Roof Ventilation Requirements Building Regulations

Make sure your comply with flat roof building regulations.

Roof ventilation requirements building regulations.

The building regulations 2000 as amended england and wales. Building regulation in england for the ventilation requirements to maintain indoor air quality. In order to facilitate this exchange of warm and cool air the general rule of thumb suggests installing at least 1 sq. Requirement c2 a b c.

Otherwise ventilation is required and this is known as a cold roof system. The requirements will be met by the ventilation of those roofs where the moisture from the building can pass through the insulation. Ventilation openings shall have a least dimension of 1 16 inch 1 6 mm minimum and 1 4 inch 6 4 mm maximum. 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.

Swish ventilators for roof voids are covered by british board of agrément certificate no 91 2620. Of vent for every 300 sq. Proper attic ventilation can be an impor tant performance consideration when design ing and installing steep slope roof systems. Federal housing authority recommends a minimum of at least 1 square foot of attic ventilation evenly split between intake and exhaust for every 300 square feet of attic floor space.

Typically building codes include minimum requirements applicable to attic ventilation. Building codes vary. When ventilating a roof the air should be able to enter at one end and travel through to the other end where it can exit. 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.

These things will affect the timing cost and overall running of your project. Code requirements the international building code. Enter square footage calculate or enter the square footage of the attic or area to be vented. Sometimes the excitement of starting a new construction project or building venture can lead you to forget about the finer details such as planning permission and local building regulations.

Published 1 december 2010 from. Roofs with a pitch of 15 or more pitched roof spaces should have ventilation openings at eaves level to promote cross ventilation.