Cold Flat Roof Ventilation Requirements

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.

Cold flat roof ventilation requirements.

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 25 20 21 00. Ventilation for cold roofs. Effective cold roof ventilation.

Condensation encourages rot and mould growth. The air gap dimensions shown on the drawings are the minimum widths required for clear continuous ventilation air paths at the eaves. 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. The answer depends on the type of roof you have.

How to ventilate your flat roofing system. Add to wish list add to compare. It depends on where the insulation is installed. Til r pitched roof insulation board.

How much ventilation does a flat roof need. A cold roof or hot roof. A qualified roofing contractor will be able to advise on this but here are some of the main guidelines. Roof voids must be ventilated in order to stop warm air condensing on cold surfaces.

A cold roof is the most common type of roof construction often taking the form of an uninhabited storage space. 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. Add to wish list add to compare. Klober kg9856 in line flat vent.

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. Any type of roof from tpo to epdm can be either hot or cold.