FAMILY-OWNED · SINCE 1979 MADISON, WI · CENTERVILLE, IA LIC. DC-080900045
24/7 STORM LINE (608) 909-9109
Modified Bitumen Roofing · Wisconsin

Modified bitumen roofing in Wisconsin, built in layers.

Multi-ply, asphalt-based membranes (SBS & APP) for flat and low-slope commercial roofs - redundant layers that shrug off foot traffic, rooftop equipment and Wisconsin freeze-thaw. Torch, cold-applied or self-adhered.

4.9 on 200+ Google reviewsRead our Google reviewsSee our BBB profileRead our GuildQuality reviewsRead our Yelp reviews·GAF Master Elite·Licensed in 24 states
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Modified bitumen roof before and after in Wisconsin
New modified bitumen roof before and after in Wisconsin
★★★★★ 4.9200+ GOOGLE REVIEWSRead our Google reviewsSee our BBB profileRead our GuildQuality reviewsRead our Yelp reviews
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    GAF Master EliteTop 2% nationwide
    FORTIFIED1 of 4 in WI
    BBB A+10+ regions
    InterNACHI100% staff certified
    4.9 / 5200+ Google reviewsRead our Google reviewsSee our BBB profileRead our GuildQuality reviewsRead our Yelp reviews
    Why modified bitumen

    Layers of protection, built to take a beating.

    Mod-bit is the tough, proven choice for low-slope roofs that see traffic, equipment and hard Wisconsin winters.

    Multi-ply redundancy

    Multiple bonded layers mean if one is breached, the others back it up. It’s the built-in safety margin single-ply can’t match.

    Tough underfoot

    Handles foot traffic and rooftop equipment (HVAC, service techs) without puncturing - ideal where people actually walk the roof.

    Flexible in freeze-thaw

    SBS-modified membranes stay flexible in the cold, moving with the building through Wisconsin’s expansion and contraction.

    UV & abrasion resistant

    APP membranes and a granular cap surface shrug off sun, heat and wear for a long, low-maintenance service life.

    Easy to repair

    Damage is straightforward and inexpensive to patch and re-seal - a big plus for facility budgets over the roof’s life.

    Proven for decades

    A long, reliable track record on commercial low-slope roofs - 15 to 25+ years with simple maintenance.

    How it’s built

    A roof in layers, not a single sheet.

    The redundancy that makes mod-bit tough comes from how it’s assembled, from the deck up.

    Base ply - anchored to the deck as the foundation of the system, sealing the substrate.
    Reinforcement layer - a fiberglass or polyester mat that gives the membrane its strength and stability.
    Cap sheet - the polymer-modified asphalt membrane (SBS or APP) that does the waterproofing.
    Granular surface - mineral granules on top for UV protection, fire resistance and abrasion durability.
    Modified bitumen cost

    What a modified bitumen roof costs in Wisconsin.

    Installed per-square-foot ranges - your written proposal is exact after a moisture scan and measure.

    2-ply SBS

    $4.50-$7per sq ft installedThe workhorse cold-climate system - flexible, tough, and cost-effective for most low-slope roofs.

    ★ Most durable

    3-ply / premium cap

    $6-$9per sq ft installedAn extra ply and a heavier granular cap for maximum redundancy and service life.

    Cold / self-adhered

    $5-$8per sq ft installedFlame-free installs for occupied or fire-sensitive buildings - no torch on the roof.

    A typical 10,000 sq ft mod-bit roof runs roughly $45,000-$75,000 installed - the number that matters is cost per year over a 15-25+ year life. Free assessment and written proposal, no obligation.

    APP vs SBS

    Two polymers, two strengths.

    Modified bitumen comes in two flavors. The right one depends on your climate and exposure - here’s the honest difference.

     
    SBS (rubber-modified)
    APP (plastic-modified)
    Cold-weather flex
    Excellent - stays flexible
    Good
    Freeze-thaw movement
    Handles it well
    Moderate
    UV & heat resistance
    Good
    Excellent
    Typical application
    Cold-applied, self-adhered, hot-mop
    Torch-applied
    Best for
    Wisconsin expansion & contraction
    High-UV, hot exposure

    Prefer a lighter, single-sheet system? Compare with PVC / TPO single-ply → - we install both and recommend what fits your building.

    Where it fits

    The buildings modified bitumen suits best.

    Mod-bit shines where roofs see traffic, equipment and heavy use - across Wisconsin.

    BGC Safe torch-down & certified

    Done to spec, and done safely.

    Torch-applied mod-bit carries real fire risk in the wrong hands - we run strict fire-watch and safe-torch practices on every install, or use a flame-free method when the building calls for it. GAF Master Elite, FORTIFIED-trained, family-owned since 1979, licensed in 24 states, with our own crews and warranty terms in writing.

    GAF Master EliteTop 2% of US roofers
    Licensed in 24 statesWI DC-080900045
    Strict fire-watchOn every torch-down
    Our own crewsNo subcontractors
    How we install it

    Four ways to apply it - we pick the safest fit.

    The method depends on your building, occupancy and fire exposure. We’ll recommend the right one.

    Torch-applied

    The cap sheet is heat-welded to the base with an open flame - fast and strong, done under strict fire-watch.

    Hot-mopped

    Layers set in hot asphalt, the traditional built-up approach for maximum bond.

    Cold-applied adhesive

    No open flame - membranes set in adhesive, ideal for occupied or fire-sensitive buildings.

    Self-adhering

    Peel-and-stick membranes for the cleanest, flame-free install with minimal disruption.

    Torching carries fire risk - we run strict fire-watch on every torch-down, or use a flame-free (cold-applied or self-adhered) method where an occupied or sensitive building calls for it.

    Building owners trust us

    4.9 stars, pulled straight from Google.

    Google reviews logoRating starRating starRating starRating starRating star  4.9 / 5 · 200+ verified reviewsRead our Google reviewsSee our BBB profileRead our GuildQuality reviewsRead our Yelp reviews
    Posted on Google Google
    Joy I profile picture
    Joy I
    Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
    When the big storms came through the Madison-area in April 2026, I immediately started looking for a reputable roofer—who also understood the importance of weather-resistant materials that can withstand hail and wind. It didn’t take me long to find Brad from BCG. We had damage that needed to be repaired before the next round of storms came through later that day and Brad had a crew out within hours. Our neighbors also had damage, and when their roofing company didn’t show up, Brad and his crew also took on fixing their damage on the spot. The contracting process was done over email and we were able to clearly understand all of the options available to us. On the day of install, the crew was efficient and fast with their work. But also, mistakes can happen. And what matters to us is not that there’s perfection (because that’s not realistic), but how a contractor deals with a mistake. As they were taking down the tarps when they were finished with the roof, one of our lights next to the garage broke. Brad helped find a replacement online and had it shipped directly to our house! Such great service! All in all, we were very happy with Brad and the service we received from him and BCG. We’ve since recommended their services to several of our friends and neighbors who also had storm damage. While I hope we won’t have to do that again for a long time, we would work with BCG again in a heartbeat!
    Posted on Google Google
    Shelly Ziegler profile picture
    Shelly Ziegler
    Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
    I am extremely pleased with the service Matt Walmer from Buckshot General Contracting (BGC) provided for me during the hailstorm damage in Madison in April. I had just switched insurance companies one year ago and was worried about how much they would cover. Matt assured me everything would be taken care of and had nothing to worry about. True to his word he immediately answered phone calls during off hours even when he was with daughter at volleyball and answering texts in seconds Matt met up with assessor and arrived 20 minutes early. During roof replacement he stopped in 3 times to check the progress and next day he came back to do a walk around to make sure the cleanup was to his standards. I have been so blessed to work with Matt at BGC as my contractor as everything went so smoothly. No problems with my insurance company and I was the first one on my block to get my roof done. I also was telling Matt about some of my neighbors having problems with their insurance and he was willing to look at their paperwork and giving them advice on how to deal with them. I can proudly say I announced to them how good Matt was and gave them his card. Thank you so much Matt for your excellent service and being a great representative for Buckshot General Contracting. These days days it’s hard to find a business that is 100% committed to making sure the customer is their #1 concern. Going to be doing more work and sticking with them as I know it will be top quality.
    Posted on Google Google
    Amy Stephens profile picture
    Amy Stephens
    Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
    We contacted BGC after storm damage and had them completely re-roof and re-side our house, garage, and shed. The entire process was incredibly smooth from start to finish. They were easy to work with, handled all the details, and made what could have been a stressful situation completely worry-free. Our contact, Jayce Kirkland, was outstanding. His professionalism, communication, and courteous demeanor were truly a breath of fresh air. He took care of everything for us and made sure the project stayed on track every step of the way. We couldn’t be happier with the experience and have and would highly recommend BGC to anyone needing roofing or siding work!
    Posted on Google Google
    Rob Anast profile picture
    Rob Anast
    Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
    Very customer focused company. Replaced my roof and siding after hail and wind damage 6 years ago. Second hail and damage storm this year and they are my vendor of choice again. In process now to replace my roof and siding.
    Posted on Google Google
    paolo masone profile picture
    paolo masone
    Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
    Brad gave me a good price and the roof looks great! The roof was replaced in one day.
    Posted on Google Google
    Doug Cooper profile picture
    Doug Cooper
    Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
    They did an excellent job! Fast, efficient and did a great job cleaning up.
    Posted on Google Google
    christos karampetsos profile picture
    christos karampetsos
    Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
    My family member needed a roof replacement after the recent storm in Madison , Chad came out to inspect the roof and went over the options with us. Full roof replacement and the new roof looks GREAT, they were done with in 2 days and left no mess behind which was very thankful for. Thanks !!
    Posted on Google Google
    Jason Montez profile picture
    Jason Montez
    Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
    *update* number 2 I have been through about 4 different people now to get my issue fixed. They came and fixed the side that was leaking. The contractor that came out confirmed the siding wasnt installed properly and put in some flashing to fix the issue. Since it wasnt installed right i wanted the rest of the house done to prevent other issues and the company agreed to do that. Still not done and now im dealing with yet another person who has not contacted me to resolve my issue. Told them when this job was completed i wanted a new patio door as well to get the last year of the energy credit. Crickets. I have been very patient, but am beyond frustrated at this point. *update* After posting i was contacted regarding my review. Turns out the reason i wasn’t contacted was because my salesman is no longer with the company and never responded to tell me that when i called him (his number was still correct at the time of the call). I had a rep come to my home and immediately discuss solutions to the issue. Everything was done properly on my home, its just one of those things no one could foresee. I am beyond happy with the speed things are moving once i was contacted. Already making plans for additional work needed next season. Had windows and siding done. The windows crew was fantastic. Personable as well as professional. Siding crew was also great. My issue comes with the after care. My basement was leaking during rains. It also leaked running the sprinkler for new grass. Contacted my salesman and never heard back. Been probably a month? Had a contractor friend of mine come look and the issue was the siding wasnt ran low enough (or a piece of flashing would have worked as well) to stop water from coming through the basement from under the sill plate. Id have even paid to have it corrected, but no call. My issue is a simple one, but the aftercare deserves a one. The total score is because their crews were great. The people in admin simply need to be better. I had to remove foam that was trafficking water in and will be using flex seal to create a barrier since no call was made back. Update as of april, 2026. After some frustrating back and forth one of their contractors came our and looked at my situation late summer of 2025. Confirmed the siding wasnt done properly and installed flashing where the leak was and i haven’t had an issue since. Despite the numerous tornados weve had. With that said, Fall of 2025 i told them (after being informed the siding wasn’t done properly by their guy) i told them while the basement no longer seems to leak, i want the rest of the house covered with that flashing incase their are other problems. i dont want to refinish my basement to discover issues. The “salesman” essentially accused me of only wanting free things and after him explaining to me how awesome he was and that i was wrong, i stopped the phone call. The subcontractors they hire are overall solid, but some of the staff have made the company unusable for me. Just be cautious if you use them. Communication is great… until they get your money.
    Frequently asked

    Modified bitumen questions, answered.

    Modified bitumen (mod-bit) is a multi-ply, asphalt-based membrane for flat and low-slope commercial roofs. The asphalt is modified with polymers for flexibility and durability, then layered over a reinforcement mat and cap sheet for redundancy.

    SBS is rubber-modified and stays flexible in cold, so it handles Wisconsin freeze-thaw well. APP is plastic-modified with excellent UV and heat resistance and is typically torch-applied. We spec the right one for your exposure.

    Torch-applied, hot-mopped, cold-applied with adhesive, or self-adhering. We run strict fire-watch and safe-torch practices on every torch-down, and use flame-free methods where the building calls for it.

    Mod-bit gives multi-ply redundancy and toughness for foot traffic and rooftop equipment. Single-ply like PVC or TPO is lighter, has fewer seams and higher reflectivity. We’ll compare both for your building.

    Often, yes. A recover over a sound built-up or existing roof can save on tear-off if the deck is dry and code allows. We start with a moisture scan and tell you honestly which is right.

    About 15 to 25-plus years depending on the system, the quality of the install, and maintenance. Regular inspections and prompt repairs get you to the top of that range.

    Where we work

    Commercial roofing across southern Wisconsin.

    Two offices - our Madison, WI headquarters and our Brodhead, WI office - serving commercial property owners across Dane & Milwaukee counties and into southern Iowa.

    ● Wisconsin · Headquarters

    Madison, WI Office

    621 N Sherman Ave, Suite B5
    Madison, WI 53704

    Mon-Sat 8AM-5PM · 24/7 Storm Line

    ● Wisconsin · Brodhead Office

    Brodhead, WI Office

    17312 W Hafeman Rd
    Brodhead, WI 53520

    Mon-Sat 8AM-5PM · 24/7 Storm Line

    Popular service areas
    Free assessment · written proposal · Wisconsin

    Let’s look at your roof.

    A free moisture scan and assessment, an honest system recommendation (mod-bit or single-ply), and a written, line-item proposal - scheduled around your operations. Own crews, licensed in 24 states, family-owned since 1979.

    FREE MOISTURE SCAN

    Request a roof assessment

    Free moisture scan & written proposal.

    ★★★★★ 4.9/5 on Google reviews logo 200+ Google reviewsRead our Google reviewsSee our BBB profileRead our GuildQuality reviewsRead our Yelp reviews

    Crew available todayFreeInspection1 dayMost installsDeductible onlyOn covered claims4.9 / 5200+ Google reviews

    ●  From the crew that writes the guides

    Done reading? Let us look for you.

    The guides tell you what to check from the ground. We get on the ladder, photograph every facet, and tell you straight: a claim, a repair, or nothing to worry about.

    Free roof inspection

    Three fields. Twenty minutes on site. Zero cost, zero obligation.

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