Building a deck is a great way to extend the outdoor living space of a home or business. Why would an F-35 take off with air brakes behind the cockpit extended? I worked mix under the bracket to make sure there would be a flat, solid surface when the concrete dried. If rebar is not used to anchor the old footer to the new concrete, the deck could lift up and crash down. Of course, a 66 post for the deck has a few other benefits beyond just its load-bearing abilities. You will need to cut the 4 x 4s to the correct height to fit under the beam, use a laser level or string level to mark all the posts at the correct height and cut the tops off ( do not forget to put treatment on them for weather proofing ). Given that the price difference tends to be minimal, the choice between these two post sizes is clear. The process seems straightforward enough: As an alternative, I've considered just adding 3 more 4x4 posts and attaching those to the beam (and retrofitting the old ones) with these. By submitting your email, you agree to our. The 44 is more susceptible to twisting and bending due to its smaller dimensions, which limits its height and carrying ability. I've never had a positive experience with one, they mostly just repeat stuff they have heard and don't really understand. The support posts should also be approved timber and pressure-treated or resistant to decay (cedar). Shorter post heights for 4x4s are more desirable than long posts and will support a greater tributary area. However, it is advisable to always check with the local building department as some only permit 66 and some permit both for specified heights. Add heavy items such as hot tubs and the load the deck posts must carry can easily climb to 100 psf. In 2019, my father-in-law and I worked on a large home improvement project. 2022 The Arena Media Brands, LLC and respective content providers on this website. The 44 should not be notched to the deck. All Rights Reserved. One on each side, directly under each deck beam so you have a 2x4 supporting each deck beam and not just the carriage bolts. What does an area represent in a spacetime diagram? 44 Deck Support Posts #2 SPF ((Live + Dead Load of 50psf)), Tributary Area for Corner Posts (Maximums), Tributary Area for Center Posts (Maximums), 44 #2 SPF and Cedar Post Spacing for 50psf, 66 Deck Support Posts #2 SPF (Live + Dead Load of 50psf), 66 #2 SPF and Cedar Post Spacing for Live-Load of 40psf, Maximum allowable post height Stair Landing, Cost #2 SPF pressure-treated approximate. If your beam was a 3 ply instead of a 2 ply, the 1" notch leftover on a 6x6 wouldn't really hold anything. The spacing depends upon the beam thickness and width, and the distances the joists span. As a little background, our code required #4 (1/2") vertical rebar rods. Deck posts must be a minimum of 44 according to the IRC but many jurisdictions require a 66 post as a standard. The style of railing or desired look may require a different post, but for most deck railings 44 posts work well. The post collapsed on the blade and the deck/roof gave a loud crack after the last millimeter of wood was cut, holding it firmly in place. It's more about future-proofing than an imminent safety issue. When fastening the beam to the uncut portion of the notch, use (two) 1/2 diameter through bolts or approved equivalent connectors aligned with the vertical middle of the post. Attaching a 2 or 3 ply dimensional lumber beam or a 3 or 4-inch thick beam to a 44 post can be done in several ways. Everybody uses metal post caps from Simpson or USP now. Posts at the end of a beam carry less than the posts in the middle of a beam or deck, so the middle posts may need to be thicker than the end posts. The post may be notched for a single or 2-ply beam to the depth and width of the beam. Caps and connectors are fabricated to fit 44 or other sized posts, so make sure to get the correct piece. Is "wait" an exclamation in this context? Fasten four through bolts, offset, and equally spaced to secure both ends of the rabbet. The 2018 IRC altered the allowable height of a 44 post yet again. As a result, a 66 will support a greater tributary surface. I started a show a few months ago on a streaming app and I can't remember the name of it. Can I use cedar or is pressure treated (PT) lumber a better idea? Fasten the ends of each with (two) 1/2 diameter through bolts or approved equivalent connectors. Alternative approved fasteners are also acceptable. The epoxy adhesive hardens FAST. It only takes a minute to sign up. But even the best prescribed solution had the posts sitting in a pre-manufactured post base on the concrete footers flush with the ground where they could more easily rust. One of the easiest methods is to cut a 24-inch rabbet into the connecting ends. Use proper fasteners to secure caps and brackets to the post and beam. Adding a pergola to my deck; ok to replace corner railings posts with pergola posts? Copyright 2022 This Old House Ventures, LLC. Use metal hangers to attach existing lattice panels or rails to the new posts. What does the Ariane 5 rocket use to turn? What type of supports do I need for a 12'x20' deck? If the deck is going to be built near grade, contractors may feel comfortable opting for the smaller post sizes. I wanted to solve the problem of the rotted post, make the deck safe again and bring the footer up to code as much as possible without tearing everything out. 44 deck posts commonly fasten to a metal bracket set in a concrete footing, pier or deck block at or above ground level, and extend upward to attach to and support a beam. Basically, the bracket was sandwiched between two nuts and washers with the J bolt. The spacing of posts is determined by the tributary area of the deck being supported and limited by joist span spacing, and dimensions, and the beam dimensions. The length of the posts can also influence which size post will work best. I spent a good amount of time cleaning the footer. After the assembly was finished, I made sure the Sonotube was again leveled correctly and backfilled the outside of the hole with dirt to hold the Sonotube in place. The 66 is larger and checks and cracks will be more visible, however, it may not twist or bend like a 44. This can put a tremendous load onto the roof of your porch. The Tributary Area multiplied by the dead (10psf) and live (40psf) load rating, or the design load (50psf), identifies the weight the post may support. Move your old beam back over, just to, but not directly on top of the posts, slide the column caps up onto the beam, slide them into place so the lower tabs are in line with the posts and then slide the beam over the top of the posts. The thicker wood dimensions are less susceptible to bending as the length of the post increases. So, which is better? I'm from Massachusetts and I have a question about the type of wood to use for deck support posts.I have a 12'x16' deck that is 11' off the ground. 66 deck posts offer a solid, stable base for most decks. It was mounted in place by 2 1/2" #9 (10d) Simpson Strong Tie galvanized structural screws. Before I could start, I had to brace the deck to keep it in place when the post was cut. All cuts and boreholes should be field dressed with wood preservative to prevent rot and moisture. Goodman Furnace Wont Ignite: Repair Tips, Hot Mud Drywall Process: Your Complete Guide. Back in 2007, the Prescriptive Residential Deck Construction Guide based on the 2006 International Residential Code was in effect. The table below reflects the current code. How can I extend my deck posts to support a pergola? Then I used a garden hose with the nozzle set to fine spray to get the rest of the dirt off. To get the dust out of the 3" holes, I took a soda straw and held one end inside the vac hose, cupping my hand around it to hold it in place, seal it and direct the vacuum force through the straw. Raulothim's Psychic Lance vs. Cube of Force layer 4? I asked for wisdom and safety from the Lord and ran my plans by my wife's father and uncle. The main beam will sit on the 6x6 and 2" of the post will go inside the 2x10's and be lag bolted.Since it is a nice deck, I would prefer to use non-pressure treated wood so I can paint it white. This sounds like a lot of work to fix something that isn't broken, all based on a recommendation from a random home inspector. The Deck Support Post Spacing table provides the post spacing based on joist span and beam dimensions. A 44 is less expensive than a 66 of equal length. Can I stack two 6x6 timbers for a deck beam? It required a little bending, but the cardboard tube was flexible. As always, your comments and suggestions are appreciated. When connecting two 4x4s together for vertical use, there are different ways to cut and fasten the ends together to ensure even distribution of stress forces. They put the deck posts 6" deep into the wet concrete. When splicing a beam, the splice must meet in the middle of the notch. It is advisable to check your local ordinances as neighboring jurisdictions can have differences deck posts being a common difference. One of the major issues with a smaller post for the deck is notching the board for headers, rim joists, and other items. Cut and install a post between the two corner posts. To hold the concrete that would be poured on top of the footer, a concrete form tube was used. Caps sit on the post and the beam sits on and inside the upper part of the cap. It's easy to do. Post protector (or something else) to extend life of existing deck 4x4 posts? It is very important to work on ONE hole at a time. In the inside corners of the square I drilled holes into the footer with a hammer drill using a good 5/8" masonry bit to the depth of 3". Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. At the same time I realized how bad of a situation this was. Use an 18 galvanized steel post sleeve or two 18-inch galvanized steel plates. A corner post supports a 1/4 of the area defined by the joist and beam span, and an edge post supports 1/4 of two areas. A jigsaw was used to cut through the cardboard tube, but a hand saw could have been used as well. A post can even be put inside the concrete, but the concrete must be above the dirt grade and the footer must be rounded on top to allow water to easily drain away. A post may be able to support more but the code sets the limits. Secure the metal post base to the concrete pier with an expansion anchor. You'd end up with your 4x4 post looking like it's a 3.5"x6.5" post because of the two 2x4s you added to each one. Prescriptive Residential Deck Construction Guide based on the 2015 International Residential Code. They are commonly secured at or above ground level with a metal bracket to a footing, pier, or deck block, and to the beam at the other end to prevent twisting. On a very windy day, under the right conditions, the wind can blow under the deck or roof structure and lift the deck up if it is not anchored properly.
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replace 4x4 deck posts with 6x6