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. Proper attic ventilation consists of a balance between air intake at your eaves soffits or fascias and air exhaust at or near your roof ridge. Enter square footage calculate or enter the square footage of the attic or area to be vented.

Otherwise ventilation is required and this is known as a cold roof system. 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. 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 roofing industry also has practical guide lines for attic ventilation.

Published 1 december 2010 from. 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. 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.

Roofs with a pitch of 15 or more pitched roof spaces should have ventilation openings at eaves level to promote cross ventilation. These things will affect the timing cost and overall running of your project. 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. Building codes vary.

Of vent for every 300 sq. The requirements will be met by the ventilation of those roofs where the moisture from the building can pass through the insulation. 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. Proper attic ventilation can be an impor tant performance consideration when design ing and installing steep slope roof systems.

Typically building codes include minimum requirements applicable to attic ventilation. When used in accordance with the certificate swish ventilators will satisfy the following statutory requirements.