How thick should a concrete slab be?

For residential applications, we typically pour 4-inch slabs for sheds and storage buildings. Garage slabs are usually 4 to 6 inches depending on vehicle weight. Foundation slabs for homes require engineered specifications based on soil conditions and building codes.

Do I need a permit for a concrete slab?

Most concrete slabs require permits, especially if they are for structures like garages or additions. We help you understand local requirements and can assist with the permit process. Small slabs for sheds may not need permits, but it is always best to check with your local building department.

How long does it take to pour a slab?

Site preparation and formwork typically take 1 to 2 days. The concrete pour itself happens in one day. After pouring, you need to wait at least 7 days before placing heavy loads on the slab. Full curing takes about 28 days.

Concrete Slab & Foundation Work

We pour solid, level concrete slabs and foundations that provide the structural base your building project needs.

Professional concrete slab and foundation installation by contractors in Andover, MA

Call (978) 684-0096 Learn More About Our Process

Why Foundation Work Matters More Than You Think

Your foundation is literally what everything else sits on. Whether you're building a new garage, adding a shed, or constructing a home addition, the concrete slab or foundation determines how well that structure performs for decades to come. Quality foundation work prevents settling, cracking, and moisture problems that can cost thousands to fix later.

Here in Andover, MA, we deal with freeze-thaw cycles, groundwater, and soil conditions that put extra stress on foundations. The contractors who cut corners on foundation work create problems that show up years later when walls crack or floors become uneven. We do it right the first time because we know what's at stake.

What Proper Foundation Work Provides

Creates a level, stable base that prevents settling and structural movement
Distributes weight evenly to prevent cracking and foundation failure
Keeps moisture out of your building through proper drainage and vapor barriers
Meets local building codes and passes inspection without issues
Lasts the entire lifetime of your structure with minimal maintenance

Types of Slab and Foundation Work We Handle

Not all slabs are the same. Different projects need different approaches, and we have the experience to handle them all. From simple shed pads to complex foundation systems, we match the right solution to your specific needs.

Monolithic Slabs for Garages and Sheds

A monolithic slab combines the foundation footing and floor slab into one piece of concrete. We excavate, pour the perimeter footing area thicker, and then pour the center slab all at once. This works great for garages, sheds, and other outbuildings where you need a simple, cost-effective foundation. The result is a solid base that's ready to support your structure.

Stem Wall Foundations

For home additions or larger buildings, a stem wall foundation might be the better choice. We pour concrete footings below the frost line first. Then we build concrete block or poured concrete walls on top of those footings. Finally, we pour the interior slab. This creates a crawl space and gives better insulation and drainage options than a slab-on-grade foundation.

Interior Floor Slabs

Sometimes you need to replace or repair an existing interior floor slab. Maybe you're finishing a basement, or an old slab has cracked and settled. We remove the damaged concrete, prepare the base properly, install new vapor barriers and insulation if needed, and pour a fresh level slab. This is similar work to our concrete repair and replacement services but focused specifically on interior floors.

Our Step-by-Step Foundation Installation Process

Foundation work requires careful planning and precise execution. We follow proven methods that ensure your slab or foundation performs exactly as it should. Here's how we approach every project from start to finish.

Site Evaluation and Soil Testing

We start by examining your site and testing the soil conditions. Different soil types require different preparation methods. Clay soil expands and contracts with moisture, so we might need to excavate deeper or add more base material. Sandy soil drains well but needs proper compaction. Rocky soil might require special equipment. We figure all this out before we start digging so there are no surprises.

Excavation and Base Preparation

Next comes excavation to the proper depth and preparation of the base. For foundations, we dig below the frost line to prevent heaving. We install granular fill material, compact it in layers, and make sure everything is level and properly graded for drainage. This is similar to the base work we do for concrete driveways, but even more critical because buildings are heavier and less forgiving.

Forms, Reinforcement, and Pour

We build forms that establish the exact dimensions and elevation of your slab. We install steel reinforcement bars or wire mesh according to engineering specifications. We place vapor barriers to keep moisture from wicking up through the concrete. Then we pour the concrete, making sure it flows into every corner and around all reinforcement. We work quickly because concrete doesn't wait, using vibrators to eliminate air pockets and screeding to achieve a perfectly level surface.

Foundation and Slab Questions Answered

Planning a building project that needs a solid foundation?

Call (978) 684-0096 to Discuss Your Project