How To Waterproof Under A Deck
No matter how you decide to go about waterproofing your deck controlling the water runoff is a primary.
How to waterproof under a deck. Apply tar tape to seal along the top surface of the joist rails to seal them. Install the joist rails to the sides of the joists following the chalk line you marked in step 2. Our system provides you with a waterproof under deck by locking into a sturdy grid of supports across the underside of your deck. Mount the joist rails with galvanized nails then caulk along the top seams.
How to waterproof under your deck drainage. Each component is chosen because of its durability. The beams are constructed from heavy gauge alloy not a vinyl under deck that is resistant to rot and weathering even in harsh salt air environments. Epdm is available in widths up to about 50 so you can generally lay down a continuous sheet without any seams.
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. Raintight panels made of aluminum lock together to create waterproof joints. The manufacturer s instructions specify how to cut the joist rails to allow for expansion.