Garage floors, pads and foundations for outbuildings
Concrete Slabs in Grand Junction, CO
A flat, solid slab under your shed, shop, garage or camper, built for the weight it will carry.
- Free on-site estimates with a soil, drainage and irrigation check
- Itemized written quote listing thickness, base, reinforcement and finish
- We tell you up front when City of Grand Junction right-of-way rules apply
A Solid Pad Under Whatever You Are Building
Concrete slabs in Grand Junction hold up some of the heaviest things on a property: a detached garage or shop, a storage shed full of tools, a travel trailer or fifth-wheel parked for the winter, a hot tub, or a generator and HVAC equipment. Lots of Grand Valley homeowners have the room and the reason for these, from orchard and acreage properties out toward Palisade and Loma to in-town lots with alley access. A slab is simple in concept, but it has to be flat, level where it should be, sloped where it needs to drain, and thick enough for its load. A shed pad poured like a patio, or an RV pad poured like a sidewalk, will crack under the weight.
Common slab projects
- Garage floors: new detached garages, or replacing a cracked and sunken floor in an existing one.
- Shed and shop pads: slabs for prefab sheds, workshops and pole buildings.
- RV and trailer pads: a thick, reinforced pad beside the driveway or behind a gate.
- Hot tub and equipment pads: level slabs for spas, generators, condensers and propane tanks.
- Basketball and sport courts: a large, flat slab with a smooth finish and careful joints.
Thickness, steel and what is underneath
HomeGuide's slab guide lists 4-inch concrete at $6 to $8 a square foot and 6-inch at $8 to $10. Sheds and light-duty pads are usually fine at 4 inches. Campers, trailers and heavy machinery call for 5 to 6 inches or more with rebar, plus thicker edges anywhere a wall or post bears down. The base matters just as much. The Colorado Geological Survey lists cracked garage floors, driveways and sidewalks among the signs of swelling soil on the Western Slope, and it points out that outside slabs can be damaged even when the house sits on piers. So soft and organic soil comes out, gravel is compacted in lifts, and grade and gutters are set to keep water from running under the new pad. HomeGuide puts a gravel base at $1 to $3 a square foot.
How we pour a slab
We start with the plan: the building or equipment that will sit on it, its footprint, any anchor bolts or post locations, and where the door and approach will be. If the slab is for a structure, we check with the City of Grand Junction or Mesa County on permit requirements and follow the approved plans for thickened edges, footings and anchors. We then excavate, compact the base, and set forms square and to grade. A vapor barrier goes under interior slabs like garage and shop floors when the use calls for it. Rebar is set on chairs, the concrete is placed and screeded flat, and the surface is finished: smooth troweled for a garage or shop floor, broom finished outdoors. Control joints are cut the same day, and we keep the slab damp while it cures.
After the pour
You can usually walk on a slab in a day or two. Hold off on building walls or setting a shed for several days, and wait about a month, full cure, before parking an RV or setting a filled hot tub on it. Seal outdoor slabs, keep downspouts and sprinklers draining away from them, and fill any gap along the edge so water does not run underneath.
Slabs We Pour
Every slab is sized and reinforced for its load. These are the most common.
Garage floors
New or replacement floors with a smooth trowel finish and slope to the door.
Shed and shop pads
Square, level pads for prefab sheds, workshops and pole buildings, with anchors where needed.
RV and trailer pads
Thicker, rebar-reinforced pads for campers, boats and trailers.
Hot tub pads
Level, reinforced pads sized to the tub and its full weight.
Equipment pads
Small pads for HVAC condensers, generators and tanks.
Sport courts
Large flat slabs for basketball and play, with careful joint layout.
Typical Concrete Slab Costs
| Item | Published range |
|---|---|
| 4 in slab, per sq ft | $6 to $8 |
| 6 in slab, per sq ft | $8 to $10 |
| 8 in slab, per sq ft | $10 to $12 |
| Shed slab, 100 to 400 sq ft | $600 to $4,800 |
| Two-car garage floor, 400 to 576 sq ft | $2,400 to $6,900 |
| Gravel base, per sq ft | $1 to $3 |
| Old slab removal, per sq ft | $3 to $8 |
National ranges from HomeGuide's concrete slab cost guide. Thickness, reinforcement, access for the concrete truck and any plan or permit requirements change the Grand Junction price. Your written estimate is the price.
How It Works
1. Plan the slab
We confirm size, load, anchors and drainage, and check permit needs for structures.
2. Excavate and base
Soft soil removed, gravel base compacted, forms set square and to grade.
3. Reinforce and pour
Rebar on chairs, vapor barrier where needed, concrete placed and finished.
4. Joint and cure
Control joints cut, the slab cured, and you get dates for loading it.
Concrete Slabs Questions
How thick should a shed or garage slab be?
Four inches is typical for sheds and light garage use. Heavier loads like RVs, trailers and shop equipment need 5 to 6 inches or more with rebar, and structures may need thickened edges or footings per their plans.
How much does a concrete slab cost?
HomeGuide's national range is $6 to $8 per square foot for a 4-inch slab and $8 to $10 for 6 inches. A shed slab of 100 to 400 square feet runs about $600 to $4,800, and a two-car garage floor about $2,400 to $6,900.
Do I need a permit for a shed or garage slab?
It depends on the structure, its size and whether you are in the City of Grand Junction or unincorporated Mesa County. We check with the right office before we schedule.
Do you put a vapor barrier under the slab?
For garage, shop and other interior floors where moisture coming up through the slab matters, yes. Outdoor pads usually do not need one.
How soon can I park my RV on a new pad?
Wait about a month for the concrete to reach full design strength before parking heavy RVs or trailers on it.
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Get a Concrete Slabs Estimate
Let us know what the slab will hold and roughly how big it is, and you will get a written price.