In addition to that, you need to keep an eye on poor insulation. Remember that insulation needs to be secured to the roof. If it’s not, it will warp and create a hump under the membrane. This will pull on the seams and cause tears in various areas.
To prevent seam failure, turn to Genesis Roofing for your roof replacement services! We install built-up and single-ply roofing systems, as well as provide annual maintenance programs. Give us a call at (515) 202-1667 or fill out our online contact form to schedule an appointment.