How to Secure the End Joist to the Outer Wall Before Installing the Adjustable FloorLock Bracing System

When fixing a sagging or bouncy floor, a strong connection between the end joist (the joist at the edge of your floor) and the outer wall is essential.If this connection is weak or loose, your joists can’t properly transfer the load to the outer wall—which means your new Adjustable FloorLock Bracing (AFB) system won’t work at its best.

Here’s how to check and strengthen this connection before you start your AFB installation.

Why This Step Matters

The end joist acts as a bridge between your floor joists and the load-bearing outer wall.Over time, nails can loosen, wood can shrink, or fasteners can corrode. This reduces the structural integrity and can make floors feel springy.By securing the end joist firmly, you ensure your bracing system has a solid foundation to work from.

What You’ll Need

• Cordless drill or power driver

• Fixing screws (or structural screws if replacing)

• Socket driver bit (to match your screws)

• Safety glasses & gloves

• Torch or work light (for crawl spaces/basements)

Step-by-Step Instructions

1. Access the Area

• Get underneath the floor via a basement or crawl space.

• Use a good work light so you can clearly see the end joist and outer wall connection.

2. Inspect the Connection

• Check where the end joist meets the outer wall frame or ledger board.

• Look for loose nails, gaps, rot, or corrosion on metal connectors.

• If you see rotting or damaged wood, replace it before proceeding.

3. Prepare the Surface

• Remove any old, loose nails or screws.

• Clear away dust, debris, or insulation blocking the joint.

4. Position the Joist

• If the end joist has sagged slightly, use a temporary prop or jack to bring it level with the other joists before fastening.

5. Secure with Screws

• Using your fixing screws (high-strength structural screws), drive two screws per side at a slight angle (toe-screwing) or directly through joist hangers if fitted.

• Screws should penetrate both the joist and the wall plate or ledger board.

6. Double-Check Alignment

• Ensure the end joist is flush against the wall plate—no gaps.

• Give the joist a firm push or tap to test for movement.

7. Repeat Along the End Joists You Intend Installing the AFB System To

• If your floor span is wide, the recommendation is one row of AFB every 6 to 7 feet. Secure each end joist connection along the outer wall frame to ensure even strength.

Pro Tips

• Always use screws instead of nails for this step—they hold better over time and resist pulling out under tension.

• Don’t overtighten screws to the point of splitting the timber.

You’re Ready for the Next Step

Once your end joists are firmly secured, you can move on to installing your Adjustable FloorLock Bracing System with confidence—knowing the load will transfer properly to the outer wall for maximum stability.