Commercial Roofing · Minnesota
Heat-welded TPO seams
EPDM freeze-rated to -40°F
License & Insured
Free Estimates
Licensed & Insured
MN #BC795118 | DC-052300715
5 Star Rating
40+ Reviews
IKO Certified
Master Elite Contractor
Serving Minnesota
Twin Cities Metro
The Bold North Difference
Flat roofing is the dominant commercial roofing system in Minnesota for a straightforward reason: most commercial buildings are designed with low-slope or flat rooflines that direct water to interior drains rather than over pitched eaves. The roofing system installed on these buildings has to manage standing water, handle extreme temperature swings from -30°F winters to 90°F summers, survive freeze-thaw cycling without seam failure, and remain watertight through decades of service. TPO and EPDM are the two systems that do this well in Minnesota when installed correctly — and the installation is where most failures begin.
The most common source of flat roof failure is seam integrity. TPO seams should be heat-welded — a process that fuses the membrane into a single continuous waterproof surface. Tape-applied seams are a shortcut that saves installation time but creates failure points that open up under freeze-thaw cycling. EPDM seams use bonding adhesive and seam tape applied correctly under controlled conditions. In both cases, proper seam execution is what separates a 20-year roof from a 5-year problem. We don't cut corners on seams because the consequence is your problem, not ours.
Flat roof repair is often more cost-effective than replacement when the membrane's overall condition is sound. Seam re-welding, membrane patching, drain repair, and flashing replacement around HVAC curbs and parapet walls can extend a roof's service life by years at a fraction of replacement cost. We inspect existing systems honestly and recommend repair when it makes sense — replacement when it doesn't. A free commercial inspection tells you exactly where you stand.
Options we offer
Flat Roof Systems We Install
TPO Membrane — Standard Installation
Single-ply thermoplastic membrane installed with heat-welded seams for a monolithic waterproof surface. Available in 45, 60, and 80 mil thickness. White TPO provides high solar reflectivity — an energy efficiency benefit in Minnesota summers. Installed cost range: $7–$13 per square foot.
EPDM Rubber Membrane
Single-ply rubber membrane that remains flexible at temperatures to -40°F — genuinely important in Minnesota winters where brittle membrane failures are a real risk. Generally the most cost-effective single-ply option. Lifespan of 20–30 years with proper maintenance.
Modified Bitumen Systems
Multi-layer bituminous membrane system for commercial roofs with high foot traffic around mechanical equipment. Provides excellent puncture resistance and can be applied in torch-down or self-adhered configurations.
Flat Roof Repair & Maintenance
Warranty registration documentation, inspection record, and maintenance schedule. We offer ongoing maintenance programs for property managers wanting scheduled inspections and written condition reports.
How It Works
Our Flat Roof Installation & Repair Process
01
Commercial Inspection
We assess membrane condition, seam integrity, all flashing transitions, drain functionality, and any areas of ponding water. Written report with photos within 24 hours of inspection.
02
System Recommendation
Based on your building's size, roofline, drainage, and budget, we recommend the right system — TPO or EPDM — with honest explanation of the tradeoffs. No steering toward higher-margin products.
03
Installation to Specification
Multi-layer bituminous membrane system for commercial roofs with high foot traffic around mechanical equipment. Provides excellent puncture resistance and can be applied in torch-down or self-adhered configurations.
04
Documentation & Maintenance
We assess membrane condition, seam integrity, all flashing transitions, drain functionality, and any areas of ponding water. Written report with photos within 24 hours of inspection.
Why Bold North
The Right Team For the Job
No Seam Shortcuts
TPO seams are heat-welded. Every time. Tape is a shortcut that creates freeze-thaw failure points — and the failure happens on your schedule, not ours.
Proper Drainage Before We Leave
Standing water on a flat roof accelerates membrane degradation and overloads drain systems. We verify drainage is correct before completing any installation.
Written Maintenance Programs
For property managers, we provide scheduled inspection programs with written condition reports — so you know what your roof looks like before it becomes a problem.
What Homeowners Say
Don't just take our word for it - hear from real Minnesota homeowners who've experienced our no- pressure, transparent estimate process.
It was fantastic working with Jon and Bold North Exteriors. We had just a small job for him to do and he took the time to find the exact color match and made sure it was perfect. Communication was great and would highly recommend him anytime. Whenever we need roofing done in the future, Jon is the guy we will call.
Jen Wood
They did a good job with installing two new exterior doors. Good communication, on schedule, cleaned up properly afterward.
Dawn Packard
Jon from Bold North Exteriors delivered on a tricky project for us and was top notch! I would not hesitate to use him for future needs or to recommend him to anyone.
Beth Hilden
Common Questions
Flat Roof Installation & Repair FAQ
What is the lifespan of a flat roof in Minnesota?
A well-installed TPO or EPDM flat roof in Minnesota should last 20–30 years with proper maintenance. The primary variables are installation quality — specifically seam integrity — and maintenance consistency. Bi-annual inspections that catch seam separation and flashing failures early extend service life significantly. Roofs with chronic ponding water or installation shortcuts typically fail in 5–10 years.
How much does flat roof replacement cost in Minnesota?
TPO installation runs $7–$13 per square foot for standard commercial projects. EPDM is typically 15–25% less expensive. For a 5,000 square foot commercial building, a full TPO replacement would typically run $35,000–$65,000 depending on membrane thickness, insulation, and complexity. We provide detailed written proposals after a free inspection.
Can a flat roof be repaired rather than replaced?
Often yes — if the membrane's overall condition is sound and failure is isolated to specific seams, penetrations, or flashing transitions. Seam re-welding and targeted patching can extend a roof's service life by years at significantly lower cost than replacement. Our free inspection tells you honestly whether repair or replacement makes more sense for your specific situation.
How often should a commercial flat roof be inspected?
Twice annually — spring and fall — plus after any significant storm event or major temperature event. Spring inspection catches damage from winter freeze-thaw cycling. Fall inspection ensures the system is prepared for winter. Regular inspection is the single most effective way to extend flat roof lifespan.
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