How To Build A Waterproof Deck Roof
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Make sure it s free of all dirt and debris.
How to build a waterproof deck roof. Porch decks require 25 additional psf for roof loads for a total of 80 psf. There are a few things that make pvc decking different in regards to roof decks. This is used to provide a durable long lasting waterproof membrane on top of your existing deck. Step 2 cover the deck.
Then run joists connecting the front of your roof with the rear every two feet along the length of your roof. Frame up a box the size of the outer dimensions of your deck using 2 by 4 inch lumber. The drainage system flashing details and waterproofing membrane that go over the structural deck are the key to success. Step 1 clean the deck.
As a result most decks have inadequate footings to support a new porch roof. First you need to purchase a continuous sheet of epdm which will cover the entire deck area. It also incorporates coolstep technology so you don t burn your feet and can also potentially lower your. That s unfortunate because building a reliable long lasting waterproof deck over living space is relatively straightforward when the best practices and materials are used.
How vinyl waterproof decking benefits roof decks. There are a number of icc es listed manufacturers of class a walking deck systems see class a fire resistant walking and roof deck systems sidebar. Currently about 10 of our projects include a dry space under the decking either in part or under the entire decking surface. The footings for porch decks must be larger than deck footings.
Materials required fiberglass panels gutter and downspout pressure treated 2x4s roofing screws. Many porches use 22 diameter corner and intermediate. Deck framing needs to be sloped with at least a 1 8 inch per foot pitch for drainage a consideration when you re retrofitting an existing deck with a waterproof decking product. Epdm is available in widths up to about 50 so you can generally lay down a continuous sheet without any seams.
Raintight panels made of aluminum lock together to create waterproof joints. A perimeter frame and graduated spacer nailers are fastened beneath the deck joists so that the plane of the ceiling slopes slightly at least 1 4 inch per foot away from the house toward the joist header. Cover furniture or items on your flat roof deck that are not meant to be waterproofed with the drop cloth. Typical decks are designed to support 55 psf lbs per square foot.
Build the frame of the roof on the ground.
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