Best Uses For Pier Foundations Under Quonset Buildings

Q: Can I add a concrete floor later?

Usually, no . Adding a concrete floor after your Quonset building is already up is generally not recommended . In some cases, it may not even be possible without serious structural risk. Here’s the main issue: Quonset buildings depend on the foundation for anchoring and load-bearing support. That foundation needs to be engineered and installed before the steel arches go in place. If you pour concrete later, a few problems can show up: You can affect the building’s stability. You may disturb anchor points. Proper drainage can become harder to manage. Compaction can get more complicated. Put simply, the floor and foundation aren’t just add-ons. They’re part of what helps the whole structure stand the way it should.

Best Uses For Pier Foundations Under Quonset Buildings

If I want a Quonset building with less concrete and lighter site work, pier support can be a good fit – but only for the right jobs.

I’d sum it up like this: piers work best for light to medium-use buildings, gravel-floor interiors, sloped lots, remote sites, and seasonal structures. They are usually a poor match for heavy equipment traffic, heated finished interiors, wet or weak soils, and uses that need a full concrete floor. In many Canadian builds, pier systems can cut concrete use by 50% to 80%, but frost depth, snow load, wind uplift, and soil bearing still control the design.

If you’re deciding fast, here’s the short list:

Best fits: compact storage shells, machinery covers, open-front shelters, sloped sites, remote sites, seasonal buildings, and small utility shops
Best floor type: compacted gravel, crushed stone, or partial concrete pads
Poor fits: forklift-heavy spaces, wash bays, heated garages, bulk material storage, and buildings with large point loads
Common Canadian frost depth range: about 1.2 m to 1.5 m, with some Prairie sites reaching 1.5 m to 2.1 m
Typical pier cost: about C$200 to C$600 per pier, with deeper drilled piers costing more

A simple way to think about it: piers support the shell at set points, not across the full footprint. That can save money on concrete, but it also limits what the floor and site can handle.

The easy, cost effective way to secure your Quonset Hut to a foundation

Quick Comparison

Use case	Good fit for piers?	Why
Small storage building	Yes	Light loads and no full slab needed
Equipment or hay cover	Yes	Weather cover matters more than a finished floor
Open-front Quonset	Yes	Works well where concrete is only needed at support points
Sloped site	Yes	Pier heights can change with grade
Remote site	Yes	Less concrete delivery and less site work
Seasonal or movable structure	Yes	Less permanent concrete in the ground
Heated workshop	Maybe	Often better with a slab for insulation and sealing
Forklift or heavy vehicle use	No	Floor usually needs continuous concrete support
Bulk material storage	No	Loads shift and need continuous support
Wet or weak soil site	No / maybe not	May need grade beams, deep supports, or a slab

If I were screening a site in Canada, I’d look at load, floor use, frost depth, drainage, and soil strength before choosing piers.

When Pier Foundations Work for Quonset Buildings

Pier foundations make sense for Quonset buildings when you want to use less concrete, keep excavation light, and simplify site prep. Instead of pouring a full slab, crews drill or dig separate footings below the frost line, fill each one with concrete and rebar, and anchor the Quonset structure at those points. The big upside is simple: you can cut concrete use by a lot.

That matters even more on rural and remote Canadian properties. Ready-mix delivery can get pricey, and access roads are often narrow, soft, or only usable during certain parts of the year. When the concrete volume is smaller, you need fewer truck trips, less equipment, and you spend less time at the mercy of the weather. On those kinds of sites, pier foundations can be a practical fit.

They also work well on mildly uneven or sloped ground. Each pier can be set at the needed elevation so the base stays level even if the site itself doesn’t. On the low side of the slope, the piers are taller. On the uphill side, they’re shorter. That setup helps you avoid major cut-and-fill work and keeps site disturbance down.

Pier systems are also a good match for projects that don’t need a finished concrete floor. If the building is meant for equipment storage, hay, bulk materials, or general farm use, owners can skip the slab and use compacted gravel or crushed stone inside instead. That can make later upkeep simpler after freeze–thaw cycles.

In day-to-day use, pier foundations are usually best for light to moderate loads and simple interiors. They’re not the first pick for forklift-heavy operations or spaces that need finished floors. For heavy industrial use, a slab or engineered grade beam is usually the better route. Those limits point to a few clear use cases.

1. Compact Storage Shells

Small Quonset storage shells are one of the clearest matches for pier foundations. They usually carry moderate loads: tools, spare parts, seasonal gear, ATVs, snowmobiles, feed, or fencing materials. Because the frame legs pass the load into separate piers, you don’t need a full slab underneath.

That setup makes a lot of sense for smaller footprints. You’re supporting the building where the load actually lands, instead of pouring concrete across the whole area for no good reason.

Snow and wind still matter, of course. In Canadian conditions, arch-roof loads can be heavy, so pier size has to be engineered for the site.

Because the footprint is small and the loads are discrete, compact shells are the simplest pier-supported Quonset use case. The same idea works for open-sided covers and shelters too, where full-floor concrete just isn’t needed.

2. Equipment Covers and Machinery Shelters

For larger ground-level equipment, the same pier approach still makes sense. Farm and industrial equipment shelters are often a good match for pier foundations when the loads are light to medium and the main goal is weather protection, not a finished floor.

Piers also make sense on rural or hard-to-reach sites. Why? They can cut down on grading, forming, and concrete truck traffic. That can make the whole build a lot simpler. If the bearing soils are soft or uneven, though, you may still need deeper piers, helical piles, or grade beams. The tradeoff is straightforward: less concrete, without building more foundation than the site calls for.

In Canada, snow loads, wind uplift, and local frost depth still control the pier size, spacing, and embedment.

Open or partly enclosed layouts usually work best when airflow and easy entry matter more than a sealed interior. That’s why pier-supported machinery shelters are such a natural fit for open-front designs.

If there’s a chance the shelter could later turn into a heated workshop, wash bay, or forklift area, it’s smart to plan for a slab or grade beam from the start.

3. Open-Front Quonset Buildings

When a Quonset building stays open at the front, piers often make even more sense. For hay storage, commodity storage, or drive-in parking, an open-front Quonset can sit on piers because the structure is supported at key load points instead of needing a full perimeter footing. That said, simpler does not mean less engineering.

An open front changes how the building handles weather. Snow can drift into the opening, and wind can create more uplift pressure. So the pier size and anchor details need to match local Canadian wind and snow loads. After that, the next big limit is soil bearing capacity.

Dense, well-drained soils are usually a good fit for piers. Soft, unstable, or flood-prone sites often call for a different foundation system or a hybrid setup.

One of the main upsides is straightforward: piers cut down on excavation and concrete use because concrete is only placed at the main load points.

In Canada, frost is a big deal. Piers need to extend below the local frost depth and work with positive drainage so the foundation can handle freeze-thaw cycles.

4. Quonset Buildings on Uneven or Sloped Ground

When a Quonset site slopes, pier foundations often make more sense than major grading work. Instead of cutting into higher ground, hauling away soil, bringing in granular fill, and adding retaining walls, you can vary pier heights to follow the land and still get a level base. That means you don’t have to flatten the whole footprint just to start building. On sloped sites, piers can cut concrete use and reduce site work in a big way.

Piers tend to work best in well-drained gravel or sand. Soft clay, peat, or organic fill is a different story and should be checked with a geotechnical review before layout begins. On a sloped site, soil conditions can change from one side of the building to the other, and that’s where a geotechnical report helps lower the risk of differential settlement.

Frost is the other big issue. Changes in grade can leave some piers too shallow if the layout isn’t checked with care. In many parts of Canada, piers need to extend 1.2 m to 1.5 m below grade, or below local frost depth, based on municipal rules. Silty or clay-heavy soils are more likely to heave during freeze-thaw cycles, so granular backfill around piers and positive drainage away from the building are standard steps.

For light to moderate storage, piers paired with a compacted gravel floor are often a good fit on a sloped site. That includes uses like:

hay
seasonal equipment
small machinery

If you need to support heavier equipment, a concrete pad or a thickened entry strip is usually the better call, with support from piers or a short grade beam.

That same low-excavation edge also makes piers a strong choice for remote sites.

5. Remote and Hard-to-Access Sites

The low-concrete upside matters even more when a site is tough to reach. If you’re building on a remote acreage, in a northern yard, or at a forestry camp, getting a concrete truck in can be expensive or just not workable. Pier foundations make sense here because the concrete goes into specific support points instead of covering the whole footprint with a slab. That means crews can handle smaller pours on site or cut down the number of truckloads needed.

This setup works best for unheated equipment sheds, hay covers, and open-front agricultural buildings where the floor stays as compacted gravel or natural soil. But there are limits. For heavier uses, like large heated workshops, vehicle lifts, or high-density pallet racking, a pier-plus-grade-beam system or a full slab is usually the better option, even in a remote location.

In Canada, access is only part of the picture. Frost depth, drainage, and load design matter just as much.

Even on remote sites, piers still need to extend below local frost depth, and drainage should slope away from the building. Quonset Canada can connect you with Canadian building providers for site-specific guidance and free quotes.

6. Seasonal or Relocatable Quonset Structures

Pier foundations make sense when a Quonset building is used for part of the year or might need to move to another site later. Instead of pouring one full slab, you support the structure with separate bearing points. That means less permanent concrete in the ground. And reduced-concrete pier systems can use far less concrete than a full slab, which is a strong fit for buildings that may not stay put for long.

The pier design still needs to match the load. A pier-supported seasonal Quonset usually works well for:

light storage
seasonal workshop space
projects where a finished concrete floor isn’t needed

If you’re planning for heavy equipment traffic or year-round use, a slab or another tougher foundation system is usually the better call.

In Canada, frost depth isn’t optional. It’s a hard rule. Seasonal buildings can be hit especially hard here. If piers are too shallow, or drainage is poor, frost can lift or shift the supports over winter. Then, when the building goes back into use, alignment issues can show up fast. Footings still need to sit below local frost depth where required, and drainage should slope away from each pier.

If relocation is part of the plan, build for that from day one. In plain terms, that means standard bolt spacing, accessible anchors, and reusable hardware. The frame should be able to come apart and be lifted without damaging the shell or the piers. The goal is to treat the foundation as a set of predictable support points, not a fixed embedded structure.

That only works if the basics are done right. Pier depth, drainage, and anchoring can’t be afterthoughts. Seasonal projects tend to work best where excavation is limited, drainage is stable, and soils are well drained.

7. Low-Concrete Workshop and Utility Projects

The same low-concrete approach also works well for small, year-round workspaces. Pier foundations are a good fit for light-duty workshops and utility sheds used for hand tools, lawn equipment, ATVs, or small compressors. The key is simple: the structure still needs to be engineered for local snow and wind loads.

For a typical 7–10 m by 10–15 m workshop, piers can cut concrete use by 50–80% compared with a reinforced slab. That can trim both material and labour costs.

The main trade-off is the floor. Instead of pouring a full slab, use gravel for general circulation and place partial pads only where fixed work happens, such as a workbench area or welding corner. That keeps total concrete use low while making the space more practical where it matters most.

Piers still need to extend below local frost depth. In southern Ontario, that often means about 1.2 m. In parts of the Prairies, frost depth can reach 1.5–2.1 m. Even unheated utility buildings need piers set below frost depth on stable soil. Good drainage around each pier, along with granular backfill, helps limit freeze-thaw movement.

There’s also a useful upside when it comes to services. Plan them early. Run electrical overhead or in surface-mounted conduit, and route plumbing and drains through perimeter chases. It also helps to keep water points near perimeter walls and use insulated chases, so you don’t eat into the cost savings with harder service runs.

Key Design Factors for Pier-Supported Quonset Buildings in Canada

These uses only work if the foundation details fit Canadian site conditions. In Canada, piers need to go below the local frost depth or use an engineered frost-protection system. Check with your local building department before you size any pier.

Quonset arches push outward at the base. So the low-concrete upside only pays off if the foundation can handle that side thrust and uplift. In many cases, piers need reinforced grade beams, cross-bracing, and anchor bolts to carry arch loads.

Place each pier exactly where the manufacturer’s foundation drawings show.

Drainage matters too. Grade the pad above the surrounding soil, slope water away from the building, and add perimeter drainage in clay-heavy soils.

Costs can move around quite a bit. Frost depth, soil, site access, and code rules all affect the final price. Individual piers often run $200–$600, and deeper drilled piers can cost more. Those limits set up the comparison with slabs and grade beams in the next section.

Pier Foundations vs. Slabs and Grade Beams

Pier Foundations vs. Slabs vs. Grade Beams for Quonset Buildings in Canada

Pier foundations make sense for some Quonset projects. But they’re not the right pick for every site, floor plan, or workload.

Here’s the simple trade-off: piers cut concrete and site prep, while slabs and grade beams take over when the floor has to do more work.

Factor	Pier Foundations	Slab-on-Grade	Grade Beams
Concrete volume	Low – concrete is concentrated at discrete pier locations	High – full footprint coverage	Medium – continuous beams, often paired with a slab
Floor traffic	Moderate – mainly supports the shell; heavy floor use usually needs separate pads or a slab	High – distributes vehicle and equipment loads across the slab	High – strong structural support, usually combined with an interior slab
Uneven or sloped terrain	Excellent – piers can be set at varying heights	Poor – requires extensive grading and levelling	Moderate – can step with terrain, but still needs more continuous excavation
Remote-site practicality	High – fewer concrete deliveries and a smaller equipment footprint	Low – larger pours and more forming, finishing, and labour	Medium – less concrete than a full slab, but still more than piers alone
Installation speed	Fast – discrete pours, so erection can often follow soon after curing	Moderate – one large pour, but more prep and curing time	Slower – more forming, reinforcement, and inspection steps
Gravel floor compatibility	Excellent – interior floor can remain gravel or compacted soil	None – the slab is the floor	Partial – usually needs gravel infill or a separate slab

On flat, stable ground, slabs are often the simplest and lowest-cost option. They give you one surface that supports the shell, floor traffic, and equipment all at once. If the building will see trucks, loaders, or daily washdowns, that matters.

Piers start to shine when the job calls for less concrete, less grading, or an interior floor that can stay gravel. That’s often the case on sloped land or remote sites, where every extra pour adds time, cost, and logistics.

For Quonset buildings, grade beams usually make the most sense in a hybrid setup. They can connect piers, add stiffness, and help resist the arch’s outward thrust, especially on uneven or frost-sensitive sites.

A simple way to think about it:

Use piers for gravel-floor, sloped, or remote projects.
Use a slab when the building needs frequent vehicle traffic, anchored equipment, or a washable floor.

Those limits lead straight into the cases where a pier foundation is the wrong fit.

When a Pier Foundation Is Not the Right Choice

Piers can save money. But they’re not the right fit when a building needs concentrated support or a finished, heated interior.

Large point loads from CNC machines, vehicle hoists, presses, and heavy farm equipment need a slab-on-grade, not isolated piers. The same goes for bulk storage. Grain, sand, salt, and aggregates can shift, pile up unevenly, and change load patterns over time. Those materials need continuous support. Salt, fertilizer, and other corrosive bulk materials are also better suited to a continuous slab or grade beam system. Once loads start behaving that way, pier foundations usually give way to slabs or grade beams.

Heated Quonset buildings, like workshops, garages, and small commercial spaces, are another weak match for piers. Why? Piers leave gaps underneath the structure, and those gaps are harder to insulate and seal. A slab-on-grade is much simpler to insulate, seal, and heat. In Canadian winters, that difference matters a lot, especially when the space has a finished interior.

Site conditions can also make piers a bad bet. Wet sites and weak soils are the biggest trouble spots. Saturated soils can lose bearing capacity. Frost heave can lift piers unevenly, then let them settle again during thaw. That back-and-forth movement is hard on a structure. Weak or highly variable soils, including organic soils, loose fill, and variable native soils, often need grade beams, engineered slabs, or deep foundations instead. In plain terms, the ground under the building matters just as much as the building itself.

Get an engineered review before choosing piers.

Getting Canadian Quotes and Professional Guidance

Once a pier foundation makes sense for your site, the next move is local permitting and engineered drawings. Before you order a Quonset kit, check permit rules with your local building department.

In Canada, projects usually need stamped structural drawings from a provincial P.Eng. The pier foundation is also often engineered separately from the kit drawings. In most cases, the supplier provides the anchor-bolt layout and design loads, while a local engineer sizes the piers for your soil and frost conditions.

Set your local frost depth early and make sure pier embedment goes below it.

When you ask for quotes, send the main project details up front so providers can price the piers properly:

Location
Intended use
Building dimensions
Site slope
Soil conditions
Heating plans
Preferred foundation type

Quonset Canada connects visitors with Canadian building providers who can answer technical questions and offer free quotes through the "Price a Building" form.

It also helps to line up your Quonset supplier, local engineer, and building official before any digging starts. That way, the pier layout, anchor bolts, and code requirements all line up, and the foundation plan matches the building’s actual loads and site conditions.

Conclusion

Pier foundations are a good fit for light to moderate Quonset buildings, especially compact storage units, equipment covers, open-front shelters, and seasonal structures. They also make sense on uneven or remote sites, where a full slab can mean more excavation and more concrete.

That said, they’re not the right choice for every build. Heavy loads, regular vehicle traffic, finished interiors, and weak or wet soils often point to a slab or grade beam instead. In Canada, the foundation design also needs to line up with local frost depth, snow load, wind exposure, and provincial code rules. And even then, the lowest price shouldn’t drive the whole decision.

Cost matters. Fit matters more. Site conditions and load demands should lead the choice. For site-specific guidance and free quotes, Quonset Canada can connect you with top Canadian building providers.

FAQs

How do I know if piers are right for my site?

It depends on how the building will be used, the terrain, and your local building code. Piers can work well for unheated storage or agricultural sheds, especially when you don’t need a finished floor and the site is uneven.

That said, Quonset buildings put outward lateral force on the base. Under heavy snow loads, that force can increase. Because of that, a full concrete slab is usually the most dependable foundation option in Canada.

Consult a local professional engineer to confirm what’s suitable for your site.

Can I add a concrete floor later?

Usually, no. Adding a concrete floor after your Quonset building is already up is generally not recommended. In some cases, it may not even be possible without serious structural risk.

Here’s the main issue: Quonset buildings depend on the foundation for anchoring and load-bearing support. That foundation needs to be engineered and installed before the steel arches go in place.

If you pour concrete later, a few problems can show up:

You can affect the building’s stability
You may disturb anchor points
Proper drainage can become harder to manage
Compaction can get more complicated

Put simply, the floor and foundation aren’t just add-ons. They’re part of what helps the whole structure stand the way it should.

Do pier foundations need engineered drawings in Canada?

Yes. In most Canadian municipalities, Quonset building permits call for engineered drawings stamped by a P.Eng. licensed in the province where the building will go up.

Those drawings need to show that the building meets the National Building Code of Canada for the site’s snow, wind, and seismic loads. In many cases, you’ll also need a separate foundation plan engineered for the local site, including soil conditions and frost depth.