Here are the details in case you d like to build your own building a deck with a roof version.
Cheapest way to waterproof under deck.
For pricing and availability.
The water drains straight.
Screw 2x2s to the joists over the membrane as in the drawing below.
Trex 0 25 ft deck trough.
Designed for contractors and diyers who want an affordable attractive and easy to install vinyl deck flooring product econodek waterproof vinyl decking is more than a deck flooring product it s also peace of mind.
The underdeck ceiling system can turn the ugly space under your deck into an outdoor haven that s dry bright clean and enjoyable without costly reconstruction.
There are underdeck cielings systems that are available but i think the most inexpensive way would be to hang corrugated plastic or metal panels from the rafters.
One method of waterproofing under the deck is to install a membrane.
26 in x 120 in deckdrain opaque tan under deck ceiling panel.
This membrane prevents water from reaching the areas below the deck such as a roof or open area.
First you need to purchase a continuous sheet of epdm which will cover the entire deck area.
To install this system under an existing deck cut the membrane pieces with a shallower droop no more than 4 inches and staple the membrane to the underside of the joists caulking each seam as described in the following pages.
You would need to create a slant for run off and install a gutter at the end of the panels but i think you could get it to stay dry from above.
What makes the underdeck ceiling so innovative is its simple and efficient system of vinyl gutters and panels which attach underneath the deck.
Trex 12 5 in x 10 75 in x 17 5 in brown plastic deck.
This is used to provide a durable long lasting waterproof membrane on top of your existing deck.
Epdm is available in widths up to about 50 so you can generally lay down a continuous sheet without any seams.
And it s inexpensive and easy to build using materials found at any home center.
Several commercial waterproof deck systems are available to create a dry space under a deck but rune stactic of adding a roof to a deck seems to be just as effective.
For pricing and availability.