Commercial Roof Leak Repair
When the stain inside sits several bays away from any obvious flaw, leak tracing finds the lap or flashing before the flat roof repair begins.
Commercial roof leak repairLow-Slope Membrane Roofs
Casa Grande Flat Roof Repair
We repair flat roofs on Casa Grande warehouses, stores, and offices, fixing the seams, drains, scuppers, and flashings where low-slope membranes let water in.
- TPO, EPDM, built-up, mod bit
- Drains and scuppers cleared first
- Core cuts where leaks showed
- Repairs matched to the membrane
Can This Flat Roof Be Repaired?
Repair holds on a flat roof when the membrane is still flexible and the insulation under the leak is dry.
Repair Fits
- One or two leak points under a membrane that still bends without cracking
- Seams lifting at the edges while the sheet itself is intact
- Drain or scupper flashing failed, with dry insulation around it
- Blisters in a built-up roof confined to a small area
- Curb or pipe flashing pulled loose by service traffic
Needs More Than A Repair
- Membrane cracks when folded, or crumbles underfoot
- Core cuts find wet insulation well beyond the leak
- Ponding covers large areas long after storms end
- Seams opening across most of the roof
- Deck rust or soft spots near the drains
Where Flat Roofs Let Water In
On a membrane roof the weak points are where the sheet ends, turns, or gets cut for a penetration.
Heat-Welded And Taped Laps
TPO laps are welded and EPDM laps are taped. Either one opens along its edge first, so the probe runs the full length of each lap near the leak.
Drain Flange
The membrane is clamped into the drain bowl. Once the clamping ring cracks, water runs under the sheet and soaks the insulation around the bowl.
Curb Corners
Inside and outside corners on unit curbs carry the most stress, and they are often where earlier patches have already been stacked.
Through-Wall Scupper
Membrane wraps into the scupper box at the parapet. Split corners and dried sealant there send water into the wall cavity.
Base Flashing At Walls
Where the roof meets a parapet, base flashing climbs the wall and tucks under counterflashing. Wrinkled or sagging base flashing pulls away from the wall.
Penetrations And Pitch Pans
Vent pipes, conduit, and gas lines pass through the membrane in boots or pitch pans that shrink and crack after a few summers.
Flat Roof Repair Options In Casa Grande
The right repair depends on how much of the roof is involved and whether the insulation below is dry.
| Repair | What It Fixes | When It Is Enough |
|---|---|---|
| Lap repair | Lifted or open seams along a sheet edge | The sheet on both sides still flexes and bonds |
| Flashing rebuild | Split corners at curbs, walls, scuppers, and drains | Leaks trace to one or two details |
| Section replacement | Wet insulation and membrane over a defined area | Core cuts show the wet area has clear edges |
| Temporary leak control | Active water through an open lap or puncture | A short stopgap until the surface dries |
What A Flat Roof Repair Fixes
Four failures cover most flat roof leaks in Casa Grande, and each repair targets the part that let go.
Open Weld Or Tape Seam
What FailsA TPO weld or EPDM tape seam lets go at its edge after years of daily expansion and contraction.
What The Repair Does
We clean, prime, and re-weld or re-tape the lap, then probe it end to end before moving on.
Leaking Drain Bowl
What FailsWater bypasses the drain through a cracked clamping ring and wets the insulation in a circle around the bowl.
What The Repair Does
Wet insulation around the bowl comes out, new board goes in, and the membrane is clamped back with fresh sealant.
Loose Base Flashing
What FailsBase flashing sags off the parapet wall, and wind-driven rain gets behind it during monsoon storms.
What The Repair Does
Flashing is re-adhered or replaced up the wall and tucked under refastened counterflashing.
Ponding Around A Patch
What FailsA patch set in a low spot sits under water after every storm and peels sooner.
What The Repair Does
The repair is extended past the ponding ring, and the drain path is cleared so standing water has a way off the roof.
Water Standing Around Your Roof Drain?
Standing water at a drain usually means a clogged strainer or a low spot in the deck. Call and tell us how long the water stays after the rain stops.
How A Flat Roof Repair Runs
Five steps, from finding the failed lap or flashing to the photos of the finished repair.
Inspect Your Roof
We identify the membrane, probe every lap near the leak, and check the drains, curbs, and wall flashing. A core cut beside the leak shows whether the insulation is still dry.
On The Roof
Clear Drains And Scuppers
Packed strainers and scupper boxes get cleared first, so standing water drains away and the surface around the repair can dry out.
On The RoofCut Out Wet Material
Any wet insulation under the leak is cut back to dry board, and the opening gets new insulation and cover board before the membrane goes back on.
On The RoofWeld, Tape, Or Flash
Laps are welded on TPO, taped on EPDM, or patched in plies on built-up roofs, and flashings are rebuilt at curbs, walls, and drains.
On The Roof
Probe And Photograph
Every new lap is probed end to end, and photos of each repaired detail come to you with notes on any area that needs watching.
Paperwork
Repairs Often Paired With Flat Roof Work
Two other services come up often once a flat roof is opened.
Industrial Roof Repair
Flat roofs on plants carry exhaust fans and process ducts, so industrial roof repair adds work zones and lockout around that equipment.
Industrial roof repair around production schedulesFlat Roof Repair Questions
What owners ask most about low-slope membrane repairs.
Where do flat commercial roofs in Casa Grande usually leak?
At the joints and edges far more than in the open field of the membrane. Daily heat swings stretch seams, drain clamping rings, scupper wraps, curb flashing, parapet coping, and pipe boots until one of them opens. Those six details are where a flat roof inspection here starts, and where most repairs end up.
Can you repair a TPO roof made by a different manufacturer?
Yes, in most cases. TPO from different makers can usually be welded together once the old sheet is cleaned and a sample weld holds. Very old or chalky TPO sometimes refuses to weld, and then a compatible tape or cover strip is used at the lap instead.
Is EPDM repaired the same way as TPO?
No. EPDM is a rubber sheet joined with primer and seam tape, while TPO is a thermoplastic joined with hot air. Each takes its own patch material, primer, and flashing, so the inspection notes which one is on the roof before repair materials are ordered.
What causes blisters on a built-up roof?
Moisture or air trapped between the plies expands in the heat and lifts the layers above it. Small blisters with no cracks can be watched. Cracked or growing blisters get cut open, dried, and patched in plies, and a core cut nearby checks whether the moisture has spread.
How long does a flat roof repair take?
It depends on how much of the roof is involved. A single lap or drain repair is a short job once materials are on the roof, while cutting out wet insulation, replacing board, and rebuilding flashing over a section takes longer. Weather, access, and tenant hours shape the schedule given after the inspection.
Can you add walkway pads while repairing?
They make sense near rooftop units. Pads along the path HVAC technicians use protect the membrane from boots and dropped tools, which are common causes of punctures around equipment. They are welded or adhered to the sheet so they stay put in monsoon wind.
Should a flat roof be coated after repairs?
Sometimes. A reflective coating over a repaired, firmly adhered membrane can slow surface aging and help keep the roof cooler. Coating goes on only after every lap and flashing is fixed and the surface is clean and dry, and the product has to be compatible with the membrane type.
Get A Free Estimate For Flat Roof Repair In Casa Grande
Tell us the membrane type if you know it and where water is showing up, and we will set up the inspection.