- (406) 390-1275
- Billings, MT
Commercial flat roofing is about executing the spec, hitting the schedule, and delivering a roof that performs long-term. We work with general contractors and property developers on new installs and re-roofs, with certified crews and the right equipment to weld and seal systems correctly.
Certified in GAF, DuraLast, IB, and EPDM systems, with installs completed to manufacturer requirements.
Performance comes down to seams, drains, edges, and penetrations. We focus on details so the roof stays watertight and warranty compliant.
Many jobs are multi-story. We plan access and fall protection so crews can work safely on the roof.
You’ve got specs. You’ve got a timeline. You need a certified contractor who delivers on both. Let’s talk about your project.
We specialize in commercial flat roofing for new construction and reroofing/replacement projects. If your project requires certified installation, a reliable timeline, and warranty-backed performance, we’re your partner.
On paper, flat roofing can look simple. In reality, performance comes down to details like seam welding, drain tie-ins, parapets, curbs, and penetrations.
Commercial flat roofing isn’t just about laying material. It’s about material knowledge, installation precision, and understanding how water moves across a roof. One missed seam or improperly flashed detail can turn into leaks, liability, and expensive callbacks. We’re certified in the systems we install, so we follow the application requirements, warranty conditions, and performance specs on every roof.
“As a Superintendent for Langlas, I’ve worked with J&B Construction on previous projects, and they delivered excellent workmanship and dependable service.”
– Jeff Niles
Langlas & Associates
“We’ve worked with J & B Contracting as a general contractor on multiple commercial and high-end residential projects in the Billings area, and they consistently stand out as one of the best subcontractors I partner with. From day one, their communication is exceptional—they provide clear, timely updates on progress, timelines, and any potential issues, making coordination seamless and keeping the overall project on track without surprises.
The crew is hardworking, highly knowledgeable, and professional. They maintain a clean, organized job site every single day, which respects the property, other trades, and safety standards. Most importantly, their workmanship is top-tier. Quality materials and attention to detail mean no callbacks or rework—everything is done right the first time, saving time and headaches for everyone involved.
If you’re a GC looking for a reliable, trustworthy roofing/steel/insulation sub in Montana, J & B is the team to call. Highly recommend!”
– Charlie B.
Brewer Construction
“It has been a pleasure to be able to work with Brook and J&B Contracting for the past 20 years as his Commercial Roofing supplier. His knowledge and abilities to offer many different scopes of the building envelope systems rate him well above his competition.”
– Bill Collett
MaCon Supply
“Brook and Justin are professional and kind. They will make sure the job is done right the first time!! I recommend them quite often and will continue to do so!”
– Jesse K.
Great Northern Metal
“These guys are the real deal. Professional, hardworking, and overall great to work with.”
Customer
“I had a fantastic experience. The team was knowledgeable, responsive, and went above and beyond to ensure my satisfaction. I’ll definitely be a repeat customer.”
Customer
