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One solution is to rip larger sizes of treated 2-by stress-rated material (such as PT No. When planning a deck, one begins with the sizes of the framing material. amzn_assoc_region = "US"; Diagonal braces should be installed at a 45-degree angles 24 in. Adding a 8x10 deck attached to existing deck, 2x10's, I won an inflatable 6 person inter hot tub. On the other end, the joist was supported by a stainless steel joist hanger. To measure the load capacity and deflection of a 2x2 ledger connection per the 2015 IRC, the authors assembled this laboratory test. mqLL]=*g65;$(u53UA|p%RY5'Ql2K"Q"GT1;mC|&'F\tY%1zX! <> For lateral support, three 10D toenails were installed, with two on one side of the 2x8 joist and one on the other side, per the 2015 IRC. Join in and write your own page! Another way to view the impact of nail shank corrosion is by how it affects occupant design load. Also available are colored screws to match the decking, as well as various hidden-fastener systems that are concealed beneath the deck boards. The ledger board must be located 4 to 7-3/4 inches below the door sill. TIP: If the joist has a crowna slight arc along its edgeinstall it crown-side up. The first problem is that the grade of a piece of lumber, such as a 2x6 No. After the decking is complete, its time to reinstall the siding. Any longer than that and youre dealing with special orders or adding additional footings or beams to support joists that span the distance. The frost line in southern Florida is less than a foot, while in northern Minnesota it approaches. For exterior use, we always use pressure-treated lumber for our framing. 6 0 obj 2, does not carry over to the individual pieces that result from ripping. installed per manufacturers instructions in an engineered hanger demonstrated a test safety factor well above the IRC-compliant connection. How? Some carpenters will put trim on the deck and side to that trim, or simply keep the siding off the decking 1/2 to 1 inch. There are a few retrofit options available to accomplish the post to beam. As such, neither the actual measured dimensions nor the dimensions on the treatment tag conformed to the requirements in the 2015 IRC, which specifies a nominal 2x2 that measures 1 1/2 inches by 1 1/2 inches (2015 IRC R502.6.2). Youre probably saying, wait what about the footings? We let the end of the decking run long, off the deck, and cut it later with a track saw. So it is not at all surprising that 2x2 ledger-strip nail connections to beams have a very limited useful lifetime in an exterior environment. Follow IRC code requirements when installing fasteners into guard posts. The tubes are cardboard and are easy to cut with a hand saw. Once the ledger board is level and permanently installed, we run additional rubber down the side wall and over the ledger board. It helps to know what size material you can get; for example, I know that my lumberyard carries 20 foot boards but only in the 210 sizes. Check your local codes to see if this is required in your area. That said, its important to note that within 300 feet of salt-water exposure, the 2018 IRC requires stainless steel connectors and fasteners (2018 IRC Table R507.2.3, footnote b: Fasteners and connectors exposed to salt water or located within 300 feet of a salt water shoreline shall be stainless steel). Between the loss of nail withdrawal strength due to moisture cycling, and the combined bending and withdrawal of the nails allowed by the shallow depth of the 2x2, even a full-size (1 1/2 inches by 1 1/2 inches) 2x2 ledger-strip connection may not be reliable in a typical outdoor deck application. This provides even, consistent and professional looking deck-board spacing. A deck should complement its environment, your landscape, and enhance your outdoor living space. Follow the metal connector manufacturers recommendations for fastening any metal connector in your deck. ripped board. Fastening two lengths of strapping from the outer rim joists center diagonally to the side rim joists helps to hold the deck square. x 0.148-in.). endobj Whatever your reason for building a deckfor entertaining, relaxing or outdoor living, you will need to consider materials for your decking. Install blocking in each joist bay, alternating the block along the chalk line to allow direct nailing. /Contents 4 0 R>> Once this frame is built we take diagonal measurements and use the 3-4-5 method to square the frame. amzn_assoc_search_bar = "true"; Our test assembly consisted of a 2x8 joist fastened to two 2x12s to create two joist-to-framing connections, each sharing 50% of the total applied load from a hydraulic ram. n"Fl2E``OF>HhL)- ])=`EwFp@PhMyEAdjL/Urx+'fQ!~Ez:j7s"F4RF@cdNp;H=Ras%tUVmeX+3JZ~]{>Nl{I?3{]DO)ij-@N0qY@mt3^Sdo>X0aT&FG'f=}F?Z$XK=q.{Qye0*GgXn>k/Xn#$@@aRz*,p`6Tk+sW9d^^+@4%*xU20 Use the recommended nails and fasteners for the metal connector youre installing. Guard rails can be either 36 to 42 inches high (refer to your local code for guidance). Depending on the porch load, the diameter of the hole will probably range between 8 and 24 inches. In some cases where a deck collapsed, later investigations have shown that the shanks and heads of the nails had been totally consumed by oxidation. fwoeste@vt.edu. My general rule is to use 16d galvanized nails everywhere I can. This is often helpful for decisions on size, spacing, etc. /Contents 6 0 R>> The posts should be a minimum 44 size and be solidly anchored to the deck joist and rim joist of the structure. These connections are needed to resist lateral and uplift loads. maximum railing height, they should be replaced. Based on the issues discussed and our observations, the 2018 IRC code change that prohibits the use of 2x2 ledger strips to support deck joists was a valuable change for property owners and public safety. All Rights Reserved. To reduce cost and material waste I always try to work within readily available pressure-treated lumber lengths, such as 8-, 10-, 12-, 14- and 16-ft. long boards. Before joist hangers became widely available, ledger strips were commonly used to help support toe-nailed joists, whether the joists were hung from an interior rim joist or flush beam or from an exterior deck ledger. ledger strips outlast joist hangers. Join in and write your own page! 5Ts)1 FWrd>vuxG7@G>HP^Sr9"4f YcZeX)~H,ta$Zm:p{)|VdW)E#JDNK"PGvog_ /I A`B\hliSn9s:E.cn9Sb%2\ UZaIiH,|FoXNZ(`;N@). And, after completion, the dream design can be saved, adding notes or tags, and then shared with friends. Snap a level line for quick reference (but dont put away the level!). Use two through-bolts and ametal tension tie for theupper bolt connection. /Contents 8 0 R>> 1. xXn6|W^Hq[cy$JM Recently, we load-tested 2x2 ledger strips to see how they might perform in service. Even before a 2x2 ledger is loaded in-service, the connection creates a water-trapping joint between two pieces of PT lumber. )5 You want to ensure that your deck support posts resist lateral and uplift movement. 3m'h8$SNHyTjUJrfn!s[xl|Dts5j{F>$kM xFcy'w'wBVv@40c9yo:g%+S'va=T}Z`|SvGe}1.S4`lO{;D|>ba|nww?}! \I'KjK4@7$,'e|t3 !tVBIQ9RSDWFQF89Q7 This rule also assumes you are spacing your joists 16 inches on center. amzn_assoc_region = "US"; I have been told that current codes require joist hangers to be used. 2, and the third as No. Typical of commercially available stress-rated pressure-treated 2x2 southern pine, this nominal 2x2 purchased at a lumberyard measures 13/8 inches by 13/8 inches, while the treatment tag reads 1.3125 inches by 1.3125 inches. It is the first board to be installed because it sets the base for the rest of the deck. diameter galvanized bolts and washers for which I drill 17/32- to 9/16-in. 12x 20 on both sides of the house. Anchor bolts are designed to resist post movement and deck uplift from high winds. For example, if the diameter of a 10D common nail is reduced by half due to red rust, the nail design load capacity is reduced to one quarteror 25%of the original value (see graph, above). My inspector wants to see deck footings 48 inches deep. The DTT1Z addresses a new 2015 International Residential Code provision (section R507.2.4) that allows four 750-lb. For example, on a 210 take 10 and add half of that (5) to equal 15. A concrete footing helps support the weight of the deck by spreading out the loads created by each post over a wider area. I've seen lots of amateurs build better than that. deviation from one another is allowed by code but should be avoided. The steps you should have a consistent tread depth with a 7-3/4-in. Now is the time to clean up your tools and celebrate. For better visualization you can join the spikes with string to show the perimeter of the deck. Starting out in the 2D section, an iPad user can choose any of five home scenes, and mix and match products, designs and colors to customize the scenes. We then add additional temporary support legs and start digging the footings. Layout of a deck sometimes starts on that proverbial napkin drawing and needs to be transformed into reality. :pnU #BGgY:7AX.rVWG|d bYW:iifo,W#2}r QYp;TYpl%A:X;&p3a"m!~ELDE PO9R,wD|,[@OZh 'hA(efZ7ROJ|}P Composite decking has the beauty of wood without the concerns of splintering, rotting, maintenance or weather damage. We use scrap lumber as legs to hold the two rim joists level and then attach and outer rim joist (opposite the ledger board) to complete the perimeter frame. Based on published nail design load values, a 10D (3-in. sphere can not pass between them. The frost line depth is not consistent around the nation because there is such a dramatic difference in climate from state to state. Our objective wasnt to test the capacity of the joist hanger connection. Additional metal connectors can be used to connect stair stringers to the deck frame. endobj To learn more about the app, visit www.azek.com. Most deck footings these days are either poured in place or precast. As anyone who has ever shattered a baseball bat can tell you, localized grain deviations are hard to detect and can greatly impact strength. amzn_assoc_marketplace = "amazon"; Install the blocking flush with the top of the deck frame. Neither the measured nor the tag dimensions conform to the nominal dimensions of a 2x2 specified in the 2015 IRC. Loads were applied by a hydraulic ram controlled by a uniform downward movement, allowing the load value to peak and then fall off to a much lower value. We use our speed squares to space the deck boards from each other during installation. The DTT1Z deck tension tie is a safe and time-saving alternative that eliminates the need to access floor joists from inside the house. Local codes were created to keep us safe, and many existing decks do not meet current safety codes. I lay out the deck using 12-in. <>>><>>>] This often is determined by the joist span needed. Clearly, when the shank diameters of the nails holding a ledger strip in place are reduced by 50% due to red rust, the ledger-strip-to-joist connection is well beyond its useful lifetime. As can be seen by the separation between the joist and the ledger after completion of the load test, a supported floor and ledger would have collapsed under a gravity-type loading, such as the load produced by deck occupants. Often times scrap materials from your framing lumber may be used for blocking; we often use joist cut-offs. In this article we demonstrate the proper techniques for building a small, simple, low-to-ground deck. -k|mUl4n:-R Rule of thumb for joist span: Take the depth of the framing member and add half that number to determine a rough footage estimate for the decks joist span limit. "o:br6DQ|N?Lf;?X(6?g?vwC&&pnb2 +&|/THVNIY|U]! Definitely don't build like that. In many locations along a ledger strip, the nail shanks between the 2x2 ledger strips and the face of the beams or rim joists were totally red rust, indicating that the nail connections no longer provided load support for the joists bearing on them. If you calculate the weight of the entire deck, the furniture placed on it and the combined weight of a large group of people who might be standing on it, you will be shocked at the number. But according to information from three SP lumber inspection agenciesSouthern Pine Inspection Bureau, Timber Products, and RRA/Southeastern Lumber Manufacturers Associationas well as our own observations at big-box lumber outlets, stress-rated nominal 2x2 pressure-treated (PT) lumber has not been available in the marketplace for a number of years. amzn_assoc_title = "My Amazon Picks"; We used 12-in. Deck safety is a real problem. The wider base also helps prevent frost heave from lifting the deck. In this situation, the soil under each deck footing may be called upon to support 3,000 plus pounds. I think I might be over-engineering this but I live in CT and I'm also worried about snow weight. Roofing nails, screws and box nails have no place in any metal connector system and should be avoided and replaced at all costs. If your deck is more than 30 inches off the ground it requires guardrails or handrails. You can determine this by using an approved manufacturers product data based on the dimensions of your joists or header. 4 0 obj With the new app, its easy to turn dreams of outdoor living spaces into visual reality with a simple tap or swipe using five different product scenarios. By not including the detrimental impact of 2x2 rotation on the nail connection load capacity, the residual strength of a nail connection can be calculated by assuming that the diameter of a steel nail shank at the 2x2-to-beam interface is reduced by a certain amount. As we applied a load to the test assembly (46), we were particularly interested to see the counterclockwise rotation of the 2x2 ledger strip, which created a pronounced V between the 2x2 and deck ledger (or support beam). #SJj amzn_assoc_ad_type = "smart"; @r8:UEc+^jpF2b8.Ib( mFbzGe/-CL\M`{/T?6\m,F5F* Composite decking is simple to maintain and offers superior stain, fade, scratch and mold resistance. I use for building. Easy Code-Compliant Solution for Attaching Decks to Homes. Deck posts should be 46 pressure-treated lumber and have galvanized or stainless steel connectors attaching them to the rim joist. endstream This requires accessing the basement rim joist area. We then square one end of the first deck board and install it flush over the 3/4-in. amzn_assoc_ad_type = "smart"; We wanted to test PT ledger-strip connections that were in the wet condition (not kiln-dried after treatment), as might be used by a DIYer or contractor. xX]s8|_1wU*eMvs$A0 hYg@Rr3__hL~lyOwOO+ZggTO?g+X-jjF&4UQq).IYULIM/2rb Learn more at www.strongtie.com. After the ledger is temporarily fastened to the house, we go back and install permanent fasteners. amzn_assoc_linkid = "e460c52c4a6fb230554ebb90fb2f96ff"; amzn_assoc_asins = "B0B3F5RNJ7,B07R8WGQGM,B00VTVUSM4,B07QS52LQL"; amzn_assoc_placement = "adunit0"; Joists typically extend from the ledger-board connected to the house. The practical question is, what is the useful lifetime of a 2x2 ledger-strip connection to a deck beam in a coastal environment? For example, if half the 0.148-inch diameter of a 10d common nail is lost due to red rust, the nails In a nutshell, a code requirement for a product that is not (apparently) available in at least one region of the country is not a good situation for DIYers and contractors. 5 0 obj When choosing deck lumber based on joist span, I use the following easy-to-remember rule of thumb that works for most of the treated wood species that. After ensuring that the sheathing is structurally sound, we cover the area above and below the ledger board location with self-adhering rubber. Improperly built decks can be dangerous. I start all of my decks by determining the length of the ledger board. diameter footings on this deck. Im a bit unconventional with my footings. But now builders commonly use joist hangers, and while ledger strips are still OK to use in interior applications, the 2018 edition of the IRC no longer permits their use on exterior decks (2018 IRC R507.6.1). The second problem is that ripping treated lumber exposes at least one and in some cases two largely untreated surfaces. A user can even invite others to experience it. The diameter of the holes for your footings especially large ones, create significant concentrated loads within the soil. Larger diameter footings spread the weight out over more soil area. We accomplish this by using tar paper and staples on the joist tops, or a rubber membrane. A free new app, the AZEK iPad App, provides the power to reimagine home and outdoor living spaces in realistic 2D and 3D renderings. AZEK Building Products is making it easier than ever to visualize new deck, railing, paver and trim products on a home. NqkI}?^(:Y1[2acAja5OZSv+6M~i(4X\Vmq7wWqs nail load-rated for 90 pounds in southern pine in a deck application would be rated at 22.5 pounds when the nail shank diameter was reduced by half at the 2x2-to-beam interface. We are not aware of issues with 2x2 ledgers used inside residences in dry conditions; however, a word of caution is warranted for the possibility of high moisture exposure for the ledger connections, such as in an improperly maintained crawlspace. We anticipated that this would happen, due to the fact that the depth of the nailed 2x2 ledger strip was only 1 3/8 inches, allowing it to rotate because it wasnt laterally restrained by other rows of nails. This area will later also receive a copper, galvanized or PVC ledger flashing cap. But our testing has shown even more compelling reasons to not permit 2x2 ledger strips outdoors. The reality is that the last board usually gets ripped to size, and we hate installing a 1- to 2-in. amzn_assoc_search_bar = "true"; Once we locate the ledger board height, we level it and temporarily fasten it to the house with 16d galvanized nails. On one side of the assembly, a simulated 2x8 joist was supported by a 2x2 ledger strip nailed to a 2x12 with four 10D (3-in. <> The best source of information regarding your frost-line depth is your local building department. Some brands come with matching, colored plugs to conceal fasteners. Joist hangers must meet IBC and IRC code of downward capacity. SV{jAX@t} b%rG*?rMjgD9)-F#F0Xb>sIpm=Jc}z?6AU_)=ZkW*viKV-aVm AT* yjD>E[Erry_:S&85tO/N#I%=~JCNRq J!)v){u mQwFW@dP2$O /r_V D}PYI>& (5DcP3ebE)K=)lD8{3M Jc.>3BBg,\$RY ydyy=fkBI@K-y^U1[mX\_.+Q+%F/7mu Probably the most commonly used technique is to install small pieces of material in between the joists to help prevent deck bounce and also to increases the strength of the rail post attachment. As the load on the joist increased, substantial rotation of the ledger strip was evident, as indicated by the angle (bottom right in photo) between the 2x2 and the deck ledger. This method gives the appearance of all full boards at the house. I use 1/2-in. for a 36-in. <> amzn_assoc_linkid = "e64acee35ad75623b63a20b5b7748419"; Either way, the temporary supports will hold the deck in place until we install and connect the deck posts to the footings. Stepping down 7 inches onto the deck reduces snow buildup and rain splashing and getting in under the house door. On some of our decks we use composite deck boards. Once the footing is cured we install support posts. Once you have determined your joist size, use this size lumber for all components of the deck frame, ledger, perimeter rim joists and blocking. lateral connections from the deck to the floor joists within the house. On the other end of the assembly, the joist was supported by a Simpson Strong-Tie 316 stainless steel LUS28SS joist hanger and ring-shank 316 stainless steel nails (SSA10DD 3-in. I prefer to build the outer perimeter or the sandbox frame as we joke on the jobsite. This will only get worse (and more dangerous). The ledger board attachment supports one end of the deck and bears about half the weight of the deck, the other half borne by the posts and footings. For example, if three 2x2 pieces are made from a 2x6 and regraded by an experienced grader, one 2x2 might be graded as cull, the next as No. I have a large deck. endobj On the other hand, as the photos below show, when the hydraulic loading ram was lifted from the assembly, the ledger-strip connection had clearly failed. How? Use hot dip galvanized joist hangers, use 2x8 joists and if you really must go with 2x6 because you need to be lower to the grade then decrease joist spacing to no more than 12" on center. stream We then install all of our perimeter trim on the rim boards prior to applying decking. He is also the editor of a www.AConcordCarpenter.com. diameter sphere to pass through. As a practical matter, ledger strips used outdoors are required to be pressure treated, typically southern pine (SP) in the mid-Atlantic and Southeast. amzn_assoc_tracking_id = "eht1-20"; Once the ledger is attached to the house we install a rim joist on either side and one rim or beam opposite the ledger. Because of the impact of salt corrosion on commonly used galvanized nails, a major safety concern has been the use of 2x2 ledger strips in a salt-water environment. Follow the manufacturers recommendations for fastener length and placement. Once the home has been customized, it will be easy to imagine how a family might enjoy their outdoor spaces. 7 0 obj Should You Consider Switching to Cost-Plus Pricing? If a decks guard-posts anchoring does not have a minimum allowable tension load of 1,800 lbs. maximum riser height. M~Ge;jki TU%y(/ fqI X7( If a visualization marker isnt available, Virtual Reality (VR) mode can be used to view and customize the AZEK home in 3D. 3 0 obj There are no inspectors in our area. amzn_assoc_placement = "adunit0"; This is a 2000 square ft. deck & they have just begun, so I need to know if this is up to codes. Simply click here to return to Framing and Decking Forum. To avoid this, we rip the final three or four boards down 3/4 to an inch and install them. While the 2015 IRC and earlier editions require field-cut ends, notches, and drilled holes of preservative-treated wood to be treated in the field in accordance with AWPA M4 (2015 IRC R317.1.1), the language does not cite edges for field treatment. Thus, under the previous IRC editions, contractors were faced with a supply issue. We install a metal or PVC flashing cap over the ledger board using roofing nails, and only place fasteners high up on the flashing. If your deck has wood support posts and a ledger board that is bolted to the house, the deck posts holds up approximately 50 percent of the total weight. After exploring the two-dimensional visualization and customizing the product color schemes, the user can then take the design to the level of cutting-edge 3D technology to bring an entire house to life. When we measured the cross-section dimensions of the nominal 2x2s with a tape, they averaged 13/8 inches by 13/8 inches (1.375 by 1.375), while the treatment tags on the ends indicated that the 2x2s measured 1.3125 inches by 1.3125 inches. Every year we hear about decks that collapse under the weight of people or snow load. Editors Note: Robert Robillard is a remodeling contractor based in Concord, MA. They can be retrofitted with a tension tie, through-bolts and or blocking as needed. c|KrKTV o{@mhke%O vf" ZW"$Mv2;4\VAf7whlw\z(J^ h"C1z;`*M#&>Ni8l3]N((gebw!Ir9&Y#Qc:=Y+gHnh_{ vmfz5F"*Ek2Z2(%%}(=nl+&)lu9VP3j#M"HQ3{ipx "2>gPzo>p4[Lgwf20?$0VQ:t=e%$)qf Like the maximum spacing for balusters, this is intended to prevent small children from getting stuck or falling through. Once installed the plugs almost disappear. Your deck, therefore, should ideally complement you and your lifestyle. We start left to right and mark out the ledger and outside rim joist 16-inches on center in a square line. mJx:&p?8xg!3f|i>P701&MT3uc,Azox/S \PNyf YLRjR8OFpaC*.XOfp).S[\"q=} Before the vertical load was applied to the test assembly, the 2x2 ledger strip was snugly attached to the simulated 2x12 deck ledger. temporary board. Check your local building code to confirm fastener spacing in your area. 4m'Exom>9X~3m amzn_assoc_ad_mode = "manual"; In the meantime, you may browse the digital edition. A more effective approach would be to support the joists with a much deeper member, such as a 2x6, nailed along both the top and bottom edges. In the AR experience, a 3D home appears and the user can personalize the house, rotate it 360 degrees, change product colors and then zoom in to make sure its perfectly designed. /7_9V gaZqxaVEv[jIeXmEon[%n OnK|ZVR+ G[I: If the stairs have an open riser they should not allow a 4-in. overhang on the deck surface, we first temporarily face-nail a 3/4-in. This is accomplished using hardware connectors that tie the deck into the house to protect against lateral stresses from wind, seismic or people on the deck. In a perfect world a full-width board would drop into place, and the deck would be complete. To achieve a 3/4-in. A ledger board is the part that attaches the deck to the house. endstream x 0.148-in.) I am having a deck built & several people have told me that it is not being built to current codes. With a header to the house and the deck was built 6, I'm putting a swim spa into an inground concrete bunker and will build a deck around it. Frank Woeste is professor emeritus at Virginia Tech University and a wood construction consultant. I have been advised to keep the deck joists a minimum of 6 inches. For decks more than 30 inches off the ground,railings are critical safety features. The new Strong-Drive SDWH Timber-Hex HDG screw with an integral washer attaches the tension tie to the supporting structure with a minimum of 3 inches of penetration. <>>>] In my neck of the woods I always try to install my ledger board so my finished deck height is 7 inches below the house interior floor. As red rust attacks the shank of a steel nail and effectively decreases its diameter, the design load capacity of the nail decreases accordingly. Use washers at the carriage-bolt head and the bolt nut. Next, its time to install the joists. When poured in place most folks use footing forms from Bigfoot Systems, Sonotube or an equivalent concrete form. x 0.148-in.) Since the typical total design load for a residential deck is 50 pounds per square foot (10-pound dead load plus 40-pound live load), the assumed 50% reduction in shank diameter reduces the total floor-design ledger-connection load to 12.5 pounds per square foot, meaning the weight of the dead floor plus occupant weight would be limited to 12.5 pounds per square foot. It's easy to do. The horizontal balusters and railing design, surrounding the full length of the staircase, is visually unique when compared to the traditional vertical baluster design of most []. We snap a chalk lines across the joists to lay out blocking. <> I sometimes leave the strings up for a few days and ask the client to walk around, place furniture, etc., to make sure they like the size or shape of the deck. Home Newest Articles How To Build a Code Compliant Deck. Since we did not design a beam in this deck, the outside rim joist is then tripled, and is supported by the deck posts. We went to our local big-box lumberyard and purchased dimensional PT framing lumber and 2x2x8s for our testing. /Group <> When we get to the last few deck boards next to the house, we measure and to determine the width of the very last board. A Dozen Ways to Strengthen Your Remodeling Brand, The Empire Group Plans Large Build-to-Rent Community in North Phoenix, The Most Affordable Places to Retire in America in 2022, Yardi Matrix Reports Institutional Investment in Single-Family Rentals Is Rising, NAHB: Proposed Schumer-Manchin Legislation Could Affect Builders, New Conservation Community Lagoon Valley Materializes in the Bay Area, 7 Ways to Prepare Your Team to Sell in an Uncertain Market. 2022 Extreme How-To. x 0.148-in.) TJDp9 !P]}UrPE1b-w)Ku keWa9*%k+BOjCXRd_=6%3&U-H;7 $C']y8ecda |[DA(e4L0B3h^2q>LL'^ew NU"Tum%Fx..&h'~5h~VkpXY6xOj2'DvLF#Po-+s/8;vW.&wO22x61Er Depending on where we are on the project, I might install the joists before pouring the footing or vice versa. d# All rights reserved. The DTT1Z fastens to the narrow or wide face of a single 2x with Strong-Drive SD Connector screws. From inspired deck and railing designs, trim and molding applications, porch colors and paver layouts, the app places the power of creative outdoor visualization in any users hands. The rule of thumb says that 15 feet is your maximum allowable span for a generic 210 deck joist. stream A 3/8-in. NdZ8'z High moisture conditions open the door to wood decay, and that outcome alone would weaken ledger-strip nail connections, thus lowering load capacity for occupant live loads. design load capacity (90 pounds for wet use) would be reduced by 75%, with only 25% capacity remaining (22.5 pounds). This rule is not a substitute for a proper table of spans and sizes of framing lumber, but is helpful in over-designing my joists during the early phase. Prior to installing a ledger board you first need to remove existing house siding and trim from the house to expose the sheathing.