Concrete Slabs Explained: Garages, Sheds, Foundations, and More

Concrete slabs are the backbone of countless structures—from garages and sheds to foundations and equipment pads. While they may look simple, not all concrete slabs are the same. Thickness, reinforcement, and preparation vary based on how the slab will be used—especially in climates like Denver.

At Wally’s Concrete, we design slabs for long-term performance, not one-size-fits-all solutions. Here’s a clear breakdown of the most common types of concrete slabs and what makes each one different.

What Is a Concrete Slab?

A concrete slab is a flat, horizontal surface poured over a prepared base. Its job is to:

• Distribute weight evenly

• Provide a stable surface

• Resist cracking and settling

• Handle moisture and temperature changes

The right slab design depends on load, use, and soil conditions.

Garage Slabs: Built for Vehicles & Storage

Garage slabs must support:

• Vehicle weight

• Daily traffic

• Tool and equipment loads

Typical features include:

• Increased thickness

• Reinforcement with rebar or mesh

• Proper slope for drainage

A well-built garage slab prevents cracking, oil staining issues, and uneven settling over time.

Shed Slabs: Simple but Still Important

Shed slabs may seem straightforward, but they still require proper prep.

Key considerations:

• Stable, compacted base

• Adequate thickness for stored items

• Proper elevation to avoid water intrusion

Skipping prep on shed slabs often leads to cracking and shifting within a few seasons.

Foundation Slabs: Precision Matters

Foundation slabs are structural—mistakes are costly.

They require:

• Engineered thickness and reinforcement

• Careful grading and drainage

• Precise forming and curing

• Compliance with local building codes

This is where professional experience is essential.

Equipment Pads & Utility Slabs

Concrete slabs are commonly used for:

• HVAC units

• Generators

• Trash enclosures

• Commercial equipment

These pads must:

• Support concentrated loads

• Remain level

• Handle vibration

Even small pads need proper reinforcement and base preparation to last.

Thickness & Reinforcement: Why It Varies

Slab thickness isn’t arbitrary.

It depends on:

• Load requirements

• Soil conditions

• Climate exposure

• Intended use

Reinforcement helps control cracking and adds strength—but only when designed correctly.

Base Preparation Makes the Difference

Most slab failures start below the concrete.

Proper preparation includes:

• Excavation to correct depth

• Compacted gravel or road base

• Drainage planning

This is especially important in Colorado’s freeze-thaw environment.

Residential vs. Commercial Slabs

Residential slabs prioritize:

• Function and longevity

• Clean finishes

• Cost efficiency

Commercial slabs require:

• Higher load capacity

• Thicker sections

• Code and inspection compliance

Knowing the difference prevents underbuilding.

How Long Do Concrete Slabs Last?

When installed correctly, concrete slabs can last:

• 30–40+ years for residential use

• Decades for commercial and structural applications

Longevity depends on design, prep, and installation quality.

Build the Right Slab from the Start

Concrete slabs may not be flashy—but they’re critical. Getting the design right from the beginning saves money, prevents repairs, and ensures long-term performance.

📞 Contact Wally’s Concrete today for expert slab design, installation, and a free consultation tailored to your project.