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Roofing/Whole house fan and ridge vent


Hello Bruce
I am having my house re-roofed.  I currently have an attic floor mounted whole house fan.  I have large gable end exhaust vents.  I do not have soffit vents.  My roofer suggested a ridge vent.  I am concerned for a couple of reasons.  One is that I do not have soffit vents to pull in outside air.  I know the ridge vents are designed to work in conjuction with soffit vents.  Another concern is that the attic fan is mounted almost directly in line with the ridge so it will blow air nearly directly on to the ridge vent with great force.

I don't think that my gable exhaust vents should be used as the inlet for the ridge vent.  Will a ridge vent help or hurt ventilation in my situation?



If you are happy with the performance of your attic ventilation generally I seldom see a need to modify it. If you are making changes to your roof configuration or are changing the color of the roof to a much lighter or reflective surface then consider additional ventilation if required to meet code. Ridge and gable vents do not work well together.  


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Bruce A. Ryan II, RRO


I offer solid knowlege of all types of Commercial and Residential Roofing, Waterproofing, and, Building Envelope systems. Experience ranges across low slope and steep slope roof systems. I am also well versed in matters regarding condensation and ventilation. I enjoy donating some of my time and knowledge to the betterment of others.


Bruce Ryan has 20 years of roofing, waterproofing, and building envelope consulting experience with PRC, with 5 years of commercial roofing experience prior to joining the firm. He became Vice President of the company in 1998. Bruce Ryan plays a key role in the development of practical, long-term roofing and waterproofing solutions, along with implementation of on-site forensic studies. Bruce also has a high level of experience with regard to the impacts of roofing materials and construction for demanding clients with heavily occupied structures.

Oregon Construction Contractors Board Construction Specifiers Institute National Roofing Contractors Association The Institute of Roofing, Waterproofing, & Building Envelope Professionals Oregon Board of Investigators Installation Masters

University of Maryland BS Business & Administration Registered Roof Observer - RCI Private Investigator Certified EIFS inspector - Northwest Wall and Ceiling Bureau Certified InstallationMaster™ - The Installation Masters™ Training and Certification Program (developed by American Architectural Manufacturers Association)

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