"In late fall of 2021, we called David Borntreger to see if he would be able to repair the roof of our machine shed. He was there to see the project and give us an estimate within 24 hours! While there, we asked if he would be interested in enclosing a door opening which he agreed to do and gave us a fair price. We gave the ok to proceed and within Less than a week, he had completed the entire job. David was pleasant and professional to work with, prompt to respond and do the work and did quality work! We would recommend him be given serious consideration for any job you may need done!"
Your Trusted
Commercial
Roofing Contractor
Owner-operated. No subcontractors. David Borntreger personally inspects every job: flat roofs, metal, TPO, EPDM, and 24/7 emergency repairs across North Iowa and Southern Minnesota.
Free Roof Inspection
No pressure. David calls you directly.
Expect a call from David within a few hours. Urgent? Call (641) 381-3241.
What We Do
Roofing Services for Every Situation
Owner-operated commercial and industrial roofing across North Iowa: from routine repairs to full restorations. We also specialise in waterproofing and roof coatings.
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Commercial Roofing
Flat roof systems, restorations, and new installs for commercial and industrial buildings across North Iowa.
Commercial Roofing -
Commercial Roof Replacement
Full tear-off and re-roof for commercial properties. TPO, EPDM, PVC, and metal systems installed to spec.
Commercial Roof Replacement -
Roof Repair
Leak repair, flashing, ponding water, hail and storm damage. Same-day response available 24/7.
Roof Repair -
Free Roof Inspection
No-cost on-site inspection by a licensed Mason City roofer. Written findings report with photos. No obligation.
Free Roof Inspection -
Emergency Roof Repair
24/7 emergency response for active leaks, storm damage, and structural failures across Cerro Gordo County.
Emergency Roof Repair -
Roof Replacement
Steel, asphalt, and metal replacements for homes, acreages, and agricultural buildings across North Iowa.
Roof Replacement
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Roofing Services
View Services -
Waterproofing Service
View Services
How We Work
Our Seamless Process
We've refined our workflow to ensure minimal disruption and maximum quality — from the first call to final inspection.
01
Analysis
We assess your roof's condition, age, and issue history — on-site, by David personally — before recommending anything.
02
Planning
David walks you through your options — restoration, repair, or replacement — and provides a transparent, itemised quote.
03
Build
Our certified crew executes the job. No subcontractors. No surprise scope changes. David is on-site throughout.
04
Audit
Final walkthrough with David. You receive inspection documentation, project photos, and full warranty paperwork.
Why A-1
What Sets Us Apart
We operate differently than most roofing contractors in North Iowa — and that difference shows up in the work, the warranty, and the phone call you make at midnight.
Owner on Every Job
David Borntreger is on-site — not managing from a truck or an office. When you call, he picks up. When the crew arrives, so does he.
Actually Based Here
608 12th St NE, Mason City. Not a programmatic-SEO company sending crews from 200 miles away. Real local presence, real same-day response.
Restoration-First Philosophy
If a coating can add 10–15 years at 30–40% the cost of replacement, we tell you. We don't quote replacement when restoration is the right call.
Manufacturer-Certified
Certified contractor status unlocks extended warranties most contractors can't offer. That means longer coverage on every job we do.
Emergency Response
"David was there within two hours of my call on a Saturday." Verified by multiple reviews. The 24/7 line goes to David's phone — no answering service.
No Subcontractor Handoffs
Repair, restoration, replacement, and maintenance — all under one roof. The crew who starts your job finishes it. No hand-offs, no strangers.
Honest Advice
Repair, Restore, or Replace?
Most roofers default to replacement — it's the bigger ticket. We start with the honest answer. Here's how to think about your options.
Repair
Isolated leaks, storm damage, flashing failure on an otherwise sound roof.
Aging membranes, widespread substrate damage, or ponding water throughout.
Restore & Coat
Aging roof with no major substrate damage. Spray foam, EPDM, or silicone coating adds real years at a fraction of the price.
Failed decking, saturated insulation, or structural issues — those need replacement.
Replace
Substrate failure, end-of-life membrane, or situations where restoration can't solve the underlying problem.
Roofs with substrate still in good shape — restoration saves you tens of thousands.
Markets We Serve
Industries We Work In
We've worked on warehouses in the dead of January, dairy barns in the middle of calving season, and school buildings between summer sessions. The industry context matters — and we plan around it.
Manufacturing & Industrial
Minimizing operational disruption matters as much as the roof itself. We schedule around shifts and keep the work site clean.
Warehouses & Distribution
Large-format flat roof systems and energy-efficient coatings for high-bay structures across the region.
Agricultural Buildings
Machine sheds, Quonsets, grain operations, and dairy barns. We know the structures — and the stakes.
Schools & Institutional
Summer-window scheduling and multi-phase project management for occupied institutional facilities.
Healthcare & Medical
Clean-job protocols, ventilation system awareness, and scheduling sensitivity for occupied medical facilities.
Retail & Strip Mall
Multi-tenant coordination, minimal disruption to business operations, and efficient flat-roof maintenance programs.
Multi-Family & Strata
Board approval familiarity, HOA process experience, and project management for multi-unit residential buildings.
Restaurants & Food Service
PVC membrane systems for kitchen exhaust environments. Grease-resistant and built for the specific demands of food service.
Recent Work
Projects
Real projects from across North Iowa and Southern Minnesota.
"Did a great job tearing off an old roof on a Quonset and putting new steel on. One of the only contractors I have worked with that is very responsive to calls and texts. I would recommend using David and Desi."
"David provides both steel roofs which will last a long, long time and flat roof work. He did a great job on a tall steep roof. Thank you!"
"David with A-1 Roofing Services in Mason City was very professional and responsive when two skylights were blown out of my parent's machine shed during the storm/high wind in the middle of December 2021. Contacted him and in the same day he sent a quote and was able to repair the skylights. Very quality work at a very competitive price. David exceeded my expectations."
"David was great from the start to finish. The roof looks absolutely amazing! and what a good investment. David installed it very quickly and kept everything so clean. David is great and easy to work . Great company I recommend A-1 Roofing Services to anyone that need someone reliable and fair price roof."
Common Questions
FAQ
Straight answers to the questions commercial property managers and building owners actually ask.
How long does a commercial flat roof last in Iowa?
Lifespan depends on the system. TPO and EPDM typically last 20–30 years with proper maintenance. Metal roofs run 30–50 years. Iowa winters are hard on membranes — freeze-thaw cycles, ice damming, and spring UV exposure all take years off poorly maintained roofs. A restoration coating, applied at the right time, can add 10–15 years to a system that still has sound substrate.
When should I repair vs. replace my commercial roof?
Repair makes sense for isolated issues — a single leak point, damaged flashing, or storm damage on an otherwise sound membrane. Restoration (coatings) works when the membrane is aging but the substrate (decking, insulation) is still solid. Replacement is the right call when the substrate is compromised, moisture has penetrated the insulation, or the membrane has reached end-of-life. A free inspection gives you a written assessment — no upsell pressure.
Can a roof coating really extend my roof's life?
Yes — if it's the right coating for the right roof, applied correctly. Silicone, acrylic, and spray polyurethane foam (SPF) coatings are each suited to different membranes and conditions. When a coating is applied over a sound substrate, 10–15 year extensions are realistic. The key word is "sound." We inspect the substrate first — if the insulation is wet or the decking is compromised, we'll tell you coating won't hold.
What's the best flat roof system for North Iowa weather?
TPO (thermoplastic polyolefin) performs well in Iowa's freeze-thaw climate — it stays flexible in cold and holds up to UV. EPDM is also proven in this region, especially on larger low-slope roofs. For restoration, silicone coatings are highly UV-resistant and handle North Iowa's weather cycle well. System choice depends on your building size, existing roof type, and budget — we'll walk through the options during the inspection.
How fast can you respond to a roof leak?
Same day in most cases. The 24/7 emergency line goes directly to David — not an answering service. For active leaks during business hours, same-day response is standard. Evenings and weekends, we triage by severity and get someone out as fast as conditions allow. Multiple verified reviews confirm this. Call (641) 381-3241.
Do you handle insurance claims after hail or storm damage?
Yes. We document damage with photos and written reports that insurance adjusters accept. We've worked through the claim process with commercial and residential property owners across North Iowa. We'll inspect the damage, give you an honest read on what's covered vs. what's wear and tear, and help you understand the process — without inflating the scope.
What's the cost difference between roof restoration and replacement?
Restoration typically runs 30–40% of full replacement cost. On a 20,000 sq ft commercial roof, the difference can be $40,000–$80,000. Restoration also qualifies for different tax treatment in many cases (maintenance vs. capital expenditure). That said, restoration only makes sense when the substrate is solid — which is why the inspection comes first.
What's included in a free roof inspection?
A written report documenting the current condition of the membrane, flashings, drains, and substrate. We take photos throughout. We'll give you an honest recommendation — repair, restoration, or replacement — with cost ranges. No sales pitch, no obligation. If restoration is the right call, we'll say so even if replacement would mean a bigger job for us.
Do you serve Clear Lake, Charles City, and other North Iowa cities?
Yes. We cover Mason City and a roughly 60-mile service radius — including Clear Lake, Charles City, Garner, Forest City, Hampton, Osage, Northwood, Britt, and others in Iowa, plus Albert Lea, Austin, and Owatonna in southern Minnesota. If you're in the region and not sure, call — we'll tell you straight.
Do you do residential and agricultural roofs too?
Yes, though commercial and industrial is our primary book. We do residential replacements and repairs in the Mason City area, and we have significant experience with agricultural buildings — machine sheds, Quonsets, grain operations, and dairy barns. Agricultural roofing is a different animal than residential, and we treat it as such.
No Pressure. No Obligation.
Schedule Your Free Roof Inspection
David will inspect your roof, document every issue, and give you a straight read: repair, restore, or replace. Written report included. No sales pressure, ever.
No obligation. No pressure. Just a straight read on your roof.
Or call David directly (24/7)
(641) 381-3241