Slate Roof No Insulation

There s no insulation under there currently just the rafters and wood plank sheathing.

Slate roof no insulation.

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 space between the rafters is a bit haphazard because of the age and shape of the roof. Rafters have no insulation under slate. 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.

I am left with from the outside inwards slates nailed onto planks about a foot wide and half inch thick nailed onto the rafters which are about 10 inches by 3 inches. Duct work sitting on the floor. Looking to build a curved or pitched timber structure with slate roofing. I was considering spray foam but i ve done some research and it seems the underside of the slate tiles need to breathe to get rid of moisture that would otherwise accumulate in the rafters and cause rot.

Roofing felt was introduced primarily to act as a secondary barrier against wind driven snow and rain but its use also causes a reduction in air movement within the roof space particularly if the roofing felt is impervious and this effect is often compounded by the introduction of insulation. Similar system on first floor in the basement. 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. The cellular glass is incompressible 100 fire safe and water resistant.

Foamglas offers complete safety and peace of mind. Duct work is r4 2 flex off of insulated main fixed duct. It had no insulation whatsoever between the plaster and the outside roof. Then you will require insulation that is safe from the elements.

Gable windows at at each end summer open winter closed. Wet heating coil is fed from a basement boiler.