Protected Membrane Roof Assembly
Protected roof membrane assembly prma popular in green roofing systems the protected roof membrane assembly prma places the insulation layer above the waterproofing membrane an inversion of traditional roofing systems.
Protected membrane roof assembly. The insulation is protected from environmental extremes but is exposed to moisture. 3 cap membrane field. Using standard ballast stone the water in the blue roof is stored within the void spaces of the stone and to the required level above the ballast. This arrangement of roofing materials roof deck waterproofing membrane moisture resistant insulation is commonly referred to today as the protected membrane roof pmr or insulated roof membrane assembly irma.
It is the simplest blue roof that can be created. A blue roof can be created on a typical hydrotech pmr protected membrane roof assembly utilizing standard loose stone for ballast. Protected and modified protected roof systems 1 general. To complete the installation of the waterproofing roofing assembly the separation protection course is installed such as hydrotech s hydroflex 10 for roofing applications or hydroflex 30 for waterproofing applications.
With such roofs the membrane s temperature range and rate of temperature change are drastically reduced. In a conventional roof assembly the roof membrane is on top of the insulation where it is subject to many. Filter mats specified must meet the insulation membrane manufacturer s specifications. This is done as the membrane is being installed so that a good bond is attained between them.