Flat and low-slope commercial roofing is what we do — installed, repaired, and replaced. As the contracting and consulting side of a coordinated group of Wisconsin property brands, Alliant delivers single-ply, metal, and multi-ply systems backed by manufacturer-backed warranties, plus roof and construction consulting and technical evaluation.
Commercial roofs carry demands a residential crew never sees — vast uninterrupted spans, low-slope and flat membrane assemblies, rooftop HVAC and equipment penetrations, and tight tie-ins to building envelopes. The systems, the detailing, and the warranties are all different.
Just as critically, the building has to keep operating. A failing roof over a hospital, school, warehouse, or retail center isn't an inconvenience — it threatens operational continuity and the assets underneath. Our work is calibrated to protect both the structure and the business running inside it.
Acres of flat membrane demand correct drainage design, seam integrity, and detailing that won't pond or leak.
We sequence work to keep your facility running — phasing, equipment protection, and minimal disruption.
The roof is the first line of defense for inventory, equipment, and tenants. We treat it that way.
Certified installation methods unlock long-term system warranties from the membrane manufacturers themselves.
We match the system to the building, the budget, and the conditions — not the other way around. Here are the commercial roofing systems we work with most.
An energy-efficient single-ply membrane with heat-welded seams that form a continuous, watertight bond across the roof field. Its reflective white surface reduces cooling loads, making TPO one of the most popular choices for modern commercial roofs.
A durable synthetic rubber single-ply membrane with a long, proven track record on large flat roofs. EPDM handles wide temperature swings and weathering well, and its large sheet sizes mean fewer seams across expansive roof areas.
Long-life metal roofing systems with concealed fasteners and raised seams that shed water and resist uplift. Engineered for decades of service, metal systems offer strong resilience against hail and high winds — important across Wisconsin's storm season.
A multi-ply asphalt-based system that builds redundant layers of protection across the roof. Its reinforced, layered construction stands up to foot traffic and rooftop activity, making it a dependable choice where the roof sees regular access.
Whether you've taken storm damage or you're planning ahead, our roofing services cover the full lifecycle of a commercial roof.
Detailed evaluation of membrane bruising, punctures, seam separation, and impact damage after severe weather.
Honest, condition-based recommendations on whether a targeted repair or full replacement is the right call.
Scheduled and post-event roof inspections with photo documentation of current condition and problem areas.
Rapid temporary protection to stop active leaks and limit interior damage while a permanent fix is planned.
Thorough, defensible documentation of roof damage, prepared to coordinate directly with your carrier and adjuster.
Certified installation methods that qualify your new roof for long-term, manufacturer-backed system warranties.
Beyond installation, Alliant is the contracting and consulting side of the group — advising owners, managers, and partners on roofing and construction decisions with documented, technical analysis.
Independent guidance on system selection, service-life planning, condition assessment, and roofing scope — so the right decision is made before the work begins.
Scope review, repair-method advisement, and project guidance for commercial construction and reconstruction — coordinating contracting work with the broader claim and rebuild.
Detailed technical evaluation of roofing and building conditions, documented to support repair-versus-replacement decisions and coordination with carriers and adjusters.
If hail or high winds hit your commercial roof, the right documentation and a clear insurance process make all the difference. We document damage to insurance-grade standards and coordinate directly with your carrier — see how our claims support works.
Tell us about your building and your roofing or construction concern. A commercial specialist will follow up within one business day to schedule an on-site assessment.