Protected Membrane Roof Building Science

For the newbies pmr stands for protected membrane roof and irma stands for inverted roof membrane assembly in these roofs the water control layer is not always.

Protected membrane roof building science.

By overlaying the membrane with opaque ballast and thermal insulation the membrane is protected against accelerated oxidation evaporation of volatile oils ultraviolet degradation of organic materials such as bitumen thermal movement expansion and contraction blistering ridging and stress concentration over insulation joints. A conventional roof places the membrane on top of the insulation leaving the mem brane vulnerable to extreme temperature changes freeze thaw conditions and physical abuse from heavy foot traffic figure 1. The pmr system places the insulation on top of the mem brane protecting the roofing. A conventional roof system.

Each 2 x 4 lightguard heavyguard or coolguard pmr insulation panel utilizes the superior. In protected membrane roof pmr systems. Membrane roofing is a roof system that creates a continuous watertight covering to protect the interior of a building. Membrane roofs are predominately used as a flat roofing system since they are watertight which is critical where water is not shed immediately.

Protected membrane roofing insulation technology has evolved over the decades and some types like rigid extruded polystyrene foam xps is highly water resistant. Soviet era protected membrane roof pmr.