The wooden floor joists in your crawl space carry the weight of your home. When moisture, age, or minor pest activity weakens these joists, your floors lose their structural support and begin to sag or bounce.
However, full joist replacement is not always necessary. If the damaged wood is still salvageable, Elite Moisture Solutions utilizes a process called joist “sistering.” We install high-strength timber directly alongside the existing joist. By bolting the new lumber to the old wood, we double the strength of the framing and bridge the compromised area. This provides a permanent structural repair that securely supports your floors.
Signs Your Home Needs Joist Reinforcement
When the floor joists under your home weaken, the symptoms appear in your living spaces. If you notice the following physical changes, your floor framing likely requires reinforcement:
Sagging or Dipping Floors: A distinct dip in the floor surface, indicating the joists below are bending under the weight of the room.
Bouncy Floors: Floors that move up and down or feel soft when you walk across them. This means the joists have lost their rigidity.
Visible Wood Damage: Wood in your crawl space that shows signs of cracking, splitting, or minor surface rot, but remains largely intact.
Floor Gaps: Visible space appearing between your baseboards and the floor, caused by the floor system dropping slightly.
Our Joist Sistering Process
We follow a strict structural process to ensure the new timber fully supports the weight of the floor above it.
Primary Goal: Restore the load-bearing capacity of weakened floor joists without needing a full demolition.
Material: We use high-strength, pressure-treated lumber that resists moisture and wood-destroying insects.
The Installation: First, we measure the compromised area. We then cut a new piece of pressure-treated lumber to span past the damaged section. Finally, we place the new timber directly against the existing joist and secure them together using heavy-duty structural bolts.
Load Transfer: Once the new wood is bolted in place, it takes over the structural load, bypassing the weakened section of the original joist.
Learn more about a joist sistering project we did in Chapel Hill.
Cost & Financing for Joist Sistering
The total cost of joist sistering depends on the number of joists that require reinforcement and the length of the timber needed to bridge the damaged areas.
Estimated Cost: Most joist sistering projects in the Raleigh area range from $2,000 to $4,500. Sistering is often more cost-effective than full wood replacement because it requires less demolition.
Flexible Financing: We make structural safety affordable. We offer 6-month, 12-month, and 18-month “same-as-cash” options, as well as traditional financing terms through our trusted partnerships with Regions Home Improvement Financing and Greensky.
Frequently Asked Questions About Joist Sistering
What is the difference between sistering and full wood replacement?
Sistering leaves the original joist in place and attaches new wood next to it for support. Full replacement requires removing the damaged wood entirely before installing a new piece. We only use sistering when the original wood still has enough structural integrity to hold the bolts.
Will sistering fix a floor that is currently sagging?
Yes. During the sistering process, we use temporary hydraulic jacks to lift the sagging floor back to a level position. We then bolt the new timber in place to keep the floor permanently supported at that correct height.
Do you treat the old wood before sistering the new wood to it?
Yes. If there is minor surface mold or wood fungus on the salvageable joist, we physically remove it and apply a protective treatment before attaching the new lumber.
Is the new wood protected against termites and moisture?
Yes. We exclusively use pressure-treated lumber for our sistering repairs. This material is manufactured to resist high humidity, rot, and pest activity in crawl space environments.
5-Star Rated Service
Don’t just take our word for it. With 110+ five-star reviews on Google, we are Central North Carolina’s most trusted foundation repair team. See why your neighbors choose Elite for their toughest structural repairs.
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Ironclad Protection
We build solutions that last, and we back them up. Our structural repairs come with industry-leading, transferable warranties, ensuring your home’s value is protected for years to come.
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1Loans provided by EnerBank USA, Member FDIC, (1245 Brickyard Rd., Suite 600, Salt Lake City, UT 84106) on approved credit, for a limited time. Repayment terms vary from 24 to 132 months. Interest waived if repaid in 365 days. 17.99% fixed APR, effective as of November 1, 2020, subject to change. Interest starts accruing when the loan closes.
2Loans provided by EnerBank USA, Member FDIC, (1245 Brickyard Rd., Suite 600, Salt Lake City, UT 84106) on approved credit, for a limited time. Repayment term is 60 months. 4.99% fixed APR. Minimum loan amounts apply. The first monthly payment will be due 30 days after the loan closes.