Concrete Slab & Foundation Work
Solid, properly reinforced slabs and foundations built to support whatever you put on top of them, done right the first time.
(605) 305-1070
The Foundation You Build On Matters
Everything built on a concrete slab depends on that slab being right. A garage, a shop, a storage building, an addition, a basement floor — if the foundation moves, cracks, or settles unevenly, the structure above it has a problem. That's why we take slab and foundation work seriously from the very first day on site.
We've poured residential and light commercial slabs throughout Sioux Falls and the surrounding communities. Our crews understand what South Dakota soil and weather demand: deep frost protection, proper drainage design, and reinforcement that holds up under real loads.
Whether you're building a new detached garage, adding a shop, pouring a basement floor, or laying the slab for a new home addition, we're ready to handle the job. Call us for a free site visit and estimate.
What Kind of Slab Work Do You Need?
Concrete slab and foundation work covers a wide range of projects. Here's what we handle on a regular basis for homeowners and business owners in the Sioux Falls area.
- Garage slabs: Residential and commercial garage floors poured to 4 to 6 inches thick with rebar, control joints, and a smooth or broom finish.
- Shop and pole barn floors: Heavy-duty slabs for workshops, agricultural buildings, and storage structures that see equipment and vehicle traffic.
- Home addition foundations: Slab foundations for room additions, sunrooms, and attached structures that need to tie into the existing home footprint.
- Basement floors: Interior slab pours for basements and crawl spaces, including moisture barrier installation under the concrete.
- Equipment pads: Reinforced pads for HVAC units, generators, hot tubs, and other mechanical equipment that need a stable, level surface.
- Flatwork slabs: General purpose slabs for storage areas, loading zones, and utility pads where a clean, flat concrete surface is needed.
If you're also planning walkways or other exterior flatwork alongside your slab project, take a look at our sidewalks, walkways, and flatwork page for details.
How We Approach Every Slab and Foundation Pour
A slab is only as good as what's underneath it and how it's reinforced. Here's our process, step by step.
Site Preparation
We begin with thorough excavation to the required depth. For garage slabs in Sioux Falls, we typically excavate 10 to 12 inches below the finished floor elevation to allow for gravel base, vapor barrier, and the concrete thickness itself. All organic material is removed, and the subgrade is compacted to create a stable, even platform.
Gravel Base and Moisture Control
We install a minimum 4-inch compacted gravel base. For interior slabs, we add a 6-mil poly vapor barrier over the gravel before pouring. This barrier prevents ground moisture from wicking up through the concrete, which protects the slab from below and prevents flooring adhesion issues if you plan to install flooring over the concrete later.
Reinforcement and Forms
We install rebar or wire mesh based on the load requirements and size of the slab. Heavier use applications like shops or equipment pads get rebar on a grid. Residential garage slabs typically use wire mesh. We set forms to the exact dimensions and check for level and square before anything is poured.
Pour, Finish, and Cure
We use a 4,000 PSI air-entrained mix for all slab work. The concrete is placed, vibrated to remove air pockets, screeded, and then finished to your specification. Control joints are cut at appropriate intervals to control cracking. The slab is then cured properly under plastic sheeting or blankets to retain moisture and reach full strength.
For more on our full range of concrete services, visit our concrete contractor home page. You can also learn about our concrete driveway installation service for exterior slab applications.
Get a Solid Foundation. Call Us Today.
We offer free on-site estimates for all slab and foundation projects in Sioux Falls and the surrounding area. Tell us what you're building and we'll tell you exactly what it will take to do it right.
(605) 305-1070Common Questions About Concrete Slabs and Foundations
For standard residential garages with cars and light trucks, a 4-inch slab is the minimum. We typically recommend 5 to 6 inches if you plan to park heavier vehicles, store equipment, or use the garage as a workshop. The added thickness costs relatively little during the pour but significantly extends the life of the slab and prevents cracking under heavy loads.
It depends on the project. A simple equipment pad or patio slab typically does not require a permit. Garage slabs, foundation slabs, and anything tied to a structure usually do require a building permit from the City of Sioux Falls. We can help you understand what your project requires and work with you to make sure everything is done by the book.
The actual pour for a standard two-car garage slab usually takes one day once the prep work is done. Site preparation, excavation, and base installation typically take one to two days before the pour. After the pour, the slab needs to cure for at least 7 days before light foot traffic and 28 days before vehicle use. Total project time from start to drive-in is typically two to three weeks, including scheduling and weather windows.