Start the installation by securing each board with a few screws to keep them in place. ... Once all of the decking is in place, snap a chalk line so that the screws can be installed in straight rows over the underlying framing. Each board should recieve 2 screws per joist, spaced about an inch from each edge. Read more
When securing down the boards, use two fixing per joist and opt for screws to enhance its durability. Make use to position the screws at least 15mm from the end of the deck board, or 20 mm from the edge of the deck board to avoid the risk of splitting the timber.
Bottom Line. 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. The exact measurement doesn't matter as much as uniformity of spacing for appearance's sake.
The general rule of thumb for standard deck fasteners is 350 screws for every 100 square feet of decking, which is based on standard 6" wide boards (5-1/2" actual), and 16" joist spacing.
Deck joists are typically spaced either every 12 inches or 16 inches on center. The maximum joist spacing you can use will depend on the size and allowable span of your joists.
4 x 2 Timber Rail / Joist
These decking joists are the most common sized framing timber for decking. They provide a solid structure for fixing your decking boards too. When making your decking frame you should use a 400mm spacing between your timber joists.
Do Deck Joists Need to Be Treated? Pressure-treated lumber is ideal for deck framing. We also recommend using joist tape or a wood protectant to help shield cut ends from moisture damage. ... Install a drainage system: Make sure you have some sort of water drainage system installed under your deck, but above your joists.
Proper Gap between Decking Boards
When installing decking boards, make sure to leave 1/4 to 1/8 inch gaps in between them. This gap will make sure that the decking can breathe, have sufficient drainage, and make it easier to clean.
Deck screws installed in the field, not close to the board's end or edge, need not be predrilled. Predrilling is required near the end of deck boards to make room for the screw. As the screw is acting like a wedge, driving between the wood fibres. That screw pushes against the decking, splitting open the board.
Most decking screws are 8-gauge and, while 2 1/2 inches is the minimum length needed to hold decking boards to the joists, 3-inch screws are commonly used to provide extra holding power against the upward pressure of shrinking or warping boards. Specialty decking materials have different requirements.
You need an expansion gap of 5-8mm between the boards. If you are going to build your decking next to a house then make sure it's 150mm below the damp-proof course and that you don't cover any air bricks. Try to plan your deck to fit only whole boards, to avoid having to awkwardly cut a board lengthways to fill a gap.
It is advisable to pre-drill pilot holes near the end of boards to avoid splitting. Decking board screw length should be 2.5 times the thickness of the decking board.
The most likely cause of deck screws snapping is a combination of the boards and the screws. Simply, if the boards shift, it alters the pressure on the screws, and they may snap. ... So, a good screw will hold and tight and hopefully survive a bit of warping, and a poor-quality screw will snap.
Conclusion: Deck Screws Should Be Counter Sunk Never Flush
Installing deck screws slightly below the surface accommodate the shrinking of the decking as the boards dry. Doing this will create a clean surface for the decking for walking on while minimizing the visual effect of the screw heads.
Pilot holes are necessary if you're drilling into hardwood, laminate, or need a precisely located fastener. They're also recommended if the wood is likely to crack, or if appearance is important. You can skip the pilot holes when doing a rough build with softwood where appearance isn't important.
Without the right deck spacing, the boards may expand, cup, and buckle out of place. ... There is no reason to put a gap between the ends (also known as butt ends or butt joints) of wood deck boards. Wood, both softwood and hardwood, is dimensionally stable in length regardless of temperature, humidity or moisture content.
Lay deck boards so that the best-looking face is facing up! Wood is stable when its moisture content is held above 30%(fiber saturation point). As wood dries below 30% it shrinks. Wood shrinks and swells twice as much in the direction parallel to the growth rings as it does perpendicular to the growth rings.
The main thing to know is how to place the deck boards properly. This then leads us to the most debated question about installing deck boards: crown up or down. The direction affects how the boards shape over time – cupping or crowning. Deck boards should crown up – bark side down.
On most decks, the decking boards run parallel to the house and across the joists (either perpendicular or at a 45 degree angle).