Cold Roof Ventilation Gap

Building regulations state that a ventilation gap of at least 50mm must be in place between the insulation and the underside of the flat roof deck.

Cold roof ventilation gap.

For both a warm and cold flat roof a vapour control layer must be installed. Large cold pitched roof voids can be used to locate services such as water storage tanks associated pipes ventilation ducts electrical cables and recessed light fittings. Ventilation is required for these roofs. Cold deck roof a cold deck roof is where the insulation is placed between the joists rafters or in between the ceiling joists in the case of a pitch roof.

You only need ventilation in a cold roof. Continuous ventilation openings are made at the top and bottom. Ventilation at the eaves. Roof voids must be ventilated in order to stop warm air condensing on cold surfaces.

Ventilation is not needed in a warm roof. In this way the roof itself is kept cold. Where this is the case all gaps and holes around service that pass into the cold roof via the ceiling should be sealed to restrict the amount of water vapour that. Introduction warm cold roofs this guidance offers guidance on the difference benefits between warm and cold roofs.

A cold roof is where all of the insulation is placed either between and under or completely under the joists or deck. The air gap dimensions shown on the drawings are the minimum widths required for clear continuous ventilation air paths at the eaves. Effective attic ventilation systems reduce damaging heat and moisture in your attic promote energy efficiency by helping to reduce the load on your air conditioner in the summer and also reduce the risk of ice dam formation on your roof. The intent of roof venting varies depending on climate but it is the same if you re venting the entire attic or if you re venting only the roof deck.

Condensation encourages rot and mould growth. No insulation is on top. See the benefits of attic ventilation a new roof is more than just shingles. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.