Choosing deck fasteners and hardware, such as joist hangers, used to be pretty straightforward. Afterall that changed with the phase out of CCA-treated lumber and the introduction of a new family of wood preservatives for pressure-treated lumber. The failure of a joist hanger or deck ledger connection can have catastrophic results such as a deck collapse. New Preservatives and Corrosion.Rimworld dev mode change age
The increase results from higher concentrations of copper, which is corrosive to steel and other metals, and the removal of chromium and arsenic, which helped suppress corrosion. Most treated yellow-pine, the dominant treated wood in the eastern and central U.
Other than the treatment chemicals use, several other factors affect the rate of corrosion, but moisture is the most important. Since water is necessary for corrosion to occur, the wetter the environment and the closer the fasteners are to moist ground, the faster metals will corrode. Salt air and spray in coastal and environments significantly speed up corrosion.
So a joist hanger on a seaside deck is going to rust away much faster than the same piece of hardware on a bone-dry deck in Arizona. The concentration of preservatives in the wood also has a big effect. These problems have spawned the development of a wide array of coated and heavily galvanized hardware rated for contact with ACQ- and CA-treated wood.Skipped frames due to encoding lag nvenc
For any hardware exposed to these chemicals the standard G galvanized steel fasteners and connectors have been upgraded to more expensive protective finishes: either G galvanized, proprietary polymer-coatings, or stainless-steel — the best and most expensive option. Hot-Dipped Galvanized. Remember, however, that all galvanized coatings are sacrificial.
They are designed to slowly wear away to protect the underlying steel. Once the coating is gone, the steel will fail quickly. Manufacturers will not guarantee any specific lifespan because there are too many variables.
Most common are polymer coatings over a thin electrogalvanized finish. The coatings protect the metal by keeping water and dissolved copper away. Because the coatings are thinner and more slippery, they make much better decking screws. Also these coatings can be applied to tempered steel, not an option for hot-dipped galvanized fasteners which would undo the tempering.
Simpson HU2.1/11 Face Mount 2-1/8" x 11" I-Joist Hanger - G90 Galvanized
Polymer coatings can also be used for steel connectors with large surface areas, such as joist hangers and other connectors widely used on decks.
Simpson offers polymer coatings on screws and bolts, but, not on connectors. There are now dozens of fasteners on the market with an endless variety of proprietary coatings. Evaluation reports are widely used by manufacturers of alternative products to demonstrate their compliance with building code standards. Stainless Steel. Type is suitable for all above-ground applications.
Type is recommended in areas subject to salt or salt water. Stainless steel is the best choice near fresh or salt water, in any damp location due, or in areas subject to salt-water spray or deicing salts. Because of the high cost, you might consider stainless steel just for critical joints such as bearing beams and safety railings. In marginal situations, where conditions are uncertain, you should consider upgrading to stainless for the peace of mind.
It may add a few hundred dollars to the cost of a project, but a relatively small percentage overall. Do not use aluminum fasteners, connectors, or flashings in contact with pressure-treated wood. Where fasteners such as nails, bolts, or lags are in contact with metal connectors, use the same metal for both.
DECK FASTENERS & CONNECTORS
If a joist hanger or other connector never touches the treated wood, then copper ions should not attack the galvanized coating although a small amount of water dripping from above could still be a concern.
Simpson has tested this concept using Grace Vycor Deck Protector. Decking Screws.Nails placed in all holes guarantees full capacity. If the designer does not specify otherwise, always use full nailing. Partial nailing can be used only if the designer clearly marked it in the specification. Number of nails in the secondary beam: Every second hole and the top and bottom holes of the hanger should always be nailed.
Unless otherwise specified The number of nails in the main beam should be used for all holes near the bend of the joist hanger flange.
Partial nailing is used in situations where it is not necessary to achieve a full load carrying capacity. Thanks to this type of installation we can reduce the number of nails in connection and thus reduce its cost as well as accelerate the assembly of the joist hangers. In addition to checking the ultimate limit state, the joist must be prevent against rotation on the support. Connectors dedicated for I-beams are unique and special products.
The users have to pay special attention for notes and additional information included in the chapter.
One of the most common misinstallation is improper fasteners selection. For standard solid connectors standard fasteners are 4,0 CNA nails.
For I-beam products N3. Usage of correct fasteners ensures proper installation and achieve published capacity. US Patent: 5, Double Shear Nailing The nail is installed into the joist and header, distributing the loadthrough two points on each joist nail for greater strength.Destiny 1 trials stats
Positive Angle Nailing Provided when timber splitting may occur and to reduce installation time. Speed Prongs Used to temporarily position and secure the connector for easier and faster installation. Round Hole: To fasten a connector. Always fill and make sure to use the correct nail. Fasteners installed at any angle.
Triangle Hole: Sometimes provided in addition to round holes. Fill triangular holes when specified. Connectors technical notes. The conical extension of the stem under the head guarantees that the nail or screws fills the hole in the timber connector.Ryobi chainsaw 18v
Exact force transmission is therefore ensured. Chemical and mechanical anchors are characterized by fast assembly and high load capacity at short distances between anchors and short edge distances. They are mainly used for fastening in smooth and hard substrates, i. The anchor is designed for fastening in the range of medium loads of building construction elements.
Fasteners technical notes. Contrary to the basic product range where CNA4. The use of these nails guarantees the correct execution of the connections and ensures that the declared capacity of the connection is maintained. Please pay special attention to the additional information and notes in the product description. One of the more common mistakes made is the selection of incorrect nails. Do not use CNA4.
Most models can be installed filling round holes only, or filling round and triangle holes for maximum values. The Strong-Tie HU2. NOTE: The correct fasteners installed in the correct position must be used to achieve published load values.
You are false away from free shipping. SKU: HU2. Quantity Unit Price Save. Add to Cart. Details Simpson Strong-Tie HU hangers are heavy duty connectors designed for schools and other structures requiring additional strength, longevity and safety factors.
Use all specified fasteners. Web Stiffeners are required for all I-joists used with these hangers. Allowable loads are the lesser of the values in the Hanger tables or the weld capacity. Details Specifications Done. View Spec Sheet.Register Log in. By clicking GO! Attaching Joists with Hangers. Codes typically call for attaching joists with joist hangers at the ledger. They are sometimes not required at the header if they rest on a nearby drop beam and you drive nails through the face of the header into the joists.
But even in that situation, some inspectors will want to see joist hangers. Installing joist hangers is simple in principle, but they must be attached with care so that the top of the joist ends up perfectly flush with the board it attaches to—or flush with the ledger flashing.
Some builders like to install the board first, then the hangers; others install the hanger first; others partly install the hanger, then insert the joist and finish installing the hanger. Here we present four different methods. You may end up using two or more methods, in different situations. Joist hangers typically have barbed tabs that you pound in to hold them temporarily. Some people like to use these, while other find that they do not hold well enough to be reliable. Hanger Nails. Use short joist-hanger nails to attach the hanger to a ledger or a single header.
Longer nails for the sides. When driving through the sides of the hanger, use longer nails. Make a Scab Guide. Method 1: Start by making a scab guide: Screw a short piece on top of a section of joist material. Drive the tab. Rest the guide on top of the board to be fastened to or the ledger flashing. See that the guide is aligned with the layout line, so it is straight vertical. Drive Nails.Going to be extending my roof by 8' over the front porch in a few months. Just stick with nails?
Originally Posted by Trapper Dahlgren. Since these will be loaded in shear, use nails. There are special screws made for joist hangers. I think they are call strong-drive. I have used them for deck joists but you could check to see if they are code for roof joists. It's about the shear strength for joist hanger nails.
Those short stubby nails made for joist hangers can withstand a tremendous amount of shear before they break. Most screws do not have that level of shear, not even close.
Money cannot buy you happiness, but it can buy you a trapping license and that's pretty close. Originally Posted by maintenanceguy. Make sure you use the correct nails described by Jabne.
If you want to use one that calls for screws - good luck finding them - most I have read about call for nails for the designed sheer strength. I would not want to cut any project short to save a few bucks knowing it is not built to specs as designed.
Originally Posted by l1ranger. BackroadsRevised etsy. There are special screws made for using hangers otherwise nails are the proper fastener, and the hanger will have a specific nail size too. Regular screws don't have the shear strength. They're more brittle to begin with, and a nail and a screw with the same outside diameter won't have the same strength, because the screws threads don't provide as much strength as the solid nail. That being said, when I rebuilt my deck I used regular screws from the hardware store labeled "structural screws" because it's easier and I didn't know any better at the time.
Your mileage may vary. Originally Posted by TreedaBlackdog. I should add - every hanger will also have an engineered load design based on the number of fasteners used. You can not just put a single nail into one and assume its good.
You need to follow again what it calls for.Horizontal black lines on copies ricoh
It might be nails a side to displace the weight where a single nail could possibly hold it up - it will not meet specs. If your joists are sitting on a foundation I dont see shear strength being a factor at all. I always use the Simpson screws. Originally Posted by Boco. Rafters are under compression. The weight of the roof itself should hold them in place. I'd use what the engineer recommends. If you are concerned with nails pulling out, perhaps you could use ringshanks.
If you are concerned with the nails rusting out, perhaps you could use galvanized nails. Talk to your engineer and go with their recommendation. The hangers will only be as strong as the ledger board and how it is attached also.
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Why Is Community Resilience Important? New Wood Construction Connectors Catalog. Structural Steel Connections. Get more information.This joist hanger is made from galvanized steel and can support a significant amount of weight when installed correctly. Are these steel joist hangers approved and will they stand the test of time?
Is there a right and wrong way to install these framing connectors? Is there a way to build without using joist hangers? Sally P. These metal framing connectors have been around for years and they're code approved. The latest advice from the top metal framing connector manufacturer in the USA, Simpson Strong-Tie, is to use structural screws instead o f nails.
All too often rookie carpenters or do-it-yourself homeowners will install joist hangers using roofing nails. Not only are the shafts of roofing nails too small, but the heads of roofing nails can also easily pop off when subjected to low amounts of tension. Most of the manufacturers of high-quality joist hangers sell their own approved nails.
The labeling should show that the nails are approved for outdoor use and have the level of protection on them. The new advice to use screws instead of nails is simple. Over time nails can loosen and work their way out of the wood. This happens because of the repeated wetting and drying of the treated wood. Wood is hygroscopic and expands and contracts when it gets wet and then dries out. If you use approved structural screws instead of nails, the screws will stay snug in the wood.
I show you in this video the structural screws and how they go into a typical joist hanger. I can see why you might be concerned about the joists pulling away from the house. The small metal shelf or seat at the bottom of the hanger that each deck joist rests on seems insufficient. If your carpenter used high-quality decking joist hangers and the correct nails, you probably will have no problems.
As these nails are installed on each side of the joist, they create an anchoring effect because the nails are driven at opposing angles.
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