How to Create a Temporary Support Beam to Level a Floor Before Installing the Adjustable FloorLock Bracing System

Uneven or sagging floors don’t just affect the look of your home and can lead to structural strain over time. Before installing the Adjustable FloorLock Bracing (AFB) System, if the floor has severe sagging, it’s important to ensure your floor is as

level as possible. One effective way to do this is by creating a temporary support beam under the joists to gently lift and hold the floor while you work.

The good news is? This process can be done safely and effectively as a DIY project with the right preparation and patience. Below, we’ll walk you through the process step-by-step.

Why Use a Temporary Support Beam?

A temporary support beam allows you to:

• Gradually lift a sagging section of the floor.

• Reduce stress on existing joists.

• Hold the floor in the correct position while you brace it with the AFB system.

• Avoid sudden shifts or damage that can happen if you try to fix everything at once.

Tools & Materials You’ll Need:

• Safety glasses & work gloves

• Tape measure

• Carpenter’s level or laser level

• Hydraulic bottle jack(s) or screw jack(s)

• Solid blocking (timber offcuts) for jack bases

• 8x2 or 6x2 solid timber beam (length depends on joist span)

• Adjustable steel posts (lally columns) or additional timber posts

• Drill & driver

• Lag screws or bolts (optional for extra stability)

Step 1: Identify the Sagging Section

1. Walk the floor slowly, feeling for low or bouncy spots.

2. Use a carpenter’s level or laser level along the joists to see where the dip begins and ends.

3. Mark the area on the subfloor above or directly on the joists below so you know exactly where to position the beam.

Step 2: Clear the Work Area

If you’re working in a crawl space or basement:

• Remove any obstacles directly beneath the sagging joists.

• Make sure there’s enough clearance to position your beam and jacks.

Step 3: Cut and Position the Temporary Beam

1. Measure the Span: Your beam should run perpendicular to the joists, covering the full width of the sagging section.

2. Select the Beam Size: A solid, straight piece of 8x2 timber is ideal for heavy lifting, though a 6x2 can work for smaller spans.

3. Position the Beam: Place it under the joists so it makes full contact with them across the span.

Step 4: Prepare the Jacking Points

1. Place a thick block of timber (at least 12"x12") on the ground beneath where each jack will go—this spreads the load and prevents sinking.

2. Position the hydraulic bottle jack or screw jack under the beam at each end. If the span is long, use an additional jack in the middle for even lifting.

Step 5: Slowly Raise the Floor

1. Lift Gradually: Turn the jack handle just enough to apply slight upward pressure—about 1/8" to 1/4" at a time.

2. Work in Stages: Lift one jack slightly, then the other, alternating so the beam rises evenly.

3. Avoid Overlifting: Trying to force the floor level in one go can crack plaster, damage flooring, or strain joists. Spread the lifting process over several hours—or even days—for older homes.

Step 6: Add Temporary Posts for Support

1. Once the floor is at the desired height, place adjustable steel posts (lally columns) or cut-to-size timber posts between the beam and the ground.

2. Position them evenly along the beam (about every 4–6 feet).

3. Tighten the posts so they fit snugly, keeping the floor at its new level.

Step 7: Check Level and Prepare for AFB Installation

• Use your level to confirm the joists are straight and even.

• Make any final micro-adjustments with the jacks.

• Ensure the floor feels stable before you begin installing the Adjustable FloorLock Bracing System.

Safety Tips:

• Always lift gradually to prevent sudden structural shifts.

• Never work under a jacked-up floor without temporary posts in place.

• For large or complex sags, consult a structural engineer before lifting.

Final Thoughts

Installing the AFB system on a level floor ensures it works at maximum efficiency—preventing future sagging and adding decades to your floor’s stability. By creating a temporary support beam first, you give yourself a safe, solid starting point for the bracing process.

Take it slow, check your work often, and you’ll be rewarded with a floor that feels firm, level, and built to last.