Crawl Space Jacks & Floor Stabilization in Utah
Crawl space floor stabilization corrects a floor that sags, bounces, or slopes toward the middle of the house by setting rated steel jack posts on new concrete footings, and where needed a supplemental beam, under the joists that lost their support. Grandview installs it under a Utah B100 general contractor license.
When jacks are the right fix, and when they aren’t
The question is where the floor is dropping. A dip in the center of the house, a gap at the base of an interior wall, hallway doors that stick while the exterior walls look fine: that’s mid-span support failing, not the perimeter. The girder sits on wood posts that rotted, on pads that settled, or on too few posts to begin with. Jacks and footings are built for exactly that.
If the low side runs along an exterior wall and the foundation shows cracks, the footing is settling and you need push piers or helical piers under the perimeter, not jacks in the middle. If the floor is level but the crawl space is wet or musty, crawl space encapsulation is the scope. If the framing itself is the problem (joists notched for plumbing, an overspanned girder), a load-bearing framing repair goes in alongside the new supports.
What the stabilization work involves
The details decide whether it holds:
- Footings, not pads. Each jack bears on a poured concrete footing, sized by the engineer to the soil’s bearing capacity and dug below the loose surface soil. A pier block set on dirt is the shortcut that produced the sag you’re paying to fix.
- Rated steel jack posts. Heavy-wall steel columns with a screw-jack head, listed for permanent use, anchored to the footing and fastened to the beam above. Not the telescoping hardware-store post meant for temporary shoring.
- Supplemental beams. Where joists are overspanned, a new steel or built-up LVL girder goes in perpendicular to them, with jacks at engineered spacing, typically every six to eight feet.
- Joist repair. Cracked, cut, or moisture-softened joists get sistered with full-length lumber glued and bolted alongside them before any lift goes on.
- Incremental lift. A floor that dropped over years comes back up in small turns over days, so plaster, tile, and drywall above move with it instead of cracking.
How a crawl space stabilization project runs
- Inspection. We check every post and pad, probe the girder and joists with a moisture meter and an awl, and shoot elevations upstairs so the sag is measured, not described.
- Engineering. A licensed structural engineer, coordinated by us, sizes the footings, sets post spacing, and specifies any beam or sistering. That stamped design goes to your city with the permit application.
- Moisture first. If the original posts rotted, the water is still there. Drainage, a sump, or a vapor barrier gets sequenced before new steel. We see dependencies before they become delays.
- Footings. Holes dug by hand, concrete carried in through the hatch, footings cured before they carry load.
- Posts, beams, and lift. Jacks set plumb and snug, then raised in stages over several visits, checking elevations upstairs each time.
- Documentation. Before-and-after elevations, photos of every footing and post, inspection records, and the engineer’s letter where required.
Utah soil is often why the first supports failed. Collapsible bench soils, mapped by the Utah Geological Survey across much of the Wasatch Front, hold a pad fine until a plumbing leak wets them for the first time, then drop abruptly. Expansive clay on the valley floor does the opposite, heaving pads each wet spring and dropping them each dry summer until the posts work loose. The footing design accounts for which one you have. And because a bare dirt crawl floor is the main radon entry path in Utah’s high-radon geology, a vapor barrier after the steel often makes sense while the space is open.
What crawl space floor stabilization costs in Utah
As ballpark planning numbers, a rated jack post with a new poured footing commonly lands between $400 and $900 installed in Utah, and most homes need four to ten. A supplemental steel or LVL beam adds roughly $1,500 to $4,000 depending on length and access. The engineer’s design sets the real count and the real price.
What moves the number: crawl space height (an 18-inch space costs more per post than a 36-inch one), how far the floor dropped, whether a beam is needed, joist condition, and any moisture correction that comes first. A consultation gives a budget range, engineering gives an estimate, and the signed proposal is the fixed scope.
Questions we actually get
Can you jack a sagging floor back to level?
Usually most of the way, sometimes all of it. Framing that sagged over decades has taken a set, and forcing it flat in one visit cracks finishes and can split a girder. We lift in small increments over days and stop where the engineer says. Full recovery is the goal, not the promise.
Do the jack posts really need their own concrete footings?
Yes. A steel post concentrates the floor’s load onto a few square inches, and Utah’s collapsible and expansive soils will move a block set on dirt. Each post gets a poured footing sized to the soil. Skipping the footing is the most common reason an earlier jack job failed.
Should the crawl space be dried out before or after the jacks go in?
Before, if water rotted the original posts or softened the joists. Drainage, a sump, or a sealed vapor barrier goes first so the new footings and steel sit in a dry space. If the crawl space is already dry, the jacks go in first and encapsulation or insulation can follow in the same project.
Is a permit and an engineer required to install crawl space jacks?
In most Utah cities, yes, because you’re adding permanent structural supports and footings. Building departments generally want a licensed engineer’s stamped design with the application. We coordinate the engineering and pull the permit; verify specifics with your city’s building department. Our license is verifiable at dopl.utah.gov.
Crawl space floor stabilization is one scope within our foundation repair service and the wider site, structure and envelope family. Once the floor is supported, crawl space insulation is the natural next step; for new construction, see crawl space foundations.
Tell us what your floor is doing
Send a photo of the low spot and we’ll give you a straight read: jacks, piers, or moisture first. We reply within a couple of hours during business hours, a day at most.