Flat concrete roof with suspended ceiling - CR013a

ProctorWrap IRMAInsulation for flat concrete roof

Dow Styrofoam RTM-X or Dow Roofmate SL-X


Download CAD DWG

Download CAD PDF

Ensure membrane is clean and free of loose material.

Lay insulation boards in brick pattern with square edges pushed together firmly, cut neatly around penetrations and extended up upstands.

Separation layer
Lay ProctorWrap IRMA over insulation with edges lapped 300mm and turned down at upstands and penetrations.

Dow Styrofoam RTM-X or DOW Roofmate SL-X

Total R-Value

Above Slab R-Value

Roofs with insulating membrane protection are also known as IRMA (inverted roof membrane assembly) or PMR (protective membrane roof). 

Specify separation layer in the Waterproofing - external and tanking worksection, or delete if not required.

Using Dow Styrofoam RTM-X above the slab will minimise the risk of condensation below the slab. Care, should be taken in allowing builders to remove insulation above the slab as condensation may result in toxic mould formation. [Size] – Determined by required material R-value and k-value. In a ventilated space, the reflective foil values are diminished.

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