A: I’ve found that both practically and aesthetically, a 3/16-inch space between deck boards is ideal. Trouble is, what you end up with can vary a … On 2017-01-22 by (mod) - space between deck boards for drainage. One of the most critical steps for properly securing composite decking in place is to make sure you have a 1/4-inch to 3/16-inch gap between the decking boards (don’t exceed 1/2 inch). Screw the 2X4 to the deck boards temporarily allowing room for the saw base (shoe). A convenient way to get consistent spacing is by using a 6-penny or 8-penny nail between each course of decking; the width of the nail is 1/8 inch. Wood expands when it's wet. That decking gap will widen slightly as the deck boards dry, and it will close slightly as the deck boards absorb water in wet weather. Professional builders using standard 5 1/2-inch-wide deck boards attach them at each joist with screws set one to two inches from each edge of the board. Decks, Patios, Porches, Walkways, Driveways, Stairs, Steps and Docks - 5/4 deck board spacing and attaching? Protect Joists From Rot. - I want to know how many of you leave a space(16 penny) between 5/4 boards … I'm doing 8mm ATM, but it does seem a bit wide. A: The Trex Hideaway hidden fastener will automatically create a 1/4” space between each decking board. Use a circular saw and cut down through the seams. I was wondering what the recommended space between deck was for 135mm (x19m) Spotted Gum. Addressing deck board spacing and the problems that arise. There should always be a slight gap. standard framing hammer. The most common spacing measurement between deck boards is 1/8 inch. » Maximum allowable perpendicular overhang for all Trex decking is 13 mm. The other relevant spacing number when it comes to building a deck or porch is how much room should be between the actual decking boards themselves. Most decking is not strong enough to support longer spans than 16". Just place the nail in between the boards to ensure you have enough space. That’s why the board ends should never be installed tight against one another. To prevent this, it is recommended that decking boards be placed with a space between the rows ranging from 1/8 to 1/4 inch. probable depends on location but a 16p was to small ,I used a 20P for years but seem to be getting bigger lately . If your careful and can cut in a straight line. Of course, prime deck-building season is during summertime, when the high humidity levels throughout much of the U.S. dictate that wood width is as swollen as it will be at a… https://todayshomeowner.com/video/how-to-clean-between-deck-boards Since wood fibers act like a bundle of straws that sucks up moisture from the air, we can expect the board width to expand with increased moisture. Yes, a gap between the boards allows for drainage of surface water and airflow around and beneath the boards. Decking manufacturers may recommend anywhere between 12 and 16 inches for commercial decks and 12 to 24 inches for residential decks. When securing the decking, it is important to leave adequate spacing between the boards for water to drain. Install the first course of decking material. A tell-tale sign of a potential problem with the ledger board attachment is the … Proper spacing allows moisture to drain off the deck between the boards. https://www.dropbox.com/s/z z5a5araqtw4gcj/2015-09-19%20 18.54.12.jpg?dl=0 User #16740 1910 posts Once your decking is cut to fit, secure a piece of wood along the outer edge of the deck. When this happens the wood can swell, causing problems with joints and fasteners and even doing damage to surrounding pieces. Sixteen penny nails are the best way to establish the amount of space needed between your deck boards. MINIMUM GAP AROUND PERIMETER. 4-6mm for 90mm seemed to be the googled recommendation, so I added 2mm. First, it allows for proper drainage and keeps the deck cleaner, safer, and less prone to moisture problems. Pressure-treated lumber is rot-resistant, not rot-proof. We didn't leave a single gap in 30ft of decking. Joist Spacing for Composite Decking Adjust the spacing between deck boards gradually over the next 10 rows of decking until the distance to the house is equal. Use a mallet to rap the edges of the boards and snug them up tight to one another. Before you start cutting the deck, measure the width of the area to determine how many pieces of decking you need. We used furniture clamps to crank each board tight to the next one, now a few months later there's a 1/8ish gap and that's with pressure treat. and three-sixteenths of an inch (3/16 in.). If your deck is slightly out of square (different widths), calculate results for both widths, and set out each end to suit. The desired spacing varies according to the brand of decking boards used. When using a minimum 2x6 joist standing on edge and the suggested 1/4" side gap, there should be a 2" clear space between the bottom edge of the joists and grade in order to allow for proper ventilation. This gap can be the same size as that between the decking boards or 1/4 inch larger. If the boards are pressure-treated lumber, they should not swell or shrink with moisture. Answered. Spaces will only allow for losing small items that are dropped down the cracks, or getting splinters in your foot. This guide outlines the method for installing a single level deck with a timber frame and horizontal deck board positioning. When cutting the decking to size, make sure you wear the right safety gear. Video of the Day Volume 0% If the deck boards are relatively dry, use 16 penny nails to establish the proper gaps between the boards. Veranda decking, like all wood and composite decking products, requires proper ventilation and drainage in order to ensure its longevity. There is less of a hard-and-fast rule when it comes to this, but generally that space is anywhere between one-eighth of an inch (1/8 in.) As temperatures fluctuate, composite deck boards will naturally experience thermal expansion and contraction. Some builders reduce joist spacing to 12" on center to strengthen the deck frame or to increase maximum allowable joist spans. In writing this, we’re assuming you already have the cedar deck framed up with 16-inch spacing between the joists. The exact measurement doesn't matter as much as uniformity of spacing for appearance's sake. Despite the frustrating reality of fluctuation, wood offers us this consolation: its movement is predictable. So it is not necessary to leave spaces between them. When decking up to buildings or door sills, install the joist … This is for the homeowners out there that are finally ready to put the finishing touches on their deck (except for stains and sealants of course) and are wondering exactly what cedar deck board spacing to use and why. If necessary, adjust number of deck boards to match in both calculations, and see if different board gaps at each end of deck are acceptable, compared to equal gaps and cutting the last board … The last board won’t look good if … To learn more from Steve, visit https://baileylineroad.com/. To improve air flow, leave openings under the decking or increase gapping to 10 mm. In this guide, we’ll go over the proper joist spacing for composite decking as well as some common installation mistakes you should avoid. Make sure the boards are dry when you begin spacing them. Leave a gap between the decking board closest to the house and the ledger. Filling the space between the floorboards on a deck. Q: What size gap between the boards? When using Trex decking without the grooved edge, a router bit will be needed to create a groove at each joist. Adjust spacing between deck boards Measure to the house at both ends and in the center when you get within about 5 ft. of the wall. Adjust the blade about 1/8' more than the thickness of the deck boards. No Lag Head Screws. This will allow water to drain in between the boards and not pool-up, causing damage to the deck. Answer + 1. Two places our pros … If the boards are wet when you install them, you can probably butt them close together without any gap. How much gap should I leave for expansion or contraction when installing? This video is about the importance of spacing treated lumber decking when installing it. Re: spacing for cedar deck boards i have never noticed a difference between rdwd and cedar as for spacing .it was moisture in the boards that was tricky . 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