Is Fibreglass (GRP) Flat Roofing Insulated?
Insulation can be added to the roof in the form of:
- Between joist – using 100mm rigid board insulation, or classic rockwool type insulation. This method would require the installation of vents, which can be installed easily by us, at very little cost.
- Over original deck – This method is achieved by laying 100mm rigid board insulation over the existing timber deck (old covering is removed first). The new 18mm OSB deck is then applied over the insulation boards and screwed into the joists with 150mm screws. We recommend that you consider renewing your fascia boards (which we can do for you at little cost) when installing a warm roof. This is because the roof deck height is raised by 100mm and would leave the foam insulation visible if not covered by a larger or raised fascia board