Protected Membrane Roof Building Science

Each 2 x 4 lightguard heavyguard or coolguard pmr insulation panel utilizes the superior.

Protected membrane roof building science.

This insulation can be placed above the roof membrane protecting the membrane from elements while continuing to deliver thermal efficiency. A conventional roof system. Fully adhered alas directly on the structural deck and the thermal control layer and ballast are located above. 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.

Soviet era protected membrane roof pmr. Protected membrane roofing insulation technology has evolved over the decades and some types like rigid extruded polystyrene foam xps is highly water resistant. 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. Membrane roofs are predominately used as a flat roofing system since they are watertight which is critical where water is not shed immediately.

Clear protected membrane roof system pmr the dow styrofoam extruded polystyrene insulation is placed above the waterproof membrane to protect the membrane from the harsh rooftop environment. 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.