Safety glasses
Use it for: Protects your eyes from rust flakes, metal chips, and falling debris while removing old fasteners.
Shop safety glassesDeck hardware repair
How to Replace Deck Joist Hanger Fasteners
If a joist hanger has loose, rusted, bent, or missing fasteners, you can usually replace them one at a time with the correct structural connector fasteners and tighten the hanger back to the framing.
This repair is straightforward when the hanger itself is still sound and the wood around it is solid. The main goal is to use the right fasteners in the right holes without letting the joist shift while you work.
Before you start: Match the joist size, hanger style, hole pattern, and approved fastener type before ordering. Do not substitute common deck screws for hanger fasteners unless the connector specifically allows them.
Safety first
- Wear eye protection when pulling old nails or scraping rust from metal hardware.
- Support any loose joist before removing multiple fasteners from one hanger.
- Do not substitute common drywall or deck screws for joist hanger fasteners unless the connector specifically allows them.
- Work from stable footing and avoid reaching under a loaded or visibly sagging deck section.
Tools you may need
Hammer
Use it for: Drives approved joist hanger nails and helps tap out stubborn old fasteners.
Shop framing hammer
Impact driver or drill
Use it for: Installs approved structural connector screws if your hanger allows screws instead of nails.
Shop impact driver kit
Pry bar or nail puller
Use it for: Removes old nails without tearing up the hanger or surrounding wood more than necessary.
Shop nail puller tool
Temporary support block or clamp
Use it for: Keeps the joist from dropping or twisting while fasteners are out.
Shop bar clamps
Flashlight
Use it for: Helps you inspect the hanger, wood fibers, and hidden rust in shaded areas under the deck.
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Step-by-step fix
Step 1: Confirm this is the right repair
- Look at the joist hanger where the joist meets the beam or ledger and check for missing, loose, badly rusted, or obviously wrong fasteners.
- Make sure the metal hanger is not torn, badly bent, or pulling away from the framing.
- Probe the wood around the hanger holes with a screwdriver. It should feel firm, not soft or crumbly.
- If only the fasteners are the problem and the hanger and wood are still solid, this repair makes sense.
If it works: You found a hanger with fastener problems, but the hanger body and surrounding wood still appear usable.
If it doesn’t: If the hanger is intact and all fasteners are tight and corrosion-free, the movement or sag may be coming from another deck connection.
Stop if:
- The joist has dropped noticeably or the deck feels unstable underfoot.
- The hanger is cracked, torn, or badly deformed.
- The ledger, beam, rim joist, or joist end shows rot, splitting, or severe insect damage.
Step 2: Set up the area and support the joist if needed
- Clear the work area so you can stand securely and reach the hanger straight on.
- If the joist has any visible looseness, place a temporary support block, clamp, or light jack support under the joist so it cannot sag while fasteners are removed.
- Gather the replacement fasteners and compare them to the hanger holes before starting.
- Plan to replace fasteners one at a time when possible so the hanger stays aligned.
If it works: The joist is supported, the area is stable, and you have the correct replacement fasteners ready.
If it doesn’t: If you cannot safely support the joist or reach the hanger without overreaching, stop and improve access before continuing.
Stop if:
- The joist shifts when lightly lifted or pressed, even with temporary support.
- You cannot create a stable working position under or beside the deck.
Step 3: Remove the damaged or incorrect fasteners
- Start with the worst fastener first, not all of them at once unless the joist is fully supported.
- Use a nail puller, pry bar, or driver to remove rusted, loose, or incorrect fasteners carefully.
- Work slowly to avoid enlarging the hanger holes or chewing up the wood around the connection.
- Brush away rust and debris so the hanger sits flat against the framing and joist.
If it works: The bad fasteners are out and the hanger is still aligned against solid wood.
If it doesn’t: If a fastener breaks off flush, remove what you can and move to an approved open hole if the hanger pattern allows it. If not, the connection may need a larger repair.
Stop if:
- Removing the fastener causes the hanger to spring loose or the joist to move out of position.
- The wood fibers around multiple holes are stripped out or split badly.
Step 4: Install the correct replacement fasteners
- Use only fasteners approved for joist hangers, typically structural connector nails or approved structural connector screws.
- Fill the same required holes the hanger was designed to use, starting with holes that pull the hanger tight to the framing.
- Drive each fastener straight so the head seats snugly without bending the hanger flange.
- Replace the remaining bad fasteners until the hanger is fully secured with the proper pattern for that connector style.
If it works: The hanger is tight to the framing and joist, and the replacement fasteners are seated cleanly in the proper holes.
If it doesn’t: If the fasteners will not tighten because the wood is too damaged to hold them, the repair has moved beyond a simple fastener replacement.
Stop if:
- The hanger holes are deformed enough that the fasteners will not seat properly.
- The wood will not hold approved fasteners securely.
Step 5: Check alignment and remove temporary support
- Look along the joist to make sure it is sitting fully in the hanger and not twisted or hanging low on one side.
- Confirm the hanger flanges are flat and the joist end is still bearing where it should.
- Remove the temporary support slowly and watch for any movement at the connection.
- Retighten or replace any fastener that backed out or failed to seat during the check.
If it works: The joist stays in place on its own and the hanger remains tight after support is removed.
If it doesn’t: If the joist settles or the hanger opens up again, the connection likely has hidden wood or framing damage that needs a broader repair.
Stop if:
- The joist drops, twists, or opens a gap when support is removed.
- You hear cracking from the wood around the connection.
Step 6: Test the repair in real use
- Walk the deck area above the repaired joist and feel for bounce, shifting, or new noise.
- Watch the hanger while someone steps nearby if you can do so safely.
- Recheck the fastener heads after the test to make sure none have loosened or started backing out.
- Inspect the same area again after the next rain or after a few days of normal use if corrosion or movement was part of the original problem.
If it works: The connection stays tight during normal foot traffic, with no visible movement at the hanger.
If it doesn’t: If movement, squeaking, or sag returns, inspect nearby hangers and framing because the root cause may be broader than one set of fasteners.
Stop if:
- The deck still feels soft, bouncy, or unstable after the fasteners are replaced.
- You find more than one failing hanger or widespread corrosion on structural hardware.
Replacement Parts
Find deck joist hanger fasteners on Amazon
Match the joist size, hanger style, hole pattern, and approved fastener type before ordering. Do not substitute common deck screws for hanger fasteners unless the connector specifically allows them.
As an Amazon Associate I earn from qualifying purchases. Repair Riot may earn a commission at no extra cost to you.
Verify the repair
- The hanger sits flat against the framing and joist with no visible gaps.
- All required fastener holes used for the repair are filled with approved connector fasteners.
- The joist stays level in the hanger after temporary support is removed.
- Normal foot traffic above the repair does not cause shifting, popping, or visible movement.
FAQ
Can I use regular deck screws in a joist hanger?
Usually no. Regular deck screws are not the same as structural connector fasteners. Use the fastener type approved for that hanger so the connection can handle load properly.
Do I need to replace every fastener in the hanger?
Not always. If only a few are loose, rusted, or wrong, you can often replace just those. If corrosion is widespread or several holes are compromised, replacing all affected fasteners is the safer path.
What if the old nails are rusted in place?
Remove them carefully with a nail puller or pry tool and avoid tearing up the wood. If they break off and the wood or hanger is damaged, the repair may need to expand beyond simple fastener replacement.
Should I replace the hanger too?
Replace the hanger if it is cracked, bent, torn, heavily corroded, or no longer sits flat. New fasteners will not fix a damaged connector body.
Why did the fasteners fail in the first place?
Common causes are corrosion, the wrong fastener type, repeated movement, or moisture damage in the surrounding wood. Replacing the fasteners works best when you also correct the underlying cause.