How To Insulate A Roof Against Heat
Another best practice is to have a vented air cavity directly under the roof.
How to insulate a roof against heat. With a warm roof the usual process is to split the insulation into two layers. 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. Don t forget to insulate the loft hatch.
Like a canopy a vented roof basically shades the rest of the house. 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.