Think of how much cooler it is under a canopy or tree than in the direct sun.
How to insulate a roof against heat.
Don t forget to insulate the loft hatch.
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.
This allows a lot of the heat to be reflected and dissipated before it even gets to the roof insulation.
Many homes have at least some access to this space and because of the size attics can hold quite a bit of insulation.
With a warm roof the usual process is to split the insulation into two layers.
This usually involves attaching a block of polystyrene insulation to its upper side and ensuring any gaps around the side of it are sealed by applying.