Diagnose first.
Repair precisely.
Flat roof repairs that don't find the actual source of a leak fix nothing. Our diagnostic approach traces every infiltration point to its origin — then executes the repair using system-matched materials and verified technique.
Flat roof leaks require a different diagnostic approach.
A leak in a flat or low-slope roof can originate several feet — or several sections — from where water is entering the building. The horizontal surface means water doesn't fall directly through; it travels along the membrane or through the insulation until it finds a path through the ceiling. Guessing the source and patching it is how the same leak reappears three months later.
This service sits within our flat roofing division. Our technicians work exclusively with low-slope membrane systems — TPO, EPDM, modified bitumen, and built-up roofing — and apply system-specific diagnostic and repair methods to each. We don't send a residential repair crew to a commercial membrane job.
Every flat roof repair begins with a proper diagnostic. We inspect the full roof plane, test penetrations and seams, and look for subsurface moisture where the condition warrants core sampling — before we quote the repair, not after.
Source-first diagnostics
We locate the actual water entry point — not just the interior drip location. Probe testing, seam inspection, and penetration assessment included.
System-matched materials
TPO repairs use TPO materials and heat welding. EPDM repairs use EPDM bonding adhesive. Modified bitumen is torch- or cold-applied. No cross-system patches.
Seam probe verification
All heat-welded seam repairs are probe-tested before the crew leaves. We document the weld quality — not just the completion.
Drainage assessment included
We evaluate drain condition and flow at the same visit. Blocked or undersized drains are the single most preventable cause of membrane degradation.
Warranty preservation
All repairs are documented and executed in a way that preserves your existing manufacturer's warranty coverage.
What we repair on low-slope systems
Seam Repair & Re-Welding
Failed or lifting seams on TPO and EPDM systems re-welded with hot-air tooling and probe-tested to verify full weld integrity.
Blister & Delamination Repair
Membrane blisters are cut, dried, and professionally patched — not simply re-adhered over a subsurface moisture issue.
Drain Collar & Penetration Repair
Drain collar replacement, pipe boot resealing, and HVAC equipment curb reflashing. Penetration failures cause the majority of flat roof leaks.
Ponding Water Correction
Tapered insulation installation, additional drain placement, or drain modification to correct inadequate slope and eliminate standing water zones.
Modified Bitumen Patching
Torch-applied or cold-applied patches for section damage, granule loss, and surface cracking in modified bitumen systems.
Coating Application
Silicone or acrylic coatings applied over sound membranes to address surface aging and restore reflectivity — extending system life without full replacement.
Diagnostic to completed repair
Roof Plane Diagnostic
Full inspection of membrane surface, seams, penetrations, and drain conditions. Probe testing of seams and penetration perimeters. Core sampling where subsurface moisture is suspected.
Root Cause Identification
We locate the primary water entry point — distinguishing between the entry location and the interior drip location. Written diagnostic report with photographs produced before quoting.
Repair Scope & Scheduling
Written repair scope with material specifications, method, and timeline. Scheduled to minimize operational disruption for occupied commercial properties.
Repair Execution
System-matched repair materials and methods. Heat-welded seams probe-tested. Penetration flashings photographed at completion. Drainage verified before crew departure.
Documentation
Signed repair report with before-and-after photographs, method documentation, and workmanship warranty. Preserved for building maintenance records and warranty compliance.
Flat roof repair questions
Stop guessing where the leak is.
We locate the source and fix it — the first time.