Deck Membrain For Gutter

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

Deck membrain for gutter.

Screw 2x2s to the joists over the membrane as in the drawing below. 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. An under deck gutter system works perfectly as long as the material captures and diverts the water correctly.

Cd grade ply with minimum cca treatment and minimum 17 mm thick must be used. Decking boards are then installed over the top. 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. 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.

The downspouts can be oriented to fit between joists spaced 12 or 16 inches on center. Products installed above the joist use a rubberized membrane that drapes down between each joist bay. Membrane deck surfaces require a solid substrate as support. 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.

Plywood substrate and timber deck joists must have a maximum moisture content of 20. 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. 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. Plywood is the most common type of substrate used and must meet the following guidelines.

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. 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.