Cold Deck Flat Roof Insulation

This means there is a vapour control layer in the ceiling and cross ventilation at the eaves or the top of the walls.

Cold deck flat roof insulation.

This construction relies on a vapour control layer working effectively and in tandem with a continuous ventilated airspace to disperse the water vapour to atmosphere before it reaches the cold deck and condenses. Warm flat roof insulation. Saint gobain insulation uk manufacture and supply glass mineral wool slabs and rolls along with rigid polyisocyanurate pir boards that can be considered suitable for a wide range of applications across flat roofs whether you re looking to insulate at joist level or above the roof deck in your flat roof construction. Fortunately these days there is a better form of insulation available for your flat roof.

This method of insulation can also be used to upgrade the thermal performance of an existing roof without affecting the waterproofing system. Ventilation openings either at. The solution warm deck insulation. Lots of traditional flat roofs are of the cold roof construction type.

Warm roof insulation ensures the entire roof structure is insulated meaning a warm deck roof is more energy efficient than a cold roof. A cold roof has the insulation placed below the structural deck which thus remains cold. The layer of insulation is essentially placed outside of the roof. Where insulation depth is restricted by the flat roof construction it may be necessary to install the roof insulation between and below the joists to create a cold deck structure.

As for insulating below the joists an insulating laminate insulation bonded to plasterboard such as celotex pl4000 or a separate rigid pir insulation board finished with a separate sheet of plasterboard can be securely fixed to the joists to provide an internal finish to the roof. See our flat roof insulation solutions. Cold flat roof insulation. Cold deck flat roof the thickness of insulation required will vary depending on the material you decide to use and the manufacturer s specification.

A ventilation gap usually 50mm should be provided between the top of the insulation and underside of the roof covering to allow the air to flow across. This video shows the key features of a flat roof cold deck construction and how to draw the details to a scale of 1 10. Alternatively battens can be secured to the underside of the. This may help with condensation but causes such a loss of heat that it has been banned in scotland.

The breakdown warm roof vs cold roof a cold flat roof insulation requires more work taking off old boards and replacing them and the roof surface.