How are shingles or metal roof coverings applied to Murus roof SIPs?
It depends upon which type of roof finish material will be used. Ultimately, installation details and technical information on the specific roofing product should be verified through the product manufacturer. Shingles: Not all shingle manufacturers warrant shingles applied directly over an insulated deck or SIPs. Depending on your choice of manufacturer, an additional ventilated space may be required for warranty qualification. The preferred and recommended method of shingle installation is on an elevated, ventilated surface. Furring strips or strapping are screwed vertically over a layer of roofing felt to the exterior surface of the roof panel on 16″ to 24″ centers. A layer of sheathing material is applied on the strapping as the nail base for the shingles. This system requires both eave and ridge vents to vent the cavity and prevent condensation and heat buildup. Metal: For metal roof applications, an additional layer of strapping, installed horizontally, can be used in lieu of the
