Cold Deck Flat Roof Insulation

This system is called warm deck insulation and eradicates the condensation and venting issues associated with the cold deck system.

Cold deck flat roof insulation. 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. See our flat roof insulation solutions. 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. This method of insulation can also be used to upgrade the thermal performance of an existing roof without affecting the waterproofing system.

Alternatively battens can be secured to the underside of the. In this way the roof itself is kept cold. You only need ventilation in a cold roof. 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.

The solution warm deck insulation. Ventilation openings either at. Refurbishing an existing timber joisted flat roof which has no insulation. 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 is where all of the insulation is placed either between and under or completely under the joists or deck. A cold flat roof is one where the insulation is between or between and below the roof joists. Cold deck flat roof the thickness of insulation required will vary depending on the material you decide to use and the manufacturer s specification. 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.

The insulation is below the deck but above the plasterboard. 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 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. Fortunately these days there is a better form of insulation available for your flat roof.

No insulation is on top. 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. The layer of insulation is essentially placed outside of the roof.