Proper Roof Venting For Split Entry Ranch

Porch roof ventilation options.

Proper roof venting for split entry ranch.

Our page top illustration adapted and edited from carson dunlop associates a toronto home inspection firm explains that to avoid un wanted air movement from the occupied space into the attic or under roof space it is important to have the proper ration of soffit or eaves intake venting to ridge or roof top outlet venting. If you don t have soffits or your roof style doesn t allow for soffit vents some homeowners will consider a drip edge vent. Center nails between rafters 18 in. Proper roof ventilation is an important aspect of home construction.

The code calls for a minimum of 1 in. The code calls for a minimum of 1 in. Of airspace between the top of the insulation and the back of the roof sheathing. Effective attic ventilation systems reduce damaging heat and moisture in your attic promote energy efficiency by helping to reduce the load on your air conditioner in the summer and also reduce the risk of ice dam formation on your roof.

If you choose to vent the roof deck then be serious about it and really vent it building scientist dr. Of airspace between the top of the insulation and the back of the roof sheathing. Hot air beneath the metal needs an escape route near the top of the roof and intake vents at the bottom of the roof. Mark attic roof air vent locations.

It is important that air movement occurs and is not impeded by any framing members of the home. How to install roof vents. 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. If you choose to vent the roof deck then be serious about it and really vent it.

Drive nails up through the sheathing and shingles to mark roof air vent locations. Roof vents will provide about half of the vent area and soffit vents the other half. Drip edge vents are a two in one installation that promote water shedding at the eaves and rakes of a roof while also allowing for ventilation into the attic. Unless you re bulk filling rafter bays between 2 10 or 2 8 rafters with closed cell spray foam this approach will likely require you to fur out the rafters to accommodate additional insulation to achieve desired r values.

For best performance the airspace in the vent chute should be a minimum of 2 in. See the benefits of attic ventilation a new roof is more than just shingles. A ridge vent is a ventilation strip that is placed along the ridgeline of the home. From the roof s peak.