lindl2 Posted May 26, 2008 Report Share Posted May 26, 2008 Question on the correct venting of a roof with a power ventilator. I inspected a home this weekend that has a hip roof style. The only ventilation the roof has is a power ventilator. No soffit, ridge, gable or roof vent system. Should there be some type of free air venting through the attic. The home is over 100 years old so its not very tight, plus my feeling is its pulling all the AC/heat out through the ventilator. The roof isn't in that bad shape? Quote Link to comment Share on other sites More sharing options...
SonOfSwamp Posted May 26, 2008 Report Share Posted May 26, 2008 Power vent is a money/energy loser. Costs more to run it than it's meant to save. It's like trying to get energy from a water wheel by (electrically) pumping water to the wheel. WJ Quote Link to comment Share on other sites More sharing options...
fqp25 Posted May 26, 2008 Report Share Posted May 26, 2008 There should be soffit venting. More about Power Venting, from Air Vent Check the 6th Bullet point under Design Considerations. Frank Quote Link to comment Share on other sites More sharing options...
msteger Posted June 23, 2008 Report Share Posted June 23, 2008 Originally posted by lindl2 Question on the correct venting of a roof with a power ventilator. I inspected a home this weekend that has a hip roof style. The only ventilation the roof has is a power ventilator. No soffit, ridge, gable or roof vent system. Should there be some type of free air venting through the attic. The home is over 100 years old so its not very tight, plus my feeling is its pulling all the AC/heat out through the ventilator. The roof isn't in that bad shape? Depending upon the type of shingle installed, the power ventilator may have voided the shingle warranty. I recommend against them and recommend instead using ridge and soffit venting. Power ventilators and other types (other than ridge/soffit) can allow for hot spots and can prevent a uniform airflow up under the roof. Quote Link to comment Share on other sites More sharing options...
Jim Baird Posted June 23, 2008 Report Share Posted June 23, 2008 The building science guys don't like them on retrofits because they can pull the conditioned air up into the attic and waste it if you don't have the balance provided by soffit venting. Hips are very popular now, and I think a lot of builders forget about the vent factor. Quote Link to comment Share on other sites More sharing options...
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