7 Best Of How Do You Insulate An Existing Flat Roof Free Download. Ventilation is necessary to allow moisture accumulated inside to escape. It is top quality and the most cost effective product for your flat roof.
For a 1 inch board equivalent of 6 r value. It is top quality and the most cost effective product for your flat roof. Install composite insulation made from expanded polystyrene or EPS.
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.
The typical U-value of an existing uninsulated flat roof is 15Wm2K. Cut each sheet to the desired size using a utility knife then fasten it in place using staples or adhesive. The insulation material is placed between the supporting joists leaving a gap of 50-60mm between the roof and insulation. Avoids nails or screws which could penetrate the metal roof and cause leaks.