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.

A cold roof is where all of the insulation is placed either between and under or completely under the joists or deck. Warm roof insulation ensures the entire roof structure is insulated meaning a warm deck roof is more energy efficient than a cold roof. Cold roofs by the way are not recommended for high humidity areas see the blog on how to insulate roofs of. A cold roof has the insulation placed below the structural deck which thus remains cold.

This is used for refurbishment e g. The insulation is below the deck but above the plasterboard. 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. 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.

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. You only need ventilation in a cold roof. Fortunately these days there is a better form of insulation available for your flat roof. Refurbishing an existing timber joisted flat roof which has no insulation.

Ventilation openings either at. The solution warm deck insulation. A cold flat roof is one where the insulation is between or between and below the roof joists. 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. See our flat roof insulation solutions. No insulation is on top. 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.

The layer of insulation is essentially placed outside of the roof. In this way the roof itself is kept cold. 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.