Flat and low-slope roofs demand durable, watertight systems that can handle Montana’s snow loads, UV exposure, and temperature swings.
At Sisu Roofing, we install and maintain EPDM and flat roofing systems engineered for long-term protection and low maintenance—ideal for commercial, multifamily, and industrial buildings across the Flathead Valley.
Whether you’re managing a retail complex, office building, or apartment property, we deliver code-compliant, manufacturer-approved flat roof solutions designed to last.
EPDM (ethylene propylene diene monomer) is a synthetic rubber membrane known for its flexibility, weather resistance, and proven performance in harsh climates.
It’s one of the most trusted choices for flat and low-slope roofs, offering exceptional value and durability compared to traditional built-up systems.
At Sisu Roofing, our crews are trained in the proper installation of single-ply EPDM membranes, ensuring every seam, edge, and penetration is sealed for long-term protection. We also service and retrofit existing flat roofs—offering maintenance programs that extend roof life and prevent costly leaks.
Our commercial flat roofing services include:
EPDM remains flexible even in freezing conditions, resisting cracking, UV damage, and shrinkage. That makes it ideal for Montana’s freeze–thaw cycles and intense summer sun.
EPDM systems offer decades of performance with minimal upkeep. Fewer seams mean fewer leak points—helping you lower long-term maintenance costs.
EPDM can often be installed over existing substrates, reducing tear-off costs and downtime for warehouses, apartments, and retail buildings that need to stay operational.
We offer both black EPDM (absorbs heat for snowmelt) and white EPDM (reflective and energy-saving) depending on your building’s performance goals.
EPDM membranes are fully recyclable and contribute to sustainable building goals—helping reduce waste and improve overall building efficiency.
We inspect your existing roof, document current conditions, and identify areas of ponding, seam failure, or deck deterioration.
You’ll receive a detailed proposal outlining scope, materials, and warranty options—with recommendations tailored to your roof’s slope and drainage setup.
Our certified crews prep the surface, install insulation (if specified), and apply EPDM membranes with fully adhered, mechanically fastened, or ballasted methods based on your building’s needs.
After installation, we perform a complete quality check, provide photo documentation, and offer maintenance recommendations to extend your roof’s lifespan.
We install and service EPDM and flat roofing systems in Kalispell, Whitefish, Columbia Falls, Bigfork, Lakeside, Somers, Evergreen, Kila, and surrounding areas.
From small retail buildings to large apartment complexes, Sisu Roofing delivers performance and professionalism you can trust.
What is EPDM roofing made of?
EPDM is a single-ply membrane made from synthetic rubber—known for its flexibility, UV resistance, and weather durability.
How long does an EPDM roof last?
With proper installation and maintenance, EPDM systems can last 30–40 years, even in Montana’s demanding climate.
Can you repair my existing flat roof?
Yes. We specialize in EPDM roof repairs, seam sealing, and leak detection to extend your roof’s lifespan without a full replacement.
Is EPDM better than TPO or PVC?
Each has its place. EPDM excels in cold climates and flexibility, while TPO offers higher reflectivity. We can evaluate your building and recommend the best option.
Do you help with storm or insurance claims?
Yes — we provide detailed inspection reports and documentation to support your insurance claim and ensure fair coverage.
Ready to protect your building with a long-lasting EPDM system?
Call (406) 885-6522 or contact us online to schedule your free flat roof inspection today.
Sisu Roofing – Built for Montana’s Weather.
Homeowners call us when they want clear communication, clean job sites, and roofs that hold up to real Montana weather.
Malarkey Certified Installer – Access to upgraded shingle systems & manufacturer-backed warranties
Licensed & Insured – Proper coverage for your home and our crew
Local & Accountable – Based in Kila; serving all of the Flathead Valley
We believe great projects start with clear expectations. Here’s what you can count on every time we show up:
Straightforward Quotes – No upsells or hidden costs
Respect for Your Property – Clean job sites and full debris removal
Reliable Scheduling – We show up when we say we will
Follow-Through – We inspect every detail before we call it complete
Emma Robertson
Business Owner
Emma Robertson
Business Owner
Steve Cohen
Small Business Owner
Michael Dell
First-Time Homeowner
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