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Roofing/Sealing plywood under deck.
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Question
I have a deck that goes over a storage area at the back end of my garage that is part of my two story house. When I moved in it was covered with plywood. The area is 5' X 16'. When it rains it drips through the seams into the storage area. I am going to replace the plywood with new. I am planning to put cedar decking over that. What do I need to put over the Plywood to seal and protect it. The deck is of course flat.
Keith,
If you want the plywood to last and not leak, install it with at least 1/4"per foot to slope to drain away from the house exterior walls. Install a low slope roof membrane over it and integrated into the exterior cladding of your residence. Float a sub frame for the deck on top of the membrane shimmed to level the cedar deck. Provide protection pads for the support structure of the cedar deck where it rests on the roof membrane and don't drive any fasteners through the membrane. Install a gutter at the edge of the roof to catch the drainage. That should about do it.
Regards,
Bruce Ryan II, RRO
Professional Roof Consultants, Inc.
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Answers by Expert:
Bruce A. Ryan II, RRO
Expertise
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.
Experience
Bruce Ryan has 13 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.
Organizations
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
Education/Credentials
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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