Roof Ventilation Requirements Building Regulations

Building regulation in england for the ventilation requirements to maintain indoor air quality.

Roof ventilation requirements building regulations.

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. Ventilation openings shall have a least dimension of 1 16 inch 1 6 mm minimum and 1 4 inch 6 4 mm maximum. Requirement c2 a b c.

Published 1 december 2010 from. 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. 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.

Of vent for every 300 sq. Otherwise ventilation is required and this is known as a cold roof system. The building regulations 2000 as amended england and wales. In order to facilitate this exchange of warm and cool air the general rule of thumb suggests installing at least 1 sq.

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. Typically building codes include minimum requirements applicable to attic ventilation. Swish ventilators for roof voids are covered by british board of agrément certificate no 91 2620. The requirements will be met by the ventilation of those roofs where the moisture from the building can pass through the insulation.

Proper attic ventilation can be an impor tant performance consideration when design ing and installing steep slope roof systems. 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. Enter square footage calculate or enter the square footage of the attic or area to be vented. Make sure your comply with flat roof building regulations.

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.