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Dhawkins
Joined: 05 Dec 2005
Posts: 1
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 Posted: Wed Dec 07, 2005 9:52 am Post subject: Deck over wrap around porch, how to drain water? |
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I am building a wrap around porch and am going to incorporate a deck over the entire porch. The porch will be about 30 feet long where it attaches to the house. The ceiling will be beadboard and I would like to encorporate several decorative items like exposed rafter tails made of cedar, and heavy posts of stained cedar and trimmed nicely. The deck will likely be the man made composite EON.
The biggest issue is water drainage from the deck. I've seen other posts suggesting a metal roof under the deck for drainage or even using modified bitumen membranes. I'm concerned about quality and longevity of construction. This is a very upscale house on a golf course. I am in a HOA and will be presenting my intentions for approval. Any thoughts on solving the water drainage problem? |
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JWmHarmon
Joined: 15 Apr 2004
Posts: 111
Location: Ohio
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| Posted: Fri Dec 09, 2005 4:52 pm Post subject: Rubber roofing on porch - waterproof under deck above |
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To correct faulty foundation construction on a house, I dug out around the foundation, built a reinforced retaining wall, and created storage space on the outside of the foundation. The retaining wall is buttressed against the old foundation with flying buttresses. The storage space has convetional wood framing and sheathing for its roof sloped 1 inch every 4 feet for drainage. The sheathing was covered with EPDM Rubber roofing, cemented to the sheathing. Special attention was given to the flashing at the wall so that the rubber roofing membrane tucked under the siding and building paper. The rubber roofing membrane was covered with treated wood decking laid directly without fasteners. This decking was designed to allow for proper drainage. The deck is partially cover by an overhanging roof.
This particular installation has been in place for twenty years without leaks or repairs. The wood decking is deteriorating and will need to be replaced within 5 years, or if the owner decides to sell the house.
Other than the expected deterioration of the wood deck, this combination has been quite satisfactory.
Initially the rubber roofing gave off fumes until it had weathered for several weeks. This was a minor problem during the first summer of use. |
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JWmHarmon
Joined: 15 Apr 2004
Posts: 111
Location: Ohio
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| Posted: Fri Dec 09, 2005 4:58 pm Post subject: Build decks over roofs in section - remove for maintenance |
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Any deck over a roof should be built in sections that can be removed a section at a time just in case the roof is damaged or otherwise develops leaks.
This will add to the initial cost, but will save money if, or should I say when, the roofing needs to be repaced or repaired. |
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Orkblork
Joined: 28 Jul 2005
Posts: 64
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| Posted: Fri Dec 09, 2005 8:02 pm Post subject: |
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| All roofs will eventually leak, of course, but you can design smarter for the day the leaks start: Make sure that the cavity between the roof and the porch ceiling below has a way for water to get out. You can do this by creating weep holes in the appropriate location. The worst situation is when the water that leaks inside just sits there, rotting out the ceiling and structure from the inside out. Also, pre-prime the back side of the beadboard ceiling to retard moisture absorption and to keep the beadboard "true," with less warping and cupping. |
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TLWalkerAIA
Joined: 16 Apr 2004
Posts: 129
Location: Seattle Washington, USA
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| Posted: Wed Dec 28, 2005 2:03 am Post subject: |
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There is no problem here. I would be happy to consult on your project and supply a design solution. In general the deck above must have two seperated systems consisting of a surface you walk on and a surface that is waterproof below it.
email me.
terry.walker20@verizon.net
_________________
Terry L. Walker, AIA
Terry L. Walker, Architects
terry.walker20@verizon.net |
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