Roof Space Ventilation

Often called a felt lap vent because they are mostly fitted to older roofs with bitumen felt.

Roof space ventilation.

Intake vents located at the lowest part of the roof under the eaves allow cool air to enter the attic. A hot ceiling tells you that the attic is acting like a solar oven. Hot air exhaust vents located at the peak of the roof allow hot air to escape. So the decision to vent an attic space is not dictated by building code.

Condensation encourages rot and mould growth. Look at your eaves and roof. Before we explore how to ventilate an attic space it is prudent to understand how much ventilation is needed. Ventilating attic spaces is often viewed as a technical requirement for steep slope roof assemblies as well as a building code requirement.

You can see these fitted to most modern houses and are. Vent the roof deck. Touch your ceiling on a warm sunny day. Bathroom vent felt lap vent.

Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. Soffit vents sometimes known as eaves vents. Here are four signs of an unventilated or under ventilated attic. If the attic space is going to be conditioned either for living or mechanical purposes or if a home design calls for a vaulted ceiling provision r806 3 in the international residential code calls for the roof deck above the space to be vented continuously from the eave to the ridge.

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. To calculate the amount of ventilation you need for your home visit gaf s ventilation calculator now. Proper attic ventilation can help reduce the load on your air conditioner. The air gap dimensions shown on the drawings are the minimum widths required for clear continuous ventilation air paths at the eaves.

Calculate or enter the square footage of the attic or area to be vented. Ventilation at the eaves roof voids must be ventilated in order to stop warm air condensing on cold surfaces. Ventilation of attic spaces is required by most building codes as well as by roofing material manufacturers and the national roofing contractors association nrca. Most building codes require a ratio of 1 150 ventilation space to attic floor space.

Too many people believe the importance of roof ventilation is to increase energy efficiency during the summer. If you don t see any attic vents on the roof or in the eaves you need to add some. It really is a design choice. If you need soffit vents the good.