Insulation Slate Roof

Insulation laid so that it covers the eaves significantly reduces ventilation to the roof.

Insulation slate roof.

Where the felt is impervious any contact condensation will run down the felt and make the insulation damp. Ice water shield. Slate is a wonderful forgiving roofing. A well ventilated roof space is good this stops your timbers rotting.

If you want to insulate the sloping roof you definitely don t want to install spray foam against the back side of the slates. The underside of the roof sheathing will dry rapidly to the exterior through the slate due to ventilation drying and diffusion. Answered 14th jan 2013 like 2. The materials used to insulate under the roof include batts of mineral or glass wool insulation held in place by battens of wood attached to and across the rafters alternatively polystyrene.

Insulation is often laid in contact with the roofing felt. Read about how to install starter courses take a look at common contractor errors watch some video clips read about drip edges and cant strips if necessary look at some of the nuances that may be pertinent to your installation such as cleats on aprons cleats on. Check the depth between your trusses and the slates then install the correct thickness of kingspan in the gaps allowing for a 25mm air gap between the kingspan and the slates. 3 before you start do your homework.

You would first have to create a vent channel under the slates by installing 1x1 sticks at the top of each rafter bay followed by stiff material like rigid foam or plywood.