Overview
Garage floors can settle when the fill beneath them compacts or washes out, often near the garage door or along walls. Signs include gaps between the floor and walls, cracks and water flowing toward the house.
Leveling with mudjacking or foam can lift settled sections and restore slope. In some cases, voids under the slab can be filled without lifting.
Some garage slabs, especially in Colorado, are designed to float independently of the foundation walls. Understanding the slab design is important before lifting.
The usual process
- Inspecting the slab for settlement, cracks and voids.
- Identifying the slab design and drainage pattern.
- Recommending lifting, void filling or replacement.
- Lifting sections to restore slope.
- Recommending drainage improvements near the door.
Before you decide
- Floating slabs are designed to move. Ask how lifting accounts for that.
- Slabs sloping toward the house can direct water inside.
- Utilities under the slab should be considered before drilling.
- Ask how soon vehicles can return to the garage.
- Heavily broken slabs may need replacement.
Local notes for Colorado's Front Range
Parts of Colorado's Front Range are known for expansive clay soils and claystone bedrock that swell when wet and shrink as they dry. That movement can affect foundations, basement slabs, driveways and sidewalks, and it is one reason many local homes are built with deep foundations or floating basement slabs.
Front Range weather brings freeze-thaw cycles, spring snowmelt and summer storms. Keeping water away from the foundation with working gutters, extended downspouts, grading that slopes away from the house and careful irrigation near the foundation is a common first step before or alongside any repair.
We take inquiries from Fort Collins, Boulder, Denver, Colorado Springs, Pueblo.
What to have ready
- Say whether you are buying or selling the home, since timelines may matter.
- Describe whether water shows up in the basement, crawl space or against the foundation, and when.
- Note where gutters and downspouts discharge and whether irrigation runs near the house.
- Mention any doors or windows that stick, no longer latch or show new gaps.
- Note the age of the home and whether it has a basement, crawl space or slab.
When to keep looking
- No mention of permits for structural work where your jurisdiction requires them.
- No written proposal describing the scope, materials and number of piers or supports.
- Refusal to let you get a second opinion or an engineer's review.
- Large up-front payments demanded before any work begins.
- Vague warranty terms, or no answer about whether the warranty transfers to a new owner.
Questions to ask a provider
- How will you avoid utilities under the slab?
- Why has my garage floor settled?
- How soon can I park in the garage?
- Do you recommend lifting or void filling?
- Is my slab a floating slab, and how does that affect repair?
Common questions
- Are garage floor cracks a problem?
- Many are cosmetic. Cracks with settlement or displacement may need attention.
- How soon can I park after leveling?
- It depends on the method. Ask your contractor.
- Why is there a gap between my garage floor and wall?
- Settlement of the slab is a common cause, though floating slabs may also move by design.
Related topics
- Mudjacking: How mudjacking raises sunken concrete slabs, where it is used, and how it compares with foam leveling.
- Polyurethane Foam Leveling: How polyurethane foam (polyjacking) lifts concrete slabs, its trade-offs, and questions to ask.
- Patio and Pool Deck Leveling: Leveling patios, pool decks and porches, why they settle, and questions to ask.
Tell us a little about what you need, and we'll get back to you about garage floor leveling.