Deck Membrain For Gutter

Epdm membrane for the water to drain towards the gutter the epdm membrane has to droop between the joists to create a trough that slopes down the length of the joists to the gutter.

Deck membrain for gutter.

A revolutionary under deck drainage system uses a network of troughs and gutters to divert water from the deck shields the area below the deck from rain snow sun and other elements provides 100 protection of the deck substructure from moisture. Plywood substrate and timber deck joists must have a maximum moisture content of 20. Plywood is the most common type of substrate used and must meet the following guidelines. It doesn t have to look like that.

Membrane deck surfaces require a solid substrate as support. A piece of material stapled on the inside of the band joist in each joist bay is also a good idea to protect the band joist from water and to direct water into the gutter. Screw 2x2s to the joists over the membrane as in the drawing below. The trex rainescape membrane which comes in rolls is fastened loosely to the top edge of deck joists.

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. Cd grade ply with minimum cca treatment and minimum 17 mm thick must be used. Sloping the membrane so one end is lower than the other allows the water to flow to a downspout at the end of the joist. What makes the underdeck ceiling so innovative is its simple and efficient system of vinyl gutters and panels which attach underneath the deck.

Butyl tape is applied to seal all seams. Products installed above the joist use a rubberized membrane that drapes down between each joist bay. An under deck gutter system works perfectly as long as the material captures and diverts the water correctly. And you will a need a metal or plastic gutter at the outer edge of the deck inside the band joist to catch the water from the troughs.

At the head of the joist bays usually at the ledger i allow for a 1 to 1 1 2 inch deep trough. 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.