How To Insulate An Old Slate Roof

Equally the reverse is true.

How to insulate an old slate roof.

To insulate the roof itself you either use spray foam or retrofit with it with rigid foam board. 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. An advantage of spray foam is it s quick whereas foam board needs to be cut and measured which can be a chore. The best way is to insulate the attic floor.

U value 0 38w m. If you want to avoid internal changes you can do so by insulating externally. With a warm roof the usual process is to split the insulation into two layers. With an assumed pre existing u value of 2 23w m the best options are as follows.

Answered 14th jan 2013 like 2. A well ventilated roof space is good this stops your timbers rotting. If 180mm is to be installed then 100mm board might be introduced between the rafters there has to be a minimum 25mm air gap between the insulation and the underside of the tiles or slates with an 80mm board running across the rafters. 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.