Roof Ventilation Requirements Scotland

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Roof ventilation requirements scotland.

Select 100 is a classically styled bathroom extractor fan range designed to comply with current building regulations. The wider the span the more free airflow is required in the roof space. A roof void above an insulated ceiling. Technical handbooks for use from 1 october 2019.

Extract rates should be reduced. We regularly consult with industry to review our guidance. Building regulations contain the technical requirements to protect the public interest. Pitched roof spaces should have ventilation openings at eaves level to promote cross ventilation.

The air gap dimensions shown on the drawings are the minimum widths required for clear continuous ventilation air paths at the eaves. 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. Condensation encourages rot and mould growth. Roofs with a pitch of 15 or more.

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. We publish technical handbooks which explain how to achieve the requirements set out in the building scotland regulations 2004. The requirements will be met by the ventilation of those roofs where the moisture from the building can pass through the insulation. 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.

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. This guidance page gives you a broad view of the requirements for using the roof space in dwellings and if more detailed information is required it is necessary to refer to the technical handbook and the building standards scotland regulations. 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. Enter square footage calculate or enter the square footage of the attic or area to be vented.

Roof voids must be ventilated in order to stop warm air condensing on cold surfaces.