Deck joist tape, also known as flashing tape or butyl tape, can help increase the longevity of your decks lifespan by upwards of 20 to 30 years simply by applying it directly to the deck joists during new construction or during deck board replacement.
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Measure and cut a strip of deck flashing tape to the coordinating length plus an additional 1 inch to overlap joist ends. Continue this process and apply tape to any surface that can hold water: all joists, rim joists, beams, and ledger boards. Slow and steady wins the race and ensures a watertight seal. While overlapping ends of flashing strips is okay, applying two complete layers wont increase the watertight barrier, however, it will increase your overall cost. I run their design-build division that specializes in custom homes, commercial design-build projects and sub-divisions. Duraflash Vinyl Deck Flashing Treated Full List FlashingMenu Home About Advertise Contact Disclaimer Privacy Policy Home improvement topics Browse Categories: Structure Mechanical Workshop Landscaping Design Interior Spaces Tools Products Full list Flashing A Deck Ledger Board Properly By Todd Fratzel on Decks Porches, Framing Tweet Deck Ledger Board Flashing Detail Lately Ive been seeing problematic deck ledger flashing details so Id like to share with you my perspective on how to properly flash and secure your deck to the house. Properly flashing a deck ledger seems to be a lost skill with most weekend warriors.lets discuss how to properly secure the deck ledger and install the flashing. However, there are some details that must be followed in order to prevent premature failure of your deck and the area of your house that its attached to. The problem with attaching a deck to the house is it creates a great area to collect water. The intersection of the house and deck is extremely vulnerable to moisture problems. As you can see from the diagram and the photo flashing must be done in layers. The best way to think about it to visualize what a drop of water will do as it hits the deck and moves towards the house. First the rain hits the siding, then it gets to the house wrap, then it hits the drip cap flashing and runs out away from the house. Duraflash Vinyl Deck Flashing Treated How To Flash AHow To Flash A Deck Ledger Board First I like to install a layer of self adhering bitchathane (we like Grace Ice and Water ) behind the ledger and above it by at least 12 inches. Next mark the location of the bottom of the ledger board and install a small piece of z flashing. When I bolt the ledger board to the house, I like to install 3 or 4 flat washers between the house and the ledger to allow water and moisture to escape and not get trapped. The reason is lag screws dont hold very well when then only penetrate and inch or so into the rim joist. Make sure you seal all around the bolt heads with some silicone caulking as another line of defense against water. Next youll want to install a piece of metal drip cap flashing above the ledger board. When you install the floor joists youll need to make some small cuts in the flashing to allow the top of the joist to line up with the top of the ledger board. Make sure the house wrap is long enough to cover over the top of the drip cap. This is a bit different than the photo.) If there is already house wrap on, then cut a slit in the house wrap just above the top of the ledger. The siding above should terminate slightly above the surface of the decking to allow air into the space. Just remember, if water gets into that intersection its now going to follow the plane of the drip cap and be pushed out away from the house. If you follow these steps the next time you install a deck youll be sure to eliminate a premature failure due to excess moisture and rotting. Alternate Detail for Masonry Siding If you have brick siding then you need to use a slightly different approach. The steps are as follows: Grind out the grout along a row of bricks. On the end that will fit into the mortar joint bend a very small hem that will act as a wedge. ![]() If youre planning on building a new deck get yourself the Complete Guide To Decks. If you want to make your own flashing you can purchase a Tapco 10558 PRO 19 10-Foot-6-Inch Wide by 19-Inch Throat Portable Brake More on Decks Porches, Framing Framing A Raked Wall DIY Decks Dont Be A Failure Sherwin Williams DeckScapes Clear Deck Sealer One TIME Wood Protector Before After Porch Skirt for Farmers Porch About the author Todd Fratzel Im full time builder for a large construction company in New Hampshire.
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