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.

The air gap dimensions shown on the drawings are the minimum widths required for clear continuous ventilation air paths at the eaves. 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 15 52 12 93. 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.

Add to wish list add to compare. Roof voids must be ventilated in order to stop warm air condensing on cold surfaces. The wider the span the more free airflow is required in the roof space. The answer depends on the type of roof you have.

How to ventilate your flat roofing system. A qualified roofing contractor will be able to advise on this but here are some of the main guidelines. It depends on where the insulation is installed. As low as 1 20 1 00.

Add to wish list add to compare. Condensation encourages rot and mould growth. As low as 25 20 21 00. Klober kg9856 in line flat vent.

A cold roof is the most common type of roof construction often taking the form of an uninhabited storage space. A cold roof or hot roof. 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. 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. How much ventilation does a flat roof need.