Why TPO and SBS Roofing Systems are Ideal for Flat Roofs in Cold Weather
December 24, 2025
Understanding TPO Roofing Systems
What Is TPO Roofing?
TPO (Thermoplastic Polyolefin) is a roofing membrane made in layers. While the top and bottom layers are smooth, waterproof sheets made from rubber and plastic polymers, the middle layer — often referred to as the fabric core or scrim— is a strong, woven reinforcement mesh. This mesh is usually made from polyester and gives the membrane its structural strength. Think of it like a three-layer sandwich:- The top layer resists weather, UV, and heat.
- The middle fabric scrim is like a net or fabric weave that adds tear resistance and stability.
- The bottom layer helps with adhesion and bonding to insulation or substrate layers.
Key Benefits of TPO Roofing in Cold Weather
- Superior flexibility in freezing temperatures TPO membranes remain pliable even in extreme cold, preventing cracks and tears.
- Strong seam performance Heat-welded seams create a watertight bond, reducing the risk of winter leaks.
- Resistant to mould and dirt accumulation Important when melting snow leaves standing water on flat roofs.
Why TPO Roofing Stands Out in Calgary
According to AKRoN Roofing’s TPO expertise, the product has quickly become a go-to solution for both commercial and residential flat roofs in Alberta. Its ability to handle extreme weather shifts makes it especially suited for local climates.Exploring SBS Roofing Systems
What Is SBS Roofing?
SBS stands for Styrene-Butadiene-Styrene — a type of rubber-modified asphalt. It’s used in roofing systems that come in rolls and are installed in two or more layers: typically a base sheet and a cap sheet. These sheets are unrolled directly onto the roof and stick down without the need for open flame or hot tar, thanks to their self-adhering backing. Because SBS is rubberized, it’s far more flexible and durable than traditional asphalt, especially in cold temperatures. It can expand and contract with the weather without cracking — a major advantage in Alberta’s extreme climate.Advantages of SBS Roofing in Winter
- Cold-weather flexibility SBS membranes stay flexible in freezing conditions, so they won’t crack or split during freeze-thaw cycles.
- Exceptional waterproofing The multi-layer system offers multiple lines of defence against water intrusion.
- Impact resistance SBS absorbs impacts from hail, ice, and foot traffic better than most other roofing types.
- Proven durability in Canadian climates SBS roofing is engineered to handle snow loads, ice buildup and temperature swings – all common in Alberta.
SBS Roofing for Alberta Properties
Here at AKRoN Roofing we find that SBS systems like Malarkey’s OmniSeal series are a smart, long-lastsing choice for flat and low-slope roof sections. Their cold-weather performance, self-adhered installation, and long-term durability make them especially appealing for property managers seeking low-maintenance, leak-resistant solutions in harsh climates. While TPO is a great choice for large, flat commercial roofs where reflectivity and energy savings are key, SBS 2-ply roofing systems are the go-to solution for targeted low-slope areas prone to water collection or visible to occupants or pedestrians. At AKRoN Roofing, we recommend SBS systems like Malarkey OmniSeal for:- Dead valleys where snow or water can accumulate.
- Eyebrow dormers, porches, or walk-out overhangs that are visible and exposed to heavy weather.
- Under-window areas or partial roof sections where the slope is insufficient for shingles and appearance matters.
Comparing TPO And SBS Roofing For Flat Roofs
| Feature | TPO Roofing | SBS Roofing |
| Material | Thermoplastic single-ply membrane | Rubber-modified asphalt membrane |
| Cold Flexibility | Excellent – remains flexible in sub-zero temperatures | Excellent – resists cracking in freeze-thaw cycles |
| Seam Protection | Heat-welded for watertight durability | Multi-layer with adhesive-backed sheets for added leak protection |
| Energy Efficiency | High – White surface reflects sunlight, reducing cooling costs | Not reflective; energy efficiency is not a primary benefit |
| Impact Resistance | Strong, but slightly less than SBS | Superior – handles hail, ice and snow loads in vulnerable areas |
| Colour Options | White (standard) | Limited — typically 2–3 granule colours available in Alberta |
| Best Use Case | Large flat roofs, energy savings focus | Small low-slope areas: dead valleys, eyebrows, porch roofs, window wells on second storeys |
Why Professional Installation Matters
The performance of TPO and SBS systems depends heavily on professional installation. Poorly sealed seams or improperly applied membranes can lead to winter leaks, even with premium materials. By hiring an experienced roofing company in Calgary like AKRoN Roofing, property owners gain:- Access to certified installers for GAF, CertainTeed, Elevate, and Johns Manville products
- Proper insulation and ventilation setup for maximum energy efficiency
- Expertise in drainage solutions to prevent ice dams and water pooling
- Long-term warranties backed by manufacturer standards
Seasonal Maintenance for Flat Roof Longevity
Even the best systems can benefit from occasional attention to ensure long-term performance. This maintenance should only be performed by a professional:- Assessing whether snow removal would be beneficial for your roof (most roofs can handle some snow, and water pooling is not a concern for TPO)
- Inspecting seams and edges for signs of wear after storms
- Cleaning eavestroughs and drains to prevent blockages
- Scheduling annual professional inspections with your favourite Calgary roofing contractors, AKRoN Roofing!