Insulation Slate Roof

Answered 14th jan 2013 like 2.

Insulation slate roof.

Understand headlap read about the common mistakes people make when installing slate roofs. It is vapor permeable and air leaky. Ice water shield. 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.

If you create an air space under the roof sheathing boards as dana suggests there is no need to have any soffit vents or ridge vent. Where the felt is impervious any contact condensation will run down the felt and make the insulation damp. Slate is a wonderful forgiving roofing. If you want to insulate the sloping roof you definitely don t want to install spray foam against the back side of the slates.

Insulation is often laid in contact with the roofing felt. Insulation laid so that it covers the eaves significantly reduces ventilation to the roof. 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. 3 before you start do your homework.

A well ventilated roof space is good this stops your timbers rotting.