Insulating A Flat Roof From Outside

This is then covered with a further weatherproofing layer.

Insulating a flat roof from outside.

Whatever new flat roof covering you choose epdm rubber kemper. Unfortunately too many dwellings suffer from this problem. The material that works best depends largely upon preference in a given situation. Materials used to make insulation in these three types include mineral wool fiberglass cellulose fiber vermiculite styrofoam polystyrene and polyurethane.

The insulation material is placed between the supporting joists leaving a gap of 50 60mm between the roof and insulation. Not cheap but needs to be done right either way. However most cathedral ceilings and low slope flat roofs are insulated roof assemblies. I explain problems with insulating a roof using the warm and cold roof construction methods.

Rigid foam panels are available in thickness. Many properties use this option as there are no additional costs for scaffolding or organising how to gain safe access to the roof exterior. Fur down the rafters for more r value after evaluation air seal insulate and control the vapor diffusion. Warm deck flat roof insulation is now the standard way to insulate a flat roof click to enlarge flat roofs for example on extensions bathrooms and dormer windows are not the best of ideas.

Or insulate partially on the exterior side of the roof sheathing with an air control layer insulate in the rafters bays control the vapor diffusion and re work the fascia soffit etc. You would only do this however if replacing the roof covering on top and you have the height above the roof to do this. When you have an un insulated roof you have to live with. Like other roofs insulating a flat one requires ample ventilation a vapor barrier and sealed bypasses.

Use rigid foam insulation panels on your flat roof before applying the final roof covering or inside the house before adding sheetrock or paneling. A roof over a vented unconditioned attic does not need to include any insulation. The correct method for a flat roof is under the current regulations to have a warm roof. Why its important to insulate your flat roof.

Insulated roof assemblies can be vented or unvented. With this kind of roof the insulation follows the slope of the roof. In a nutshell you would sandwich 130mm of solid insulation between two decks allowing to place a vapour barrier on top of the first deck. Cold roof systems are highly inadvisable as insulation from the inside will inevitably lead to the formation of condensation.

Cold roof a very bad idea. They lose loads of heat and are prone to leaking causing the materials to deteriorate.