Two-Ply SBS Roofing in Calgary
Iron Shield Roofing installs and repairs SBS modified bitumen roofs on commercial, multi-family and residential buildings across Calgary. Two-ply SBS is one of the toughest flat roof systems available. It stays flexible in deep cold, resists hail and foot traffic, and has decades of proven performance on Alberta roofs. If you want a flat roof that is built like armour, SBS is hard to beat. Call (403) 471-9023 to talk about your project.
How SBS Modified Bitumen Roofs Are Built
SBS stands for styrene-butadiene-styrene, a rubber polymer blended into asphalt. The polymer gives the asphalt elasticity, so the membrane can stretch and recover as the roof expands and contracts through Calgary temperature swings.
A typical two-ply SBS roof is built in layers:
- A vapour retarder where required
- Rigid insulation, often tapered to direct water to drains
- A cover board for a firm, smooth surface
- An SBS base sheet
- An SBS cap sheet with a granule surface for UV and impact protection
The two plies are bonded together into a single, thick waterproofing layer, which gives SBS its strength and redundancy.
How SBS Modified Bitumen Systems Are Installed
SBS sheets can be torch-applied, heat-welded with hot air, set in cold adhesive or self-adhered, depending on the building and fire safety requirements. With torch-applied systems, the installer heats the underside of the sheet until the bitumen flows, then rolls it into place so it fuses to the layer below. Laps are sealed the same way. Our crews follow strict fire-watch procedures on every torch job.
Benefits of a Two-Ply SBS Roofing System
Durable, Watertight Protection
Two fused plies give you a thick, seamless membrane that resists leaks, punctures and wind uplift.
Efficient Installation
SBS goes down quickly in most weather, so projects stay on schedule even in cooler months.
Easy to Maintain
SBS is simple to inspect and patch. Small repairs blend into the existing roof without special equipment.
Good Value
SBS offers a long service life at a competitive installed cost, which makes it a strong long-term investment.
Built for Cold Climates
The rubber polymer keeps the membrane flexible well below freezing, so it handles Calgary winters and chinook thaws without cracking.
Choose Iron Shield Roofing for SBS Roofing in Calgary
SBS Modified Bitumen Systems
We install complete SBS roof assemblies, from insulation and cover board to base and cap sheets, flashings and drains. We work with proven manufacturers and install every system to their specifications so your warranty is protected.
IKO Heat-Welded Systems
IKO makes a full range of torch-applied and heat-welded membranes for low slope roofs. These systems are widely used on Canadian commercial and multi-family buildings.
IKO Armourplast APP Cap Sheets
Armourplast cap sheets use APP-modified bitumen with a granule surface. They offer good UV resistance and are often used where a heat-welded cap is preferred over SBS.
IKO PrevENt Fire-Rated Cap Sheets
PrevENt cap sheets are designed for roofs that need a higher fire rating, such as buildings close to property lines.
IKO Torchflex Systems
Torchflex is a torch-applied SBS line with base and cap sheets in several weights and finishes, suited to new construction and re-roofing.
IKO Fully Adhered Systems
Fully adhered systems bond the membrane to the insulation or deck across its entire surface. They resist wind flutter and work well where torching is restricted.
IKO Mechanically Attached Systems
The base sheet is fastened to the deck with screws and plates, then the cap sheet is torch-welded over it. Mechanically attached systems install quickly, need no adhesive curing time and are a cost-effective option on steel and wood decks.
Talk to Us About SBS Roofing in Calgary
SBS modified bitumen is one of the most reliable flat roof systems you can put on a Calgary building. If you are planning a replacement or need repairs on an existing SBS roof, contact our Calgary team or call (403) 471-9023. You can also read more about our flat roofing services.
IKO Mechanically Attached Systems
The base sheet is fastened to the deck with screws and plates, then the cap sheet is torch-welded over it. Mechanically attached systems install quickly, need no adhesive curing time and are a cost-effective option on steel and wood decks.
Talk to Us About SBS Roofing in Calgary
SBS modified bitumen is one of the most reliable flat roof systems you can put on a Calgary building. If you are planning a replacement or need repairs on an existing SBS roof, contact our Calgary team or call (403) 471-9023. You can also read more about our flat roofing services.
Our Calgary Service Area
SBS Roofing in Calgary: Frequently Asked Questions
Common questions about two-ply SBS modified bitumen roofs.
How long does an SBS roof last?
A properly installed two-ply SBS roof commonly lasts 20 to 30 years. Good drainage and regular maintenance help it reach the longer end.
Is SBS better than TPO?
Both are good systems. SBS is thicker and handles foot traffic and hail very well. TPO is lighter, reflects heat and has welded seams. We recommend based on your building and budget.
Can SBS be installed without a torch?
Yes. Cold-applied, self-adhered and hot-air welded SBS systems are available for buildings where open flame is not allowed.
Can you repair an existing SBS roof?
Yes. We patch punctures, re-seal laps and replace damaged flashings. SBS bonds well to itself, so repairs are durable.
