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Mastered in a Minute

How to Install Joist Hangers

Joist hangers are almost always required when building a deck—here’s how to install them correctly.

By Matthew Millham
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      With each passing year, there seems to be more and more metal hardware required in home building. And even if it’s not required, it’s often best practice to make your connections with metal. The good news is that not only are connector manufacturers improving the safety of our homes, now they’re helping with aesthetics too. Some hardware can now be used to add style. Or, on the other hand, you may be looking for more subtle, hidden hardware. Well, that’s available as well. What’s not new, but ubiquitous, and something every builder needs to know how to work with, are joist hangers. When it comes to building decks, joist hangers are nearly always used. So knowing how to install joist hangers is an important skill for any builder.

      Video Transcript:

      Begin with a joist hanger sized for your joists—this is typically marked on the packaging—along with the correct fasteners to use when installing. The joist hanger in this video calls for 10d common, galvanized nails. To install, start by aligning the top plane of the joist with the top of the rim joist. We’re using a scrap of wood screwed to the joist as a brace to hold the joist in position while we fit the hanger, but you can also use a nail bent over to form a hook. With the joist in place, snug the hanger up under it, squeeze the sides of the hanger tight to the wood, and hammer the two prongs into the rim to temporarily hold it in place.

      Fasten the rim side first­, nailing through all the predrilled holes on both sides of the hanger. If space is too tight to swing a hammer, a pneumatic palm nailer can be used. Finally, toenail into the joist through the predrilled angled holes into the rim joist. Be sure to put a nail in each of the holes on both sides of the hanger. Then, remove the guide block, and the installation is complete.

      RELATED STORIES

      • Installing Joist Hangers
      • Joist Hanger Helper
      • How to Install Deck Joist Hangers
      Previous: Build a Grade-Level Deck: Joists and Hardware Next: How Far Can a Deck Joist Span?

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      View Comments

      1. CT_Yankee | Dec 24, 2018 02:35pm | #1

        What is missing here is a tip about positioning of the joists framing into engineered lumber (EL). A timber joist will shrink substantially along its height - EL (LVL, LSL, etc.) will not. Joists should be set higher than the supporting EL to allow for this shrinkage. This avoids the inevitable bump in the floor a few years down the road as the top of the timber joint shrinks to below the supporting member.

        1. user-6991658 | Mar 04, 2019 10:48pm | #7

          How much higher above the rim should the joist be placed?

      2. Paul_V | Dec 24, 2018 09:37pm | #2

        It can't be stressed enough that you have to use the correct fasteners, and they need to be properly galvanized or stainless. At a rental house I was staying at, the deck (which had a hot tub on it!) had joists with drywall screws in the hangers. Needless to say, once I saw that, I did not use the hot tub nor spend any time under the deck. It's only a matter of time before that deck fails catastrophically.

      3. LauraWilliams | Jan 15, 2019 04:57am | #3

        Nice idea!!

      4. DeweyMessier | Jan 16, 2019 02:52am | #4

        Very nice sir!!

      5. BenjaminShaw | Jan 17, 2019 05:25am | #5

        Yes!! This is the best idea!

      6. Close_Enough | Feb 08, 2019 07:43am | #6

        What about Teco Nails?

      7. RonaldTague | Mar 08, 2019 02:03am | #8

        really good

      8. JohnMartin12 | Mar 09, 2019 03:27am | #9

        amazing

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