Roof Ventilation Requirements Scotland

Refer to guidance to standard 3 17 and oftec technical book 3 where an extract fan is fitted in a building containing an open flued combustion appliance.

Roof ventilation requirements scotland. The overall provision of trickle ventilation in a dwelling may be provided at an average of 11 000 mm2 per room with a minimum of 11 000 mm2 for each apartment. Section r806 roof ventilation r806 1 ventilation required enclosed attics and enclosed rafter spaces formed where ceilings are applied directly to the underside of roof rafters shall have cross ventilation for each separate space by ventilating openings protected against the entrance of rain or snow. Building regulations contain the technical requirements to protect the public interest. Extract rates should be reduced.

Select 100 is a classically styled bathroom extractor fan range designed to comply with current building regulations. Condensation encourages rot and mould growth. Pitched roof spaces should have ventilation openings at eaves level to promote cross ventilation. Technical handbooks for use from 1 october 2019.

Roofs with a pitch of 15 or more. A range of options and models are available including pull cord timer humidistat remote switch and selv extra low voltage. A new standard bs 8612 was released in february 2018 and sets out minimum performance requirements for dry fixed roofing systems in regards to fixing wind load resistance durability and ventilation according to bs 5250. We publish technical handbooks which explain how to achieve the requirements set out in the building scotland regulations 2004.

A roof void above an insulated ceiling. Enter square footage calculate or enter the square footage of the attic or area to be vented. 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. The wider the span the more free airflow is required in the roof space.

The requirements will be met by the ventilation of those roofs where the moisture from the building can pass through the insulation. 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. The air gap dimensions shown on the drawings are the minimum widths required for clear continuous ventilation air paths at the eaves. It applies to both new build and refurbished roofs.

Let owens corning roofing help you calculate exactly how much ventilation you will need for a healthy and balanced attic with our 4 step ventilation calculator.