Permaguard-F sand surfaced bitumen membrane is the standard protection layer. It is applied directly to the second coat of Permatec whilst it is still hot and tacky. It is used on the main horizontal area which is to be subsequently covered with a range of system components such as insulation, separation layer and loading coat (stone ballast, concrete paving etc). It is also used on unexposed detail items. The Permaguard-F protection layer should be rolled into the hot Permatec as quickly as possible. Laps in Permaguard-F to be minimum 75mm and sealed using hot Permatec compound.
Permaguard-M slate surfaced bitumen membrane is used on exposed upstand details. It is applied to the second coat of Permatec by controlled torch application. Laps in Permaguard-M to be minimum 75mm and fully sealed.
Rainwater outlets and penetrations in the roof waterproofing system should be detailed in accordance with Permatec Standard Drawings and Masterspec 4414AP specification.
A standard Permatec inverted roof system will include a range of system components including: XPS insulation (thickness in accordance to “R” values requirements), water control layer and loading coat (stone ballast or concrete paving).