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Roofing/Attic Ventilation


Hi Bruce,

I am installing a new roof with the GAF smart vent system. I currently have a ridge vent and attic fan. I have learned that I should get rid of attic fan and close off gables with the new system (should have been done before with soffit vents and ridge vent). My question is, does it make sense to disconnect the attic fan but leave the unit in place to add additional air escape pathway to compliment the ridge vent?

Thanks in advance.


If the attic fan is situated near the ridge, I don't see a problem with leaving it in place.  However, if you are replacing the roof it will leave just another penetration which requires flashing and maintenance.  If you have been satisfied with the past performance of the attic fan, I suggest that there is no harm in leaving it and operating it when you have typically in the past.  So if the fan has been effective you should leave it and leave it operational.  Have the roofer leave you a spare bundle of shingles or two (they should do that anyway) and if in a year or two you find that the fan is useless, you can abandon it then and remove it even if you wish.


Bruce Ryan II, RRO
Professional Roof Consultants, Inc.


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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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