1/29/2023 0 Comments Installing rafter vents![]() No matter what, be sure to check local building codes to see what the minimum requirement is for your area. If you live in an area with a humid climate, it may be best to go with the higher standard to ensure you have plenty of ventilation which can save you time and money down the road. Attic Rafter Vents comprise XPS that is thermoformed to a shape that, when installed between roof rafters, allows air to flow from the soffit to the attic. However, some authorities recommend one square foot of attic ventilation per 150 square feet. Ventilation should be placed in a way that allows air to enter from along the eaves and exit through the roof’s peak.Ĭommon conventions call for one square foot of attic ventilation per 300 square feet of ceiling space. Because this air contains moisture, you will be able to see condensation (or frost, if it’s especially cold) on the attic’s ceiling.Īn attic with sufficient ventilation will have equal levels of incoming and outgoing air. Add this product to your specification on NBS or SpecifiedBy. On roofs with rafter spacings of between 400mm and 600mm centres. ![]() You can also inspect your attic from within to see if warm air is being trapped inside. On standard pitched roofs where the pitch is 15 degrees or more and the roof void is an attic or loft space. The ice forms due to warm air from the indoors getting stuck inside the attic, causing rooftop snow to melt and refreeze along the eaves. ![]() Depending on the size of the opening, set a half-sheet of 3/4-inch plywood across the rafters.
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