Home › Services
Pads for garages, sheds and campers, sized by weight
Whatever sits on it, be it a garden shed, a detached garage, a workshop or a travel trailer, a pad is judged by one thing: whether it stays flat under what actually sits on it. A pad that is perfect for a lawn mower and a few bicycles can crack under a pontoon boat on a tandem trailer, and a garage floor that feels fine the first year can start sweating on humid summer mornings if moisture was never considered. This page walks through how to match a slab to its load and its building, and what an Augusta-area homeowner should see spelled out in a quote.
Begin with the heaviest thing that will ever sit there
Before any conversation about size or finish, write down what the slab will carry today and what it might carry later. A garden shed full of tools, a two-car garage, a workshop with a heavy table saw or lift, a travel trailer, a fifth-wheel camper and a bass boat on its trailer all load a slab differently. The concentrated weight of a jack stand, a trailer tongue or a camper leveling pad matters as much as the total weight.
Plenty of Columbia County and Aiken County homeowners keep a boat for Clarks Hill Lake or the river, and campers and utility trailers are common on larger lots across the region. If a heavier vehicle is even a possibility, say so. It is far easier to pour a thicker, better-reinforced slab now than to replace a cracked one later.
Thickness, thickened edges and reinforcement
A typical residential slab for light use is around four inches thick. Pads for heavier vehicles, RVs and larger equipment are commonly thicker, and many buildings sit on a slab with thickened edges, where the perimeter is deepened into a footing that carries the walls. For a garage or workshop, the building plans or the kit manufacturer usually specify what the structure needs, and those requirements should drive the slab design.
Reinforcement choices include welded wire, rebar in a grid and synthetic fibers, sometimes in combination. Each helps hold cracks tight and keep panels level. Placement is what makes it work: steel needs to sit within the slab, supported on chairs or blocks, rather than lying on the stone. Ask what they recommend for your load and what will keep the steel at the right height as the concrete goes in.
Compacted ground under a heavy pad
The heavier the load, the more the subgrade matters. Sandy soils common across the southern and eastern parts of the region compact well when they are worked in thin layers with the right moisture, but loose sand under a pad will settle under a camper’s weight. Red clay in the northern parts of the area is firm when dry and much weaker when soaked, so keeping water away from a slab on clay is essential.
Many shed and garage slabs are built on ground that has to be leveled first, which means cutting on one side and filling on the other. Fill needs to be placed and compacted in lifts rather than dumped and smoothed, or the low side of the slab will slowly sink. Ask how much fill the contractor expects to place and how it will be compacted.
Moisture under enclosed slabs
Slabs that will sit under a roof and walls, such as a garage, workshop or insulated shed, face a problem open pads do not. Moisture from the ground can move up through the concrete and condense, dampening stored items, lifting floor coatings and encouraging mildew in a humid climate. A plastic vapor retarder laid beneath the slab is a common way to reduce this. Whether one is appropriate, and where it goes relative to the stone, depends on the building’s use, so ask about it for any enclosed space.
Garage floors can also sweat on muggy days when warm, wet air meets a cooler slab. Good ventilation helps, and a slight slope toward the door lets water from wet cars drain out rather than pooling in the middle.
Access, layout and anchoring
Concrete trucks are heavy, and many backyard slab locations are hard to reach. Fences, septic systems, soft lawns and tight side yards change how concrete gets from the street to the forms. A pump or a line of wheelbarrows may be needed, and a truck driven over a septic field or an irrigation system can damage it. Point out underground features, including septic tanks and drain lines, before the work is scheduled, and call the utility-locating service so buried lines are marked.
For buildings, the slab dimensions should match the structure exactly, and anchor bolts or straps for the walls may need to be set in the fresh concrete. Share the building plans or kit drawings with the contractor well in advance so nothing has to be drilled in afterward.
Permits, setbacks and HOA rules
Garages, workshops and some sheds may need approval from the city or county, and there are often rules about how close a structure can be to property lines. Many subdivisions around Augusta also have HOA covenants that address outbuildings, RV parking and pad locations. The requirements vary from one jurisdiction and neighborhood to the next, so confirm the rules with the permitting office and any HOA before you settle on a size or spot.
What a slab quote should spell out
- Slab dimensions and thickness, including any thickened edges or heavier sections.
- Base material, depth and compaction method, plus any fill to be placed.
- Reinforcement type, spacing and how it will be supported.
- Whether a vapor retarder is included for an enclosed building.
- Joint layout, finish, and slope toward the door or away from structures.
- Anchor bolts or embedded hardware, if the slab carries a building.
- How the truck or pump will reach the site and what protection the lawn gets.
Pads for garages, sheds and campers, sized by weight — common questions
How thick should a shed slab be?
A slab for a typical storage shed holding yard tools and a mower is often around four inches thick over a compacted stone base. If the shed will hold something heavier, such as a riding mower, a golf cart or a workshop setup, a thicker slab or thickened edges may be appropriate. The shed manufacturer or builder may also have requirements, so share their drawings with the contractor.
Does an RV or boat pad need to be different from a driveway?
Usually, yes. A camper, or a boat on its trailer, puts its whole weight through a handful of tires and a tongue jack, and it often sits in one spot for months. That calls for a thicker slab, solid reinforcement and a well-compacted base. Length matters too, since a pad that is too short leaves wheels on the grass. Measure the rig and discuss turning room with the contractor.
Should a garage slab have a vapor barrier?
For garages and workshops that will be enclosed, a vapor retarder under the slab is a common recommendation, especially in a humid area where ground moisture can make floors damp and coatings peel. It is less important for open carports or uncovered pads. The contractor can explain where it goes in the layers under the slab and whether your building’s use calls for one.
Can I build a shed directly on a new slab right away?
Light framing can often begin after a few days, but check with the contractor first. Heavy loads, such as a masonry structure or a garage full of equipment, should wait longer while the concrete gains strength. If anchor bolts were set in the pour, make sure they are positioned correctly before the concrete hardens, because moving them later means drilling and extra hardware.
Why did my garage floor crack near the door?
Cracks near a garage door often come from the ground rather than the concrete. The approach is typically where fill was placed after construction, and it is also where water from the driveway and roof tends to collect. Heavy vehicles turning in the same spot add stress. A contractor can check whether the slab has settled there and whether the crack is still moving before recommending a repair.
Do I need the ground surveyed before pouring a slab?
For a small shed well inside your property, a survey is often not necessary, but for a garage, workshop or anything close to a property line, knowing exactly where the lines are can prevent problems with setbacks and neighbors. Some jurisdictions require it as part of a building approval. Check with your city or county and look at your existing plat before choosing a location.
Talk through your project
Start with the address, what you want poured or replaced, rough dimensions, and a few photos of the area and any existing concrete.
Related work
Concrete Driveways
New drives, widenings and tear-outs built for clay or sandy lots.
Concrete Patios
Back patios pitched to shed summer downpours away from the house.
Stamped & Decorative Concrete
Patterned, colored and aggregate finishes, and sealers for humid weather.
Walkways & Steps
Front walks, stoops and steps with even risers and room for tree roots.
Concrete Repair & Replacement
Reading cracks to choose between sealing, lifting and a full tear-out.