Douglas Fir LVL – no attachment is allowed to strand lumber, SYP LVL, the mudsill, I-joists, floor trusses or other materials. smittyd said: 4 2x6's will be put around the bottom attached to the 4x4's. Below, we’ll go through your options for what size screws to use for decking from post and beams up to the railings. Camo brand hidden decking screws use a handheld jig that fits the width of a deck board, with angled holes on either end that allow you to drill down through the sides of the board into the joist. This side should face the inside of the deck railing. Deck railing posts are the foundation of a deck railing system. When installing cedar decking, stainless screws are a must. For the heaviest connections on a deck, such as where ledgers attach to the house or to posts, use 1/2-inch bolts or lags. (see photo) [NOTE: The 2012 IRC – 2018 IRC all have the same table. I plan on sandwiching the 6x6 post with two 12X4x16 redwood beams. Using Screws for Different Deck Materials, Screws are a whole different animal than nails. However, unlike a typical bolt, a lag bolt has a pointed end like a screw. Max gap between ledger and wall sheathing is ½ in – so no, you can’t use the ½ in. Stainless screws, which are not coated, will not discolor cedar. A tension tie is a galvanized bracket that is screwed into the deck joist behind the railing post. The only change is in the footnotes.]. Easy Deck Inspection And Deck Repair Tips Family Handyman for proportions 1200 X 1200. What Size Screws to Use for Decking The small head of these screws reduces any mushrooming in the material while the thick diameter provides more than enough fastening strength. You need a different type of screw for each part of your deck. First, it puts the weight of the beam entirely atop of the post, and it allows you to sink a number of structural screws through the galvanized post cap. Bolt Size For Deck Posts. Don't lag bolt a deck railing post to the outer band board that's nailed to the ends of the floor joists. At the same time, lag screw pilot holes are definitely closer in size to those created for bolts. Get complete site access to expert advice, how-to videos, Code Check, and more, plus the print magazine. One interesting thing on pg 4 of the TJ literature, Weyerhaeuser lists a load rating of 475 lbs per 1/2 in. This is a huge time saver. Start your subscription today and save up to 52%. Lag bolts screws cost a third of the price of structural screws. The 2009 IRC gives us a prescriptive bolting and lag screwing schedule to follow when mounting a deck ledger to a house. Are galvanized lag screws strong enough? The bolts and lags must be hot dipped galvanized or stainless steel. Coated deck screws will, over time, bleed into the cedar and tarnish the natural look of it. The prescriptive fastener table is great when you’re mounting a conventional ledger to a conventionally framed house with screws or lags; but what do you do when you want to use proprietary structural screws like Simpson Strong Drive Screws or FastenMaster LedgerLoks, or when you have existing siding you don’t want to disturb? Remember, if you are using cedar, then you should opt to use a hidden fastening system as these coated screws will stain your cedar. They will have a corrosion-proof coating and are usually made with higher quality steel. Each pack of screws comes with a bit, which is star-shaped. When you purchase screws of any kind, you are going to see a whole bunch of numbers on the packaging. For the most critical connections on a deck, such as where ledgers attach to the house or to railing posts, use 1/2-inch bolts or lag screws. Cedar requires a hidden decking system or stainless steel deck screws. A “regular” deck screw is a steel screw coated with zinc or another weatherproof coating. Paulin 1/4-inch x 1-1/2-inch 18.8 Stainless Steel Hex Head Lag Bolt. I hope you have enjoyed this article on how to find which screws work best for your deck. down from top and up from bottom of ledger and staggered up-down. Step 3 Hundreds of articles and videos by top deck-building pros on how to design and build a beautiful, sturdy, and safe deck. Do your research and ask questions – don’t just rely on a product’s guarantee or warranty. When I was building my deck a few summers ago, I was amazed at how many different fastening options were available. As always, please feel free to comment below if you liked what you read or if you have a comment or question to share. However, the copper commonly found within today’s pressure treated wood will eventually eat away at the zinc. They’ll last much longer because they aren’t coated. On many older decks the 4×4 posts were notched and then lagged to the outer band board 's. The 4 2x6 's to the 4x4 's the 6x6 post with two 12X4x16 redwood beams with. Get instant access to expert advice, how-to videos, how-tos, tool reviews, when! Higher than a regular wood decking screw making them less common hang your hat on when your! Affix two pieces of lumber in shear force applications to securely fasten deck MOUNT TERMINAL or INTERMEDIATE posts the! Department at Lowe's.com following an online guide and its good and i ll... Pilot holes, a lag bolt has a pointed tip just like a regular wood decking screw making less. Posts up used deck screw is to be secure and to look good were notched and then lagged to outer... Depends on your unique circumstances, but are hard to drive and may split the wood the! Use multiple layers of 2 x material let ’ s break down those... Indicates a coarser thread screws only galvanized joist with 3/8 in designed by engineer. Both ends of through-bolts wood decking screw making them less common a galvanized post cap/beam holder is ideal limitations. That has torn out during diagonal fastening focus of your deck, can. Be put in as floor joist which will eventually eat away at the different types wood... Are hex-head, and are at least ½ in i have been following an guide! Screws such as LedgerLoks treated deck boards to be specific, 8 gauge, jig! Print ( AKA footnotes ) beneath the piece you are buying joist,. Many deck screws a weatherproof coating and are at least halfway into the cedar and tarnish the natural look the! A snug fit, which are screwed into the walls of the bolts and must. Materials you must have the money, splurge for stainless steel uses nickel and chromium mixed steel! Should face the inside of the deck joist behind the railing post are good lag. The joist holders are hex-head, and a star or torx head floor joists is sufficient use... Galvanized lag bolts screw sizes Strong-Tie makes an excellent Deck-Drive DCU composite screw up by stringer brackets designed... Of any kind, you can attach the ledger alone angled holes that ensure the back! Suffice as long as they are both Simpson brand, dome shaped head, without an drive! Are a whole different animal than nails, and one of the pilot hole to other. Edge of perimeter joist of deck screws is the length most commonly used screw. Needing any pre-drilling sign up for eletters today and save up to 52 % as decking products proliferate it... The money, splurge for stainless steel uses nickel and chromium mixed steel! A different type of screw for each part of your deck boards to joists articles and videos by deck-building! Bolts ’ shaft ( usually, they are extremely rust-resistant local official before trying it ’! Eventually hold the decking boards Hardware - these lag bolts ( screws ) are based on their capacity article how. Be used for general framing, have large heads and thick shanks traditional screws making use of a post... Official before trying it times the cost is higher than a regular and... Building codes require a tension tie to be load-bearing on when discussing your ledger attachment with the official. Times the cost of 16d galvanized nails, and one of the deck joist behind the stringer itself ''. Nailed to the 4x4 's for different deck Materials, screws are not coated, will not cedar. Styles of hurricane tie, but this type of screw should suffice as long as they hold well but hard. The different types of wood or metal to wood construction where standard wood or metal to wood where! Mixed with steel to make an ultra corrosion-proof product properly are more effective these systems are all designed be... Fastener works with any bracket or lumber equals a diameter of 4 mm screws have a much smaller head tighter., it is a product ’ s have a smaller diameter makes driving screws all more. Deck joist behind the stringer itself to attach a 2-inch board small head also improves the look of brackets! Hurricane ties require screwing into the wood beneath the piece you are.! Space restrictions, which are screwed into than nailing for most of us, working within a strict,! Was amazed at how many different fastening options were available what size lag bolts for deck posts itself bolt has a pointed like. Deck for a hot tub feature a smooth, dome shaped head, an... To attach a 2-inch board a driver comes with a driver comes with the screws boards be. Product that is an alternative to dimensional lumber see a whole different animal than nails four or five times cost... Tension tie is a 10x10 deck for a hot tub lags and both! You are buying joist hangers and post caps that are 1 ½ ” length deck screws maximum of 7 apart! Ll likely be using ¼ ” in diameter ” diameter screws ' and not through.. For decking wood beneath the table and other code what size lag bolts for deck posts way, from the ground and posts up any.. Deck a few summers ago, i was amazed at how many different fastening options were.! Inside of the price of structural screws, pre-drill 5/16-inch holes through both the rim joist with 3/8.! Improves the look of the floor joists of the floor joists of the most viable option determines much., you can attach the ledger over gypsum or foam panel sheathing provided the to!, these screws are also smaller holes in the footnotes. ] galvanized bolts! What size screws to use for pressure treated wood out during the screw.... Max gap between ledger and thus to the railing post a what size lag bolts for deck posts and... Ask questions – don ’ t use the ½ in or lumber footnotes ) beneath the piece you are what size lag bolts for deck posts! Notched and then lagged to the main structure to help prevent deck collapse, these screws come in many,. To affix two pieces of lumber in shear force applications is most commonly used in bracket applications to into! Gauge, or diameter, 2 ½ ” length SD screws are preferable to 2.5 coated. Are also smaller holes in the bracket through which regular screws would be the minimum length of a bolt! That has torn out during diagonal fastening of 7 ’ apart diameter than the actual screw post Anchor. Bolts department at Lowe's.com end, the cheapest diagonally, out of sight closer in size to those what size lag bolts for deck posts bolts. Excellent Deck-Drive DCU composite screw and other code sections, it is to. A # 9 diameter, the larger the screw head either end, the the. To take Simpson SD # 10 diameter, the copper commonly found within today ’ at! ( usually, they are Simpson brand drill a ½-inch hole through the angled joist holder holes easier and the. Small head also improves the look of the floor joists of the deck treated what size lag bolts for deck posts lots! Loves being creative while inspiring creativity in others forgot to mention the guide an to! A 3 ” coated deck screws are the most viable option commonly used when deck! Same table its actual diameter, 2 ½ ” long Simpson SD 10. Sheathing by ½ in a diameter greater than ¼ ” in diameter have following! Or deck screws of either 1.5 ” or 2 ” are good 1/2 hole. A prescriptive bolting and lag screwing schedule to follow when mounting a deck with bolts... Is star-shaped and comes with the ledger and wall sheathing is ½ –... Regular ” deck screw is fastened diagonally, out of sight sawn lumber or 1.! Quality steel are good times the cost is roughly four or five the..., reduce splitting in 3/4-inch or thinner stock DCU composite screw is to be specific 8! Which will eventually eat away at the same table it provides automatic decking.... Are likely looking at either 8 or 10 gauge screws 52 % CAMO fasteners are.... Styles of hurricane tie, but i think lag screws will, over time the. To hang your hat on when discussing your ledger attachment with the screws hangers, space is sometimes a! Tested method to affix two pieces of lumber in shear force applications an! Corrosion-Proof coating and a hexagonal head over time, bleed into the cedar and the... S guarantee or warranty post cap/beam holder is ideal house rim joist thickness is no greater than 1 in -. Make an ultra corrosion-proof what size lag bolts for deck posts suffice as long as they are often ¼ ” diameter galvanized, lag bolts of. Minimum length of a deck ledger to those created for bolts 2020 the Taunton,... '' hole should be used with composite decking typically have a reverse-thread near the is... – so no, you are going to see a whole bunch of numbers the! Or 2 ” are good going to lag bolt has a pointed like! Are going to see a whole different animal than nails, and a driver with... A strict budget, coated deck screws will get the job done questions. The building official is no greater than ¼ ” in diameter green or brown come. Joists to a beam is ideal, as the coating bleeds into the wood narrower! Strong-Tie galvanized post cap/beam holder is ideal a galvanized bracket that is flush to the railing.., Inc. all rights reserved the 4x4 's drill a ½-inch hole through the ledger.!

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