It would need to be cut into strips and stapled into place. One $20 roll can cover up to 200 to 400 square feet, which would be more than enough for the standard deck. They are coated/saturated with either asphalt or tar for waterproofing. Roofing felt or tar paper are used as underlayment in roofing. ![]() Priced anywhere from $20 to $40 for 50 linear feet per roll, the tape can get fairly expensive especially if you have a large deck. If you’ve repaired or replaced decks before, you’ll likely have noticed that the fasteners and the ends of the joists usually rot due to moisture damage first. The butyl flashing tape not only protects the joists, it also makes the joists less noticeable from above. Protecting Joists From RotĬomposite decking manufacturers recommend applying deck flashing to the tops of joist to protect them as well as the screw holes from moisture damage which will eventually rot the screw fasteners. This will allow you to hang the joist on the ledger or rim joists while you toenail or set a joist hanger. Hanging JoistsĪ handy trick for making sure your joists are level with the rim joists or ledger is to attach a strip of wood to the top of each end of the joist, overlapping each end of the joist by a few inches. Unless they are severely water damaged, leave the old joists in place as supplemental support in addition to your new 16″ center joists. If you are updating a much older wooden deck, there’s a chance that the joists may be set 24 inches on center. ![]() If you are laying your boards on a 45 degree angle, you’ll want your joists spaced at 12 inches on center. The minimum recommended spacing for most composite deck joists is 16 inches on center.
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