How To Ventilate A Roof

Flat roof ventilation allows for the circulation of air in the property particularly for warmer rooms in residential buildings.

How to ventilate a roof.

If you see dampness or frost you need better roof ventilation and some attic vents. Good roof ventilation can do this but shingle color sun exposure and insulation are exponentially more important to overall energy efficiency than ventilation. Sure installing roof vents for older homes can reduce your hot air during the summer but there are probably more low risk cost effective ways to increase your home s energy. Hot air exhaust vents located at the peak of the roof allow hot air to escape.

There are two types of flat roof systems warm and cold roofs which affect the positioning of the ventilation. When thermal insulation is placed below the deck the ventilation must. What is flat roof ventilation. Unless you re bulk filling rafter.

The code calls for a minimum of 1 in. Of airspace between the top of the insulation and the back of the roof sheathing. If you choose to vent the roof deck then be serious about it and really vent it. Prior to installing the ridge vent a 1 inch wide strip of roof decking is cut out along both sides of the ridgeline to allow for air movement through the vent.

Roof ventilation this picture represents what is considered to be the best way to ventilate a roof space. Roof ventilation depends on the simple scientific fact that hot air rises. Grab a flashlight and inspect your attic during the winter. Fairly simple stuff fresh air in old stale air out.

For best performance the airspace in the vent chute should be a minimum of 2 in. For the best results place roof ventilation near the roof s peak and soffit vents in the eaves. Hot air beneath the metal needs an escape route near the top of the roof and intake vents at the bottom of the roof. Different forms of high and low level ventilation are used as well apart from the soffit vents and ridge vents pictured.