Slate Roof No Insulation

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.

Slate roof no insulation.

There s no insulation under there currently just the rafters and wood plank sheathing. Gable windows at at each end summer open winter closed. Similar system on first floor in the basement. The cellular glass is incompressible 100 fire safe and water resistant.

Then you will require insulation that is safe from the elements. 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. 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. Answered 14th jan 2013 like 2.

Duct work is r4 2 flex off of insulated main fixed duct. Duct work sitting on the floor. The space between the rafters is a bit haphazard because of the age and shape of the roof. If you want to insulate the sloping roof you definitely don t want to install spray foam against the back side of the slates.

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. It had no insulation whatsoever between the plaster and the outside roof. 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. Wet heating coil is fed from a basement boiler.

A well ventilated roof space is good this stops your timbers rotting. Foamglas offers complete safety and peace of mind.