Crawl Space Support Systems
Sagging floors above a crawl space almost always trace back to the same root cause: the joists or beams underneath have lost the support they were originally built with. Foundation Solutions installs engineered steel crawl space supports — adjustable jacks and piers set on solid footings — to lift sagging framing back toward level and hold it there permanently. Every installation starts with a free inspection so we can recommend the right number and placement of supports for your home. For broader crawl space issues like moisture or mold, see our crawl space repair services.
Signs Your Crawl Space Needs Additional Support
A crawl space is largely out of sight, so the first clues that something is wrong usually show up in the rooms above it. Here’s what homeowners typically notice first. If it is your whole home settling rather than just the crawl space, see our house leveling or foundation underpinning pages.
Sagging or Bouncy Floors
If the floor dips noticeably in the middle of a room or feels springy when you walk across it, the joists below have likely lost some of their original support.
Visible Gaps at the Baseboards
As floor framing sags, the gap between the floor and the baseboard or wall trim tends to widen — a small but telling sign of movement below.
Cracking or Splitting Joists
Wood joists that are undersized, water-damaged, or carrying more weight than they were built for can crack or split under long-term stress.
Musty Odors or Uneven Flooring
A persistent musty smell combined with floors that feel uneven from room to room often means the crawl space below has both a moisture problem and a support problem.
What Causes Crawl Space Floors to Sag?
Floor framing is engineered to carry a specific load over a specific span. When either of those numbers changes — or the original construction fell short — the floor above starts to give.
Overspanned Floor Joists
Joists that span farther than they were designed for flex more than they should, and that flex only gets worse as time and added weight take their toll.
Moisture & Wood Rot
Consistently damp conditions soften wood fibers over months and years, and rotted framing can no longer carry the load it once did.
Undersized Original Construction
Some homes were framed with joists or spacing that were undersized even when new, which is why sagging can show up well before a home reaches old age.
Added Weight Over Time
Renovations, extra flooring layers, heavy furniture, or stored items in the space above all add load that the original framing wasn’t sized to carry.
Support Solutions & Related Services
Adjustable Steel Jacks
Permanent, adjustable steel jacks are set on concrete footings beneath sagging joists or beams and can be fine-tuned over time, without the upkeep a wood post requires.
Helical Piers
In softer or unstable soil, helical piers are twisted down to load-bearing depth to give each support jack a stable footing to bear on. Learn more →
Joist Sistering & Reinforcement
Where a joist has cracked or split, we reinforce it by sistering a new joist alongside the damaged one, restoring its original strength.
Crawl Space Repair
Beyond structural support, a healthy crawl space also needs to stay dry and free of mold. Our full crawl space repair service covers moisture control, joist repair, and vapor barriers alongside structural jacks. Learn more →
Wall Repair System
If it is not just the floor but the foundation wall itself that is bowing or cracking, we reinforce it with carbon fiber straps or steel beams matched to the severity of the movement. Learn more →
Wall Anchors
For walls that need to be gradually straightened rather than just held in place, wall anchors extend out into stable soil and can pull a bowing wall back over time. See our wall repair systems →
FAQs
About Crawl Space Supports
How Many Crawl Space Supports Will My Home Need?
It depends on the size of your crawl space, how far your joists span, and how much the floor has already sagged. Our technicians measure the affected area during your free inspection and recommend the exact number and spacing needed to bring the floor back to level.
Will Adding Supports Fix My Sagging Floor Completely?
In most cases, yes. Supports are installed with jacks that gradually raise the floor back toward its original position before locking in place. Severely sagging areas may need to come up in stages over several visits to avoid stressing the framing or finishes above.
Do Crawl Space Supports Require Maintenance?
Our steel jacks are built to hold their position without upkeep, but it's worth having your crawl space inspected periodically for moisture, since damp conditions are what caused many support issues in the first place.
Crawl Space Supports Are Easier With the Right Team
A sagging floor is easier to fix the sooner it’s addressed. Our local technicians can inspect your crawl space, explain exactly what’s happening beneath your floors, and recommend a support plan built to last, backed by our warranty. For heavier settlement, our push pier specialists can help, and for a sunken driveway or patio, see our concrete lifting page. Check our full signs and symptoms guide for more.
Testimonials
I don't even know where to start with this review. From the first contact to the end of the job, Ryan and his crew were amazing - professional, knowledgeable, courteous, tidy and clean and very respectful of the impact the job had on me as the homeowner. The job was major, but I felt confident with the information that Ryan and his crew shared with me each step of the project. Since they are specialists, they are very busy so it took a while from start to finish but worth the wait! I could not be more pleased. They get an A+++ from me.
We had a consultation with a very knowledgeable engineer (Collin) who's extremely patient to answer questions and concerns we had. After a thorough walkthrough and measurements, it turned out the area which we thought might be problematic with leveling is only centralized and minuscule, not foundation-related. I'd like to thank Foundation Solutions for this engineer's detailed explanations, professional knowledge and recommendations. At the end, we acquired peace of mind and would highly recommend this company to anyone that may be seeking help with foundation related issues. If we are doing any addition/expansion of our house, we would definitely get in touch again for securing our foundation.
Kyle and the team are awesome! A corner of our foundation has a horizontal crack and when we go out for a quote, many companies explained how serious it is and give us a high estimation. Kyle came onsite and did a detailed inspection, explain why it crack, and how to properly fix it. Then few days later, gave us a reasonable estimate, and we decided to go with the service, they handled the permit, came to fix it in a day and did all the final inspection and passed, we have a smooth experience on the fix. My family are super happy with their service and already recommend to friends in case they need some work in the foundation.