![]() ![]() The flanges on regular joist hangers interfere with the bolts used to install 1,500-lb. I usually install these hangers with connector screws, so to account for the extra thickness, I trim the joists short by 1⁄4 inch.Ĭoncealed-flange hangers are also handy for the deck joists where lateral load hardware will be installed. To account for the thickness of the hanger flanges and fasteners, you need to trim the joists that rest in concealed-flange hangers slightly shorter. Unlike regular hangers that can be installed after the joists are placed, concealed-flange hangers must be installed first and the joists dropped into them. Others include attaching the joist to the ledger with toenails (a practice not permitted by the IRC) 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 (a practice definitely not supported or approved by manufacturers).įortunately, several years ago hardware manufacturers introduced “concealed flange” (in-turned flange) hangers, on which the ledger flange is bent inward towards the joist pocket and concealed by the joist when it’s installed. 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 2x12 joists, you’ll find that the common 18-gauge hangers used for deck construction top out at the 2x10 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 didn’t 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 depth-a 2圆 hanger can be used with a 2x8 joist, for instance. They can also be used to avoid conflicts with lateral load hardware. For example, a 2x8 joist hanger is about 6 5⁄8 inches tall. Joist hangers are sized by joist depth, and run about 1⁄2 inch shorter than the nominal size of the joist (you can size deck joists by referring to Table R507.6 in the 2018 IRC, which lists spans for deck joists sized from 2圆 to 2x12). ![]() Or, you can read this article, in which I’ll cover the basics. But hangers don’t come with printed installation instructions you need to search through a maze of technical notes, installation notes, load tables, product information, fastener information, and more to uncover everything you need to know in order to select and install joist hangers-and the joists that rest in them-properly and safely. If they aren’t sized correctly and installed properly with the right nails or screws, the deck won’t have the necessary load support, uplift capacity, and lateral rotation resistance. Joist hangers are not the most visible part of a deck, but they are one of its most important components. ![]()
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