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.
Slate roof no insulation.
Rafters have no insulation under slate.
Similar system on first floor in the basement.
There s no insulation under there currently just the rafters and wood plank sheathing.
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.
Gable windows at at each end summer open winter closed.
It had no insulation whatsoever between the plaster and the outside roof.
Foamglas offers complete safety and peace of mind.
Duct work sitting on the floor.
Wet heating coil is fed from a basement boiler.
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.
Looking to build a curved or pitched timber structure with slate roofing.
The cellular glass is incompressible 100 fire safe and water resistant.
Duct work is r4 2 flex off of insulated main fixed duct.
Answered 14th jan 2013 like 2.
A well ventilated roof space is good this stops your timbers rotting.
Roof is the original slate from 1930 on boards.
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.