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Question DetailsAsked on 4/11/2012

Do you need soffit vents on all four sides of your house?

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1 Answer

Voted Best Answer

This really depends on the size and shape of you rhouse. For example if youhave a hip roof I would highly recommend venting alls aides of the overhangs. If you have a gable roof I would not vent the sides with the rakes/gable ends.

Determining how much ventilation is a science. The rule of thumb commonly used is to vent every 5' or so, but this really depends on what kind of vent you are using. A 4"x16" vent won't allow in as much air as a 8"x16" vent. A 8x16" vent won't allow as much air as a vented soffit panel. A 1' vented soffit panel won't allow as much air as a 3' vented soffit panel. Make sense?

If I run a quick math formula, on a 1,000 sq ft house (not the roof, but the attic) this is the MINIMUM I come up with: 9 8"x16", 12 6"x16", 18 4"x16", 54 linear foot of continuous 2" wide vent. remember this is for a 1,00 sq ft house, which is rather small. What you need may likely be double or triple the above numbers.


Answered 8 years ago by ReliableAmericanRoof



The answer is a mathmatical number and cross ventilation. You should have vents that are opposite each other and you should have enough vents to allow air to flow up into your attic and out through the roof vent, attic vents or gable vents.

Generally more is better, but if you look at the IRC you will find they have a formula for calculating the square footage of your attic, and with a minimum of 2 vents what size those vents should be. Adding more vents lowers the size of the vents needed, etc.

On a hip roof, a continuous vent or evenly spaced vents on the long sides with a ridge vent usually is more than enough to get circulation.

Hope that helps!




Answered 8 years ago by Kenny Johnson

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