PMMA is a two-part polymethyl methacrylate based acrylic resin that was first developed in Germany in 1928 as a thermoplastic known as Plexiglas.
The hydrophobic characteristics of PMMA molecules repel water by nature. This unique characteristic makes a PMMA membrane well suited for roofs with ponding water.
Many flat or near flat roofs allow water to stand for long periods of time. Standing water accelerates the aging process of traditional roofing membranes and will void the manufacturer’s material warranty.
PMMA is chemically resistant to most acids and aqueous alkalis. In other words, unlike traditional membranes, bird droppings, vegetable fat, and animal fats will have little effect on a PMMA membrane. This degree of chemical resistance allows a PMMA system to succeed where other roofing products could fail. PMMA membranes are monolithic and extremely tough. They resist static and dynamic loads, and withstand equipment being placed directly on them.
PMMA membranes can be reinforced with polyester fleece, creating a seamless self-terminating roof membrane that does not require other flashings. Non-reinforced PMMA membranes can be applied over top of existing roof membranes, creating a long-term, highly durable roof coating.
The higher costs associated with the installation of a PMMA system may preclude it from some roofs, but its ability to solve difficult problems might make it the least expensive option.