How To Insulate An Old Slate Roof

Equally the reverse is true.

How to insulate an old slate roof.

An advantage of spray foam is it s quick whereas foam board needs to be cut and measured which can be a chore. 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. If you want to avoid internal changes you can do so by insulating externally. Plasterboard 50mm pur insulation in 50mm timber stud with 50mm vented cavity to the existing wall.

The best way is to insulate the attic floor. Answered 14th jan 2013 like 2. If you want to insulate the sloping roof you definitely don t want to install spray foam against the back side of the slates. To insulate the roof itself you either use spray foam or retrofit with it with rigid foam board.

U value 0 38w m. With an assumed pre existing u value of 2 23w m the best options are as follows. 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. A well ventilated roof space is good this stops your timbers rotting.