Cold Flat Roof Ventilation Requirements

The answer depends on the type of roof you have.

Cold flat roof ventilation requirements. 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. A cold roof is the most common type of roof construction often taking the form of an uninhabited storage space. It depends on where the insulation is installed.

How much ventilation does a flat roof need. As low as 25 20 21 00. Condensation encourages rot and mould growth. The wider the span the more free airflow is required in the roof space.

Klober kg9856 in line flat vent. As low as 15 52 12 93. 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. Any type of roof from tpo to epdm can be either hot or cold.

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. As low as 1 20 1 00. A cold roof or hot roof. Ventilation for cold roofs.

Add to wish list add to compare. Roof voids must be ventilated in order to stop warm air condensing on cold surfaces. 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. Effective cold roof ventilation.

Til r pitched roof insulation board. A qualified roofing contractor will be able to advise on this but here are some of the main guidelines.