If you want to insulate the sloping roof you definitely don t want to install spray foam against the back side of the slates.
Slate roof insulation.
Slate roofs national slate association 1926.
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.
A slate roof can cost from 12 to 40 per square foot according to websites and roofers i consulted.
Asphalt shingles are a good basic go to with a relatively low initial.
Http www spraysealroofinsulation co uk spray foam insulation being applied to the underside of a slate roof.
Thicker slates are ok to be drilled as there is usually room between them for a nail head.
Slate roofs national slate association 1926.
Slate roofing 3 8 inch slates.
Depending on what roof type you choose for your structure you may be using roof tiles ridge caps roofing sheets underlayment and roof insulation.
For people who do not plan to ever sell their home the incredible longevity of slate is a highly desirable benefit.
With a warm roof the usual process is to split the insulation into two layers.
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.
A slate roof will easily last over 100 years which is at least double of what other roofing materials can offer.
Many slate tile manufacturers offer up to 100 year warranty on their products.
There are different types of roof shingles roof tiles and paneling some more decorative and others more functional.
A well ventilated roof space is good this stops your timbers rotting.
The best way is to insulate the attic floor.
Slate roofing 3 16 inch slates.
Your price will be on the lower end if you use recycled slates or reinstall your own.
After installation the nail heads will rub against the overlying slates and eventually wear holes in them.
Answered 14th jan 2013 like 2.
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.
Standard thickness roofing slates 3 16 inch to 1 4 inch that have drilled holes without counter sinking are sub standard slates.