Porches, decks Rubber membrane cures leaks in deck

Published on January 4th, 2017 | by Henri

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Rubber membrane for leaking deck

Q.  All homeowners should regularly read your column!!!  Your post about using a rubber membrane on a leaking deck is a perfect solution for my deck. Unfortunately, I only have 1-7/8″ clearance with the door. Can the pressure-treated lumber be thinner, and attached to thinner sleepers with liquid nails? Also, what can be used for the soft cushion? Thank you.

A.  If the door to your deck swings inward, you can simply have a step up to the new deck cover. Leave a 1-inch space between the wall and the deck clear for drainage.

If the deck is flat, lay ½-inch XPS foam as a cushion, rip 2-inch by 4-inch pressure-treated (PT) in half as sleepers and adhere them to the foam with liquid nails, which is labeled as compatible with foam insulation. Screw PT deck boards to the sleepers, making sure that you do not punch holes through the membrane. But if the deck is sloping,  you can cover the membrane with ½-inch XPS and rip 2-inch by 4-inch PT on an angle to be able to level the new deck boards. If the door swings outward, and you do not wish to have it reversed,  you may do the following: lay 1/2-inch XPS over the roofing membrane as a cushion. Mark a space allowing the door to swing fully open and frame it with pressure-treated  2-inch by 4-inch members.

Adhere 1/2-inch PT plywood or PT deck boards to the foam in the door-swing space, and further held in place by the surrounding raised deck.
Build the new deck over the rest of the existing deck.

I hope that, if you plan on doing the job yourself, these instructions are clear enough, but a skilled carpenter should have no problem figuring this out.

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