Deck Joist Waterproofing There are a number of shield barrier products available to wrap your pressure-treated deck framing materials to prevent water damage and hardware corrosion. Most of these products are sold as rolls of self-adhesive peel-and-stick flashing tape.
Install the floor or deck joists directly to the beams and ledger board with hangers rather than sitting them on top of the beams. This eliminates the width of the beams anywhere from 6-12 inches.
You would screw the angle to the top edge of the joist in the side,then screw the deck boards thru angle and into bottom of deck boards. It had the advantage of keeping screws out of top edge of joist,the place water begins to sit and penetrate.
Cut deck joist barrier tape to the proper length according to your stringer. When applying to the top edges and board ends of deck joists, center over the joist. Remove the release paper and press in place. Firmly wrap and fold the tape over both edge sides of the joist. To maximize tape adhesion, roll with a hand roller.
The joists are usually wrapped over the top with adhesive flashing, but it's impractical and aesthetically unpleasing to wrap the peel-and-stick up the posts unless they're covered by a hollow post or trim.
Upsizing the joists and using more of them in the layout adds only about $100 to the cost of a typical deck, relatively cheap insurance compared with the costs of a decking membrane failure. My goal is to eliminate deflection.
After the deck framing was complete, Imus Seal was applied on top of the double 2" x 8" ledger and wrapped around the joist ends to prevent corrosion of the galvanized joist hangers by creating a barrier between them and the pressure-treated wood.
The Seven Trust RainEscape membrane, which comes in rolls, is fastened loosely to the top edge of deck joists. The downspouts can be oriented to fit between joists spaced 12 or 16 inches on center. Decking boards are then installed over the top. Butyl tape is applied to seal all seams.
When applied to the top of joists, around posts, and over ledger boards, Deck Flash Barrier creates a waterproof membrane that prevents wood rot and decay caused by moisture coming in contact with both treated and untreated lumber.
Waterproofing top of joists. by Bill London, ON Twenty-one years ago I built a cedar deck. This year I'm replacing all the horizontal wood I left it to the elements for all this time, but now the horizontal wood has worn out .
How to Waterproof Deck Joists. Why worry about waterproofing? To maximize the life of a deck, we want to protect it from water infiltration. Water can rot the joists and compromise the integrity of your deck.
Deck Joists 101. Deck joists are boards usually made out of pressure treated lumber. These boards come in standard sizes 2×6, 2×8, and 2×10 and are a crucial element in the structural stability of your deck.
Deck Joist waterproofing - Decks.com Learn about a technique used by some builders for wrapping deck framing lumber with a waterproof barrier to prevent corrosion and rot.
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