The process creates a more uniform coating of zinc on the fasteners, which is important with screws not to damage their threads. Mechanically galvanized is a process where the metal is spun in a mixture of zinc powder, chemical promoters and glass beads. While the steel is immersed in the zinc, a metallurgical reaction occurs between the iron in the steel and the molten zinc. Hot-dip galvanizing is the process of immersing iron or steel in a bath of molten zinc to produce a corrosion resistant, multi-layered coating of zinc-iron alloy and zinc metal. Galvanizing fastener is a process of coating with sacrificial zinc which has ten times the resistance to corrosion as steel. The other option is what the USP structural screws are treated with, and most deck screws, polymer finish. Two are galvanized base, what all the Simpson connectors have in common. There is three standard fastener treatment for ACQ lumber and exterior use. So, what is making the joist last longer is destroying the fasteners. All deck joists must be treated to survive, but the treatment is corrosive to metal. In particular, the treatment of ACQ lumber. The joist fasteners must survive all these destructive elements and more. Decks experiencing the best and the worst of our environment, from sunshine to blizzards and everything in between, are prone to corrode. Youll have the piece of mind to know that all your joists will align and your entire deck will be stronger.Īlso Check: Going To Nail School Best Corrosion Treatment Of Deck Joist Hanger FastenersĬorrosion equals life expectancy with fasteners. If you arent sure about your ability to drive a perfect toe-nail every time, opt for joist hangers. Too many nails results in a weak joist and a structure that isnt to code. One of the classic mistakes of rookie toe-nailers is driving too many nails to correct the joists alignment. If this occurs, youll find yourself having to replace a joist because of a few poorly angled nails. You can easily erode the structural integrity of a joist with a few wrongly placed toe-nails. However, toe-nailing requires more skill. Screws, on the other hand, may not be as forgiving, but their threaded shafts hold better in wood and draw boards together much more tightly and they have greater tensile strength. When deciding between nails and screws, keep in mind that nails are less brittle, so they provide greater shear strength. Others include attaching the joist to the ledger with toenails installing an angle bracket on the inside face of the end joist or smashing the outturned flange of a regular hanger over onto the end of the ledger and nailing it. Extending the ledger an extra couple of inches beyond the end of the deck so you have something to nail the flange to is one solution. The end joists on a ledger need a hanger just like the rest of the joists, but using a regular joist hanger with out-turned flanges presents a problem: The outside flange extends beyond the ledger. If you try to buy joist hangers for 2×12 joists, youll find that the common 18-gauge hangers used for deck construction top out at the 2×10 size. In the instances I looked at, the load capacities for the shorter hangers exceeded the live, dead, and snow loads required for the deeper joists, provided the joists didnt have large gaps between the ends and the ledger or beam. Keep in mind that the load capacity of the smaller hanger needs to be adequate to support the load on the joist. Usually, the hanger size is the same as the joist size, but you can use a hanger that is one dimensional size less than the joist deptha 2×6 hanger can be used with a 2×8 joist, for instance. For example, a 2×8 joist hanger is about 6 58 inches tall. Joist hangers are sized by joist depth, and run about 12 inch shorter than the nominal size of the joist. Or you could simply buy a couple of boxes of nails for $20 and still be up to code. Depending on the size of your deck, youll need several boxes of each, totaling upwards of $200 or more, just for fasteners. Youll need both the 1 ½ screws and the 3 screws. While joist hangers are a cost, the specialized Simpson SD screws are an even greater cost.
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