Not every roof in Montana is steep and shingled. If your home has a flat or low-slope section—like a porch, addition, garage, or modern cabin—you need a roofing system that keeps water out year-round.
At Sisu Roofing, we install durable EPDM rubber roofing systems designed for the Flathead Valley’s extreme weather. Built to handle heavy snow, UV exposure, and freeze–thaw cycles, our flat roof solutions combine performance, efficiency, and peace of mind.
EPDM (ethylene propylene diene monomer) is a synthetic rubber membrane commonly used on commercial buildings—but it’s also an excellent option for residential homes with flat or gently sloped roofs.
Unlike shingles, which rely on overlapping layers, EPDM provides a continuous watertight barrier that won’t crack, blister, or split when temperatures swing from -20°F to 100°F.
Our trained installers ensure every seam, edge, and penetration is sealed properly—delivering a clean, long-lasting finish that’s built to protect your home for decades.
Our residential flat roofing services include:
EPDM remains flexible in extreme cold and resists cracking, UV damage, and thermal stress—making it ideal for Montana’s unpredictable climate.
When properly installed, EPDM roofs can last 30–40 years, outperforming most traditional materials on flat surfaces.
Because it’s a single-ply membrane with very few seams, EPDM requires little upkeep—just periodic inspections to ensure continued watertight performance.
Available in both black (for snowmelt and heat retention) and white (for reflective, energy-saving performance), EPDM can be tailored to your home’s location and design goals.
Many homeowners in the Flathead Valley choose EPDM for modern designs, cabin extensions, or mountain homes that feature a blend of flat and pitched roof sections.
We assess your current flat roof, check for drainage or seam issues, and provide a clear, no-pressure estimate.
Our crews protect siding, landscaping, and surrounding rooflines while removing any old materials or failed membranes.
We apply insulation, underlayment, and EPDM membranes according to manufacturer and Montana building standards, ensuring every seam is sealed for long-term protection.
Each job ends with a full inspection, magnet sweep, and photo documentation so you can see the quality for yourself.
We install and service residential EPDM and flat roofs in Kalispell, Whitefish, Columbia Falls, Bigfork, Lakeside, Somers, Evergreen, Kila, and throughout the Flathead Valley.
Whether you’re repairing a leaky addition or installing a new flat roof on your cabin or home, Sisu Roofing delivers durability built for Montana’s weather.
What does EPDM stand for?
EPDM stands for ethylene propylene diene monomer—a synthetic rubber membrane used for flat and low-slope roofs.
Is EPDM a good choice for homes?
Yes. It’s ideal for porches, garages, or additions where shingles aren’t effective due to low slope.
How long does an EPDM roof last?
Typically 30–40 years with proper installation and minimal maintenance.
Can EPDM be installed over my existing roof?
In many cases, yes. We’ll inspect your roof to determine if a recover system is appropriate or if a full tear-off is needed.
Do you offer color or energy options?
Yes—black and white membranes are available depending on whether you want snowmelt efficiency or energy savings in summer months.
Ready to upgrade your home with a dependable flat roofing system?
Call (406) 885-6522 or contact Sisu Roofing online to schedule your free inspection and estimate.
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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