Mammoth Metal Structures

Not always—but it depends on the structure type.

For all of our structures, Mammoth Metal Structures can install on:

• Gravel 
• Asphalt 
• Ground / Dirt Work
• Concrete Slab

We strongly recommend going with a concrete slab for:

• Proper anchoring 
• Structural stability 
• Moisture protection 
• Long-term durability 

 Most customers investing in any one of our structures choose concrete to protect that investment.

Typical recommendations based on use:

• 4” slab → most common 
• 5”+ slab → customer preference / specific needs. Available for pricing upon request. 

But thickness alone isn’t enough—we offer additional options for long-term performance.

• Additional Options → 1' x 1' Column Post Footers, Side Walks, Ramps, Aprons, Driveways, Wire Mesh, Gravel, etc. Available for pricing upon request. 

This is where most slab failures happen if done wrong.

A proper install includes:

• Proper leveling 
• Moisture/vapor barrier
• Reinforcement (rebar) 
• Grading for drainage away from the building 

Skipping base prep leads to:

• Cracking
• Settling
• Water pooling inside your building

Yes—many engineered buildings require thickened edges or perimeter support.

Typical specs:

• Thickened edges: 12”–24” deep (depending on specific county requirements, such as Frost Lines)
• Reinforced perimeter for anchor load 

This is critical because:

• The weight load transfers to the slab edges
• Anchors rely on that depth for wind resistance 

All of Mammoth Structures come with a minimum footer size of 14" Deep x 18" Wide, following our Engineer Designed Plans.

Yes—but it must meet structural requirements.

We check:

• Thickness (usually 4” minimum, often more) 
• Condition (no major cracks or shifting) 
• Edge support strength 
• Anchor compatibility 

If the slab isn’t adequate, anchoring can fail under stress—especially in high winds.

Your slab should match or slightly exceed your building footprint.

Examples:

• 20x20 garage → 20x20 (Flush Mount Kit Required) or 20' 7" x 20' 7" Monolithic Style slab 
• 24x30 shop → 24x30 (Flush Mount Kit Required) or 24' 7" x 30' 7" Monolithic Style slab 

The Differences:

• A Flush Mount Kit is an alternative method to anchor the building away from the outer edge of the concrete to prevent a potential "blow out."
• A Monolithic Style slab is made with an extra 3.5" perimeter to allow for anchoring to take place directly through the main base rail and still be away from the outer edge of the concrete preventing a potential "blow out." A Monolithic Style is also recommended because the extra lip is usually made at a slightly lower level then the main pad. This allows for the sheet metal to overlap slightly on the bottom and taking a layer to seal off the bottom of the building from any potential water intrusion. 

Depending on client requests/ needs, we also account for selected options such as:

• Door openings (garage doors need proper clearance) 
• Water runoff 
• Walkways or apron space 
• Ramps

No.

With Mammoth Metal Structures, we handle all anchoring during the actual building installation. 

Suggestions:

• Although, understandable at times, this is one of the many reasons that we would rather handle the foundation work as well to ensure that everything is done properly and as needed. Rather then having to make adjustments to the building specifications due to an mis-poured and/ or improperly formed up concrete foundation done by another contractor. 

• 28 days → full cure strength 

We coordinate install lead times to consider and account for the time needed to fully cure a concrete foundation without delaying your project. All lead times begin at the time site photos are submitted, discussed with clients, and approved by our internal processing team. 

It depends on your goals.

Gravel pros:

• Lower upfront cost 
• Faster install 

Concrete pros:

• Cleaner look 
• Better drainage control 
• No rutting or shifting 
• Easier maintenance 
• Stronger anchoring 

For long-term use, especially for RVs or vehicles, concrete is typically the better investment.

Smart features most people overlook:

• Control joints - reduces cracking (standard on all Mammoth provided concrete slabs) 
• Broom finish - slip resistance (recommended for exterior slabs/ sidewalks and driveways)
• Trowel finish - smooth finish (recommended for interior slabs, such as flooring base for enclosed garage) 
• Thickened areas for lifts (4" thick is sufficient, but recommended 6" thickness for longevity)
• Apron extension at garage doors 
• Wire mesh - adds support and strength for longevity.

These decisions are much better to consider before the pour than after.

Yes—we coordinate concrete work based on Mammoth Metal Structures service regions, which typically include:

• North Carolina 
• South Carolina 
• Georgia 
• Tennessee 
• Virginia
• West Virginia
• Surrounding Southeast markets 

 We align scheduling so your slab is scheduled within a reasonable amount of time after ordering (considering any required permits), and once concrete is completed then the lead time for the building's installation begins.

Trying to save money on the slab.

The building is only as good as what it sits on:

• Poor base prep = shifting structure 
• Incorrect thickness = cracking under load 
• Bad anchoring = failure in storms 

The slab is the foundation of your entire investment—cutting corners here costs more later.

• Although, understandable at times, this is one of the many reasons that we would rather handle the foundation work as well to ensure that everything is done properly and as needed. Rather then having to make adjustments to the building specifications due to an mis-poured and/ or improperly formed up concrete foundation done by another contractor.