Waterproof protection
MegaDome describes the woven-polyethylene membrane as combining high strength with waterproof protection for the enclosed space.
MEGADOME WARRANTY GUIDE
Protection starts with what the building is made of.
Understand the published coverage behind PowerShield membranes, MegaDome's oval structural design and steel hot-dip galvanized after welding—before you select your Ontario building specification.
15 yr
Standard PowerShield
Prorated membrane warranty
Up to 20 yr
Elite PowerShield
Prorated membrane warranty
20 yr
Pre-galvanized steel
Limited declining warranty
25 yr
Hot-dip galvanized steel
Limited declining warranty
QUALITY MANAGEMENT
ISO 9001 supports a controlled manufacturing process.
MegaDome states that the quality management system used by its manufacturer, Les Industries Harnois Inc., holds ISO 9001 registration. This is a manufacturer-level quality-management framework—not a certification of Building Depot or a guarantee that every product can never have a defect.
For a fabric-building project, the practical value is disciplined, repeatable work: documented procedures, defined inspection points, traceability and continual improvement across engineering and manufacturing activities. That process supports consistency in components such as the oval structural tubes and fabricated membrane panels described on this page.
Documented production procedures
Inspection and quality-control checks
Traceable manufacturing records
Corrective action and continual improvement
Certification scope, status and project documentation should be confirmed against the manufacturer's current records when required for a specification or tender.
POWERSHIELD MEMBRANE
A daylighting membrane built around protection.
PowerShield is MegaDome's woven-polyethylene building membrane. MegaDome describes it as combining strength and waterproof protection with natural-light transmission, helping create a brighter working or storage environment during the day.
Large membrane panels are assembled using a hot-welding process. During production, MegaDome reports checking thickness consistency, weld strength and colour uniformity—details that matter to the finished building envelope, not just the material roll.
Standard
12 oz/yd²
23 mil (0.59 mm) membrane with high light transmission, excellent published UV resistance and a 15-year prorated warranty.
MegaDome's published fit: general storage and agricultural applications.
Elite
13.5 oz/yd²
A heavier membrane with enhanced UV additives, balanced light transmission and up to 20 years of prorated coverage.
MegaDome's published fit: harsh climates and demanding or high-traffic uses.
The right option depends on the site, building use, colour and expected exposure. Building Depot can carry the selected membrane into the project specification; the issued warranty documents govern final coverage.
POWERSHIELD BENEFITS
What the membrane contributes to the building.
The value of PowerShield extends beyond weather cover. MegaDome combines the membrane material, panel assembly and quality-control process into one specified building-envelope system.
Useful natural light
Light transmission creates a brighter daytime interior and can reduce reliance on artificial lighting during operating hours.
Large hot-welded panels
PowerShield panels are assembled using a hot-welding process to create large, continuous sections for the building envelope.
Production quality checks
MegaDome reports checking thickness consistency, weld strength and colour uniformity as the membrane panels are assembled.
UV-focused options
Standard provides excellent published UV resistance; Elite adds enhanced UV additives for more demanding exposure and conditions.
Northern-climate experience
MegaDome specifies North American-made membranes with reported performance experience in Canadian and northern U.S. climates.
UNIQUE OVAL STRUCTURAL DESIGN
More than a different tube shape.
MegaDome forms its arches from ovalized structural-steel tubes. The manufacturer states that this profile is stronger than round or rectangular tubes of similar dimensions, supporting a robust frame with efficient steel use.
- Minimum published steel yield strength of 50,000 psi
- Mechanical and chemical properties verified before processing
- Mill certificates used to validate the steel in each tube
- Clear-span floor area without centre columns
- Useful wall clearance for equipment, storage and personnel movement
CORROSION PROTECTION
Specify the steel system for the environment.
Galvanization is not a single, interchangeable specification. MegaDome publishes different protection levels so the frame can be matched to general, corrosive or highly corrosive service conditions.
Pre-galvanized structure
Structural steel is protected before fabrication, while MegaDome's bronze-welding process is designed to preserve corrosion resistance at welded areas. Published coverage: 20-year limited declining warranty.
Hot-dip galvanized arches
For corrosive environments, each dome arch is immersed in molten zinc after welding. Hardware receives a zinc-nickel coating, while other specified components remain pre-galvanized.
Fully hot-dip galvanized frame
For highly corrosive environments, arches, purlins, bracing, end frames and other frame components can be dipped after welding, with zinc-nickel hardware and stainless-steel cables.
WARRANTY SCOPE
Clear terms protect better decisions.
MegaDome describes its steel warranty as limited and declining, and its membrane coverage as prorated. Coverage is not the same as an unconditional service-life promise.
Applies to the original purchaser
Covers qualifying material or manufacturing defects
Assumes use for the structure's intended purpose
Requires manufacturer-recommended maintenance
Main-structure scope is single or double arches
Issued project documents control final coverage
MegaDome's published corrosion benchmark states that qualifying main structures should show no more than 5% surface red rust after 20 years for pre-galvanized steel or 25 years for steel hot-dip galvanized after welding, subject to the complete warranty terms.
If you need warranty support
- 1Document the condition
Take clear, dated photos and note when the issue first appeared.
- 2Gather project records
Locate the contract, specifications, warranty certificate and maintenance history.
- 3Contact Building Depot
We will help identify the relevant product and assemble the information required for review.
- 4Manufacturer review
Eligibility and the declining or prorated contribution are determined under the issued warranty terms.
OWNER CARE
Support the building's long-term performance.
Follow the project-specific owner and maintenance documents supplied with the building. Site conditions and building use differ, so those documents—not a general webpage—set the required inspection and care schedule.
Maintain membrane tension
Have wrinkles, looseness or unusual movement assessed before they create concentrated wear.
Inspect after severe weather
Document visible impact, abrasion or displaced components and report concerns promptly.
Protect the structure
Avoid unapproved drilling, welding, attachments or alterations to engineered components.
Control the environment
Use the designed ventilation and keep corrosive accumulations from remaining against the frame.
WARRANTY QUESTIONS
Know what is covered before you build.
SPECIFY THE RIGHT PROTECTION
Match the membrane and steel finish to your site.
Tell us what you are storing, your site conditions and whether the interior will be humid or corrosive. We'll help define the appropriate MegaDome specification.