Cold Flat Roof Ventilation Requirements

Ventilation for cold roofs.

Cold flat roof ventilation requirements.

A qualified roofing contractor will be able to advise on this but here are some of the main guidelines. Duo pitch roofs greater than 200 pitch or greater than 10m span should have additional ventilation at the ridge to assist airflow through the roof void equivalent to at least a 3 mm wide continuous gap. As low as 25 20 21 00. The answer depends on the type of roof you have.

Any type of roof from tpo to epdm can be either hot or cold. Klober kg9856 in line flat vent. 2011 code of practice for control of condensation in buildings stipulates that there should be a ventilation gap between the insulation and the bottom of the flat roof deck of at least 50mm. A cold roof is the most common type of roof construction often taking the form of an uninhabited storage space.

In a concrete deck for example this gap could be created by fixing 50x50mm timber battens at 600mm centres and attaching the insulation to underside of these battens. It depends on where the insulation is installed. Add to wish list add to compare. There must be a slope of 1 80 part h of the building regulations regarding drainage state that water should drain to one or two edges waterproofing should extend up the adjacent walls at least.

As low as 15 52 12 93. Til r pitched roof insulation board. As low as 1 20 1 00. Roof voids must be ventilated in order to stop warm air condensing on cold surfaces.

Condensation encourages rot and mould growth. How much ventilation does a flat roof need. The wider the span the more free airflow is required in the roof space. The air gap dimensions shown on the drawings are the minimum widths required for clear continuous ventilation air paths at the eaves.

The minimum requirements for cold roof ventilation are set out in bs 5250 control of condensation in buildings which takes into consideration span pitch and roof area. Effective cold roof ventilation.