Shipping Container Roof Kits and Covers in Ontario: The Two-Container Canopy Guide

Quick answer: A shipping container roof kit spans a prefab steel roof between two parallel containers. It turns the pair into a covered shed, workshop, or equipment bay in a weekend instead of a building season. Canadian vendors like Future Buildings and Toro Steel supply the kits. Van Blanc supplies the part underneath: two matched, structurally sound containers, standard or high cube, placed level at your spacing, which is what the whole structure stands on. Van Blanc can also cut roll-up doors, man doors and vents into the pair at the yard before delivery.

By Christian LeBlanc, second-generation operator, and Paul LeBlanc, owner, Van Blanc Ent. Inc.

How Does a Two-Container Roof Kit Work?

A two-container roof kit parks two shipping containers parallel and spans the gap between them with a prefab steel roof. The same product also sells as a shipping container cover or a sea can roof. The build turns the pair into walls, lockable storage on both sides, and covered work space in the middle, all assembled in a weekend. The two containers are the foundation, the walls, and half the value of the build.

Arch-style roofs drop a curved steel span onto the container tops; straight-wall kits build vertical extensions first for full-height clearance across the span. Either way, the boxes do the structural work, so the canopy is only as honest as the pair underneath it. The fabric version of the same idea is a named product at one Ontario builder, and the Britespan review reads its Container Top Sets from the container side.

“The roof gets all the attention, but the containers are doing the structural work,” says Christian LeBlanc, who runs the Brantford yards with his father Paul. “A kit that lands on two level, casting-sound boxes goes up clean. A kit that lands on a mismatched pair, or boxes that were never placed square, fights you the whole way.”

Christian has four years of direct yard experience and grew up around the trade, traveling to Asia with Paul, who founded Van Blanc in 1995.

The applications cut across industry lines. Ontario farms run this build for tractors and implements. Contractors run it as a yard shop. Townships and utilities run it for sand, salt, and fleet cover. The pattern repeats because the economics repeat: the structure goes up in days on ground that would still be waiting for footings under a conventional building. The same matched pair that carries a roof kit today can be split back into two standalone storage units later, which is a flexibility a poured building cannot offer.

Shipping Container Roof Kit Types Sold in Canada

Shipping container roof kits come in two main shapes. Arch (Quonset-style) kits are the workhorses: curved galvanized panels, efficient snow shedding, simple assembly. Straight-wall kits trade some of that simplicity for square interior clearance, which matters when the bay houses a lift or tall implements. Canadian suppliers include Future Buildings and Toro Steel Buildings, both selling container-cover systems sized to common spans, with options like end walls, skylight panels, and vents. Van Blanc supplies the containers under these kits, so read that list as a starting point for quotes, not an endorsement of one brand over another. The same span can also be enclosed into a finished bay later. That is the kind of conversion work our team scopes through our walkthrough of yard build-outs if the canopy grows into a closed shop. One fabric builder that publishes sea containers as a base is reviewed in the Cover-Tech review, with what the boxes underneath need.

Three more shapes fill out the container roofing market. Gable kits put a peaked roof on straight sidewalls, so the steep pitch sheds snow and the bay keeps full height right to the container edges. Fabric canopy kits stretch a PVC cover over a galvanized frame; they go up fastest and suit seasonal or temporary cover. Lean-to kits run a single-slope roof off one container’s side, down to a post line or a second, lower structure. A lean-to over one 20ft container on its own is the shipping container with roof that a narrow yard can fit. Whichever shape you price, the seacan roof kit is only as square as the two boxes it lands on, and Van Blanc places those boxes.

Roof Kit Mounting: Corner Castings, Not the Roof Sheet

A roof kit should mount to the corner castings or clamp to the top rail, never to the thin roof sheet. A container carries its rated strength through its corner posts, the same points a crane lifts from and a twistlock locks to. Quality kits transfer load there and leave the roof panels alone. Systems that bolt into corner castings without welding preserve the container’s structure, its warranty conversation, and its resale value. If a kit’s instructions start with cutting or welding the roof sheet, ask harder questions. The casting connection is the same load path that lets these boxes stack four and five high in a port. Van Blanc covers that load story in our guide to how containers carry weight through their corners.

The roof sheet itself is thin by design. ISO 1496-1 tests a container roof with 300 kg spread over a 600 mm by 300 mm patch. That load is meant for people working on top, not a season of snow. A shipping container roof kit carries its own weight and its snow to the castings and posts, which is the whole reason it works. Kits for two containers set side by side also come as inside-mount or outside-mount. An inside mount bolts to the inner top edge of each box and narrows the clear span a little. An outside mount sits on the outer edge, keeps the full span and leaves the container tops reachable. The kit maker’s drawing sets which one, and the container pair is placed to suit it.

Sea Can Pairs Under a Roof Kit: What They Need

The two containers underneath a roof kit need three things: matched heights, sound corner castings, and level, well-drained bases set parallel at the kit’s specified spacing. The pair should match in height, two standards or two high-cubes, never one of each, and Van Blanc carries both heights in 20ft and 40ft. Corner castings need to be sound, which is a structural check. Damaged castings are replaceable, because Van Blanc stocks the casting and gasket hardware and treats the swap as a repair. And the foundations matter more than usual. The kit ties two independent boxes into one structure that catches wind across the span and carries Ontario snow. Both containers want level, drained bases at the exact spacing the kit specifies, with anchoring to suit the site. Our field guide to pads and foundations covers the base options, and our tie-down guide covers the wind side of the question.

Grade is the budget lever, not a structural one. Wind and Water Tight units carry roof kits exactly as well as prettier steel, because the castings, not the paint, do the work. That typically makes the container pair the most affordable part of the whole structure. If the canopy faces the road or carries signage, a factory-new pair is worth pricing too. Our page on ordering new (one-trip) boxes explains when the cleaner steel earns its keep. Our breakdown of the four condition grades walks the full trade-off so you can match the grade to the job.

Container pairs come in the standard container lengths and heights, and each pair sets three numbers for the whole build. They are the wall height the roof starts from, the length of the covered bay, and the lockable storage on each side. Most roof kits are sold to span about 20 feet between the boxes, so the coverage column uses that span; wider kits scale it up.

The high cube pair lifts the whole roof a foot, which buys clearance for a tractor cab, a lift or a box truck under the arch. The 40ft pair doubles the bay and turns the boxes into long walls that block wind along the full run. Every pair in the table comes from the same rows: a matched pair of 20ft standards, two 40ft standard boxes or a high cube 40ft pair for the taller bay. Van Blanc can also cut roll-up doors or man doors into the inward-facing walls at the yard before delivery, so both boxes open straight into the covered bay.

The snow-load question every Ontario roof kit has to answer

A roof kit spanning two containers is a roof, and in Ontario a roof has a design number attached to it whether anyone checked or not. The Ontario Building Code’s climatic data assigns every municipality a ground snow load, the one-in-fifty-year value an engineered structure is designed against. The spread across this province is the part that should change how you shop.

Read the top and bottom of that table together. The ground snow load in Sault Ste. Marie is more than three times Toronto City Hall’s, and Caledon, inland and higher, carries more than twice the lakeshore figure. A roof kit that is adequate bolted to castings in Hamilton can be underbuilt for the same buyer’s property in Caledon or up north. Nothing about the kit looks different, which is why the snow math on a bare container roof matters before you order. Ajax sits at 1.0 kPa in the table, and buyers there can see containers delivered to the Ajax lakeshore before pricing a kit.

So one question matters more than price or span. What snow load is this kit engineered for, and is that number at or above the ground snow value where it will stand? A vendor who can answer with a rating and a stamp is selling you a structure. A vendor who answers with a shrug is selling you sheet metal. For engineered design, Article 4.1.6.2 of the Ontario Building Code uses the formula S = Is[Ss(Cb Cw Cs Ca) + Sr]. The basic roof factor Cb is 0.8 for most roofs. A local engineer runs it in minutes against your township’s SB-1 value, and it is cheap insurance on a span that carries a winter of snow over your stored equipment.

Our part in this stays the honest one from the rest of the page. Van Blanc supplies the two containers underneath, straight, level, and structurally sound, and cargo-worthy castings are the anchor points a kit maker’s engineering assumes. The roof and its rating belong to the kit manufacturer and your engineer. A good kit maker asks for your postal code before quoting, precisely because of the table above.

Pole Barn Comparison for Covered Storage

A two-container roof kit and a pole barn solve the same covered-storage problem from opposite directions. A pole barn offers a wide clear span and stays where it is built. The container canopy goes up in days, locks on both sides, and moves when the operation does. The containers lock like vaults while a pole barn’s open walls protect nothing until more construction goes in. And when the operation moves or the layout changes, a canopy disassembles and the containers go back to being containers. Here is the honest side-by-side:

The full comparison, including footings, span and resale for an Ontario yard, lives in our deeper look at canopy builds against conventional barns.

Build Steps and Who Does What

A container canopy goes up in a set order, and most of the trouble on these builds starts when the order gets skipped. Van Blanc’s part is the first half: the two boxes, any doors cut into them, and the drop.

1. Pick the kit and its span. Get the kit maker’s snow rating for your postal code in writing before anything is delivered.
2. Prepare two level bases at the kit’s spacing, measured centre to centre the way the drawing shows it.
3. Take delivery of the matched pair. The truck needs a clear path about 12 ft wide and at least 14 ft of overhead, and each box is set down parallel to the other.
4. Check level and square. Measure both diagonals between the outer corner castings; equal diagonals mean the pair is square.
5. Mount the brackets to the castings or the top rail, never the roof sheet, and anchor the boxes for wind.
6. Raise the roof, then the end walls, and add vents, gutters and lighting the kit allows.

Once the roof is up, the yearly check is short. Re-tighten any fasteners that have loosened, clear debris from the valleys and gutters, and touch up scratched galvanizing before rust starts. On the containers, keep the door gaskets clean and the vents clear, and the pair will outlast the roof.

Sea Can Roof Kit FAQ

Containers for Your Canopy Build

Van Blanc Ent. Inc., 90 Morton Ave E Unit 1B, Brantford, ON N3R 7J7, 519-754-6844. Come walk the rows and pick the two boxes, standard or high cube, that your kit maker’s drawing calls for. Bring the span and the kit model, and we will match the pair, cut any doors into the inward walls, and set the delivery date.

Related: Tying canopies down for Ontario wind · How both boxes get placed level on site · Why the corner castings carry the load · Browse the container yard