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 roof membrane assembly.
By simply reversing the insulation and the waterproofing membrane insulation on top of the membrane rather than beneath the cause of many roofing problems can be eliminated.
To complete the installation of the waterproofing roofing assembly the separation protection course is installed such as hydrotech s poly 500 or hydroflex 30 for waterproofing applications.
Filter mats specified must meet the insulation membrane manufacturer s specifications.
In this protected environment the roof membrane is shielded from physical damage extremes in temperature and temperature cycling high vapour pressure and the detrimental effects of the environment which often leads to premature failure and high maintenance.
Protected membrane roofing installation typical installation the following depicts the typical steps necessary to install hydrotech s monolithic membrane 6125 waterproofing roofing membrane assembly.
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.
Protected and modified protected roof systems 1 general.
In a conventional roof assembly the roof membrane is on top of the insulation where it is subject to many.
The natural water resistance of foamular eps and xps minimizes water absorption preserving r value.
One of the advantages of using mm6125 in a protected membrane roof assembly pmr is that once the membrane is installed owners and designers can take advantage of various ballast options gravel pavers and garden roof to suit a specific project s needs.
In fact since mm6125 is keeping the structure watertight and monolithically applied directly to the deck design professionals can combine ballast assemblies with confidence knowing that drainage.
A horizontal poured in place concrete substrate.
This approach is commonly referred to as a insulated roof membrane assembly irma or protected membrane roof pmr.
Protected membrane roof systems.
A pmra begins with the application of the epdm membrane followed by the xps boards the protective scrim and finally the ballast.
This is done as the membrane is being installed so that a good bond is attained between them.
The protected membrane roof pmr assembly places the membrane under the insulation.
In an irma the system s insulation is installed above the waterproofing membrane instead of below as in a conventional roof assembly.
This is intended to be only an illustration and must not be considered a suitable guideline governing the installation of the products.
06 13 2007 by richard l.
Inverted roof systems are also referred to as upside down roof assembly.
A protected roof membrane assembly pmra differs from a conventional roof design in that the membrane is placed under the insulation layer maximizing membrane life by protecting it from temperature extremes freeze thaw cycles uv degradation and traffic wear.
