Flat Roof Systems
TPO, EPDM, and modified bitumen for low-slope roofs.
Flat roofs are a different animal. They move, pond, and carry loads that steep-slope roofs never see. NextGen HIG installs and repairs low-slope systems — TPO, EPDM, and modified bitumen — specified for your building's actual conditions, not a generic application.
We work on residential additions, row-home rear extensions, commercial buildings, and mixed-use properties across New Jersey, Pennsylvania, and Connecticut. Every job starts with a drainage assessment because the membrane only matters if the water has somewhere to go.
Our flat-roof installations include heat-welded or adhered seams, full perimeter terminations, properly flashed penetrations, and manufacturer-backed warranties on both materials and workmanship.
Every flat roof systems project includes
Drainage Assessment
Slope verification, drain inspection, and tapered insulation recommendations where needed.
TPO / EPDM / Mod-Bit
Three membrane options, specified to your building and budget.
Heat-Welded Seams
TPO seams heat-welded for monolithic waterproofing — not taped.
Full Perimeter Detailing
Termination bars, counter flashing, and edge metal installed correctly.
Penetration Flashing
Custom boots and target patches on every pipe, vent, and curb.
Manufacturer Warranty
Eligible for 15–25 year manufacturer warranties on certified systems.
Signs you need flat roof systems
Catch these early and flat roof systems repairs stay simple — ignore them and you're paying for interior damage on top of the exterior fix.
Standing water more than 48 hours after rain
Ponding past 48 hours accelerates membrane breakdown, invites algae, and concentrates weight on the deck. Tapered insulation or drain correction is usually the fix.
Visible seam separations or bubbles
Lifted or blistered seams on TPO or EPDM let water below the membrane. Blisters in modified bitumen indicate trapped moisture. Both shorten roof life fast if untouched.
Cracked or exposed flashing
Perimeter terminations, curb flashing, and pipe boots dry out and crack before the field membrane fails. Most flat-roof leaks start there.
Interior ceiling stains or dampness
On a flat roof, water can travel far before it shows up inside. One wet spot usually means several membrane issues upstream.
Roof is 15+ years old
Most single-ply membranes start showing wear at 15 years. If you're past that mark with no maintenance records, schedule an inspection before a minor issue becomes a tear-off.
Clogged or undersized drains
Scuppers, drains, and gutters sized for lighter rain events overflow under modern storm intensity. Upgrading drainage is often cheaper than repeated water-damage repairs.
Systems we install for flat roof systems
We don't push a preferred brand — we spec the system that fits your building, climate, and ownership horizon. Here's what we install and when each makes sense.
TPO (thermoplastic polyolefin)
White, reflective single-ply with heat-welded seams. The current commercial standard — good heat reflection, strong chemical resistance, 15-25 year manufacturer warranties. Best for most new commercial and residential low-slope applications.
EPDM rubber
Black synthetic rubber with taped or adhered seams. Proven over 40+ years in the field. Excellent at temperature cycling and cold weather — often the right pick for rooftop HVAC fields and buildings with heavy mechanical traffic.
Modified bitumen (mod-bit)
Torch-down or self-adhered asphalt-based membrane. Affordable and repairable, typical 15-20 year lifespan. A good fit for smaller residential flat sections like additions or rear extensions.
Built-up roofing (BUR)
Multi-ply asphalt and felt with a gravel or cap-sheet surface. Older technology but still specified on specific commercial retrofits where compatibility matters.
Silicone and acrylic coatings
Restoration coatings that extend existing membrane life 10-15 years. Best on sound membranes nearing end-of-warranty — not a fix for compromised systems.
Tapered insulation systems
Rigid polyiso boards cut to positive slope, eliminating ponding and improving thermal performance. Specified with every new install where the deck is flat or sagging.
How it works
- 1
Site Visit & Measurements
Full roof inspection, drainage analysis, and penetration count.
- 2
System Specification
Written recommendation with material, insulation, and warranty options.
- 3
Installation
Tear-off or overlay (when eligible), installation, and inspection.
- 4
Final Walkthrough
Water test on drains, warranty registration, and handoff.
Why choose us for flat roof systems
- Licensed & insured — NJ HIC 13VH12075600, PA HIC PA185062, CT HIC 0701438. GL and WC on every crew.
- In business since 2006 — nearly two decades of craftsmanship you can verify.
- Written warranties — manufacturer + workmanship warranties, registered and documented.
- Local crews — no day labor, no subcontractor shuffle. Trained people on every job.
Service areas covered
We provide flat roof systems services across New Jersey, eastern Pennsylvania, and Connecticut.
Frequently asked
- TPO and EPDM systems typically last 20–30 years when installed correctly. Modified bitumen is often 15–20 years. Lifespan is driven more by installation quality and drainage than by material choice.
Ready to get started?
Free estimate. No-pressure consultation. Local crews, licensed and insured.