u/Adorable_Elevator_61

Two submission, one elastomere one TPO. The first one is about 10k more. They say TPO makes wood rot. Are they trying to mislead us. See their message: To answer your questions, we do not install TPO membranes because it is a product intended only for commercial projects with a concrete deck, vapor barrier, 6.5 inches of compressed insulation, and TPO. In that type of system, it can last between 20 and 40 years without problems. However, when a TPO membrane is installed over a wood deck, the membrane will cause condensation, and within about 5 years the wooden deck will start molding underneath. We remove around 20 TPO roofs per year where people were misled.