What’s Included
- FREE State-Stamped Engineered Blueprints
- FREE Project Consultation
- EASY DIY Construction
- 50-year warranty**
- Sizes starting at 20ft W
- Comes with: steel arches, base connector plate, hardware, state-stamped blueprints & instructions
Unlock the hidden potential of your shipping containers with SteelMaster’s revolutionary container cover roof system. Our innovative steel cover kits turn ordinary shipping containers (Conex boxes, sea cans, or ISO containers) into extraordinary functional spaces by bridging the gap between two containers with a durable, weather-resistant roof.
Almost instant workshops, covered storage, equipment shelters, all at a fraction of traditional building costs. Our economical solution maximizes your investment while delivering industrial-grade protection.
*Sales and use tax are not included in price. Buildings are designed using standard keyway foundation and SteelMaster does not provide installation services. All projects are sold as DIY.
**Exclusions apply; see warranty for details.
- Add-ons: Endwalls, doors, window frames & insulation
- WxLxH standard model minimum: 20ft W x 20ft L x 7ft H (height not including container height)
- WxLxH standard model maximum: 40ft W x 40ft L x 14ft H (height not including container height)
- Steel gauge minimum: 22-gauge*
- Steel grade: 80 grade
- Corrugation depth: 7.5in
- Corrosion protection: Galvalume Plus
- Standard hardware: Grade 2 hex bolts with NZF3000 commercial grade coating & serrated hex head locking nuts
Other sizes available, ask for details!
*Arches are priced in standard 22-gauge and may not meet your snow and/or wind load requirements. Buildings can be designed in thicker steel to meet higher wind and heavier snow loads. Consult with your building specialist for further details.
- Minimal maintenance: Avoid the regular maintenance of wood, fabric or aluminum roofs
- Strongest steel: At 80,000psi, our steel is 4x stronger than competitors.
- Snow & wind-rated: Can be designed to withstand up to 300psf of snow load and hurricane-force 190mph winds.
- FREE state-stamped blueprints: Engineer-approved and provided for permitting.
- DIY construction: Assemble arches, raise and connect the roof in days, not weeks, with a small crew
- 50-year warranty* from the date of purchase
- Open floor plan with 100% usable interior space
- Anti-corrosive coating: (AZM180) of Galvalume Plus — maintenance-free, no painting required.
- Typical height: Between 7ft H to 14ft H
*Exclusions apply; see warranty for details.
Every aspect of your Quonset can be designed to fit your needs. SteelMaster offers add-ons, or you can locally source these building options.
- Steel-framed openings
- Steel endwalls
- Custom endwalls
- Overhead & canister garage doors
- Man door/service doors
- Arch panel skylights
- Turbine & louvre vents
- Insulation
- Window frames
Choose between two models, depending on the look or engineering standards you want. When you work with SteelMaster, you get access to experienced building engineers certified in all 50 states to help you select the right container cover model.
- R Model – Arched roof, most common choice
- X Model – Angled walls with pitched roof

Not sure if a Quonset container cover is right for you?
Check out our resources to learn more about arch building kits.