There’s a brown stain spreading across the ceiling of the sunroom, or the garage has a drip that only shows up in a hard, wind-driven rain. Someone patched it with a can of roof cement two summers ago, and now it’s back. You need flat roof repair in Shawnee, KS that finds the actual opening and closes it for good.
It’s frustrating to fix the same leak twice, and it’s hard to know whether the next roofer will patch it properly or push you toward a whole new roof. You should be able to see what’s wrong and decide for yourself.
APC Roofing repairs flat and low-slope roofs on Shawnee homes and small buildings. We’re GAF Certified, licensed and insured, and your inspection is free. Call 913-398-5020 to have the roof checked.
Why flat roof leaks show up far from the hole
Water that gets through a flat roof membrane doesn’t always fall straight down. It spreads into the insulation or runs along the deck until it finds a seam in the plywood, a nail or the low point of a ceiling. A stain in the middle of the room can start at the wall where the porch roof meets the house.
That’s the main reason quick patches fail. If the patch goes on above the stain and the real opening is ten feet away, the leak keeps going.
Where flat roofs on houses usually leak
On porches, garages and additions around Shawnee, most leaks come from one of these spots.
The tie-in to the house
Where a low roof meets the wall or the steeper main roof, the membrane has to run up and tuck under the siding or shingles above it. If it was laid on top instead, or the flashing was skipped and sealant used in its place, water runs straight into the joint. A stain in the corner nearest the house often points here.
Seams
Single-ply membranes come in rolls, so there are seams. TPO seams are heat-welded. EPDM seams are bonded with primer and tape, and older EPDM seams tend to lift at the ends first. A seam that opens even a little lets water travel under the sheet.
Flashing around vents and pipes
Every opening in a flat roof needs its own flashing. Cracked pipe boots and dried-out sealant around vents are common on older low roofs.
Edges after a windstorm
Wind pulls up hardest along the edges and corners of a low roof. Loose edge metal lets air under the membrane, and a small lift can turn into a peeled section.
Low spots that hold water
Water that sits for days ages the membrane faster, and in winter it freezes and works on any nearby seam. Ponding usually comes from a sagging deck, a clogged gutter or drain, or a roof that was built without enough slope.
Punctures and hail
A dropped tool, a falling branch or a hailstone can puncture a membrane. These holes are often tiny and only turn up on a slow, close look.
How the leak gets found
A good flat roof repair starts with a slow walk of the whole roof, not just the area above the stain. Seams get probed by hand, flashings and edges get checked, and the drainage gets looked at with a level eye for low spots.
When the source isn’t obvious, a controlled water test on one section at a time can narrow it down. If the leak has been running for a while, a moisture meter or a small test cut shows whether the insulation below is wet and how far the water has spread.
What the repair looks like
The fix has to match the membrane.
On TPO, the area is cleaned and a new piece is heat-welded over the damage, then the weld is checked. On EPDM, the surface is cleaned and primed and a cover patch is bonded with seam tape, with rounded corners so they don’t peel. Modified bitumen and built-up roofs get patched with compatible materials.
Flashing repairs mean new flashing, not another layer of sealant over the old one. At the tie-in, that can mean opening the siding or the bottom course of shingles so the membrane can be lapped correctly.
Wet insulation gets cut out and replaced before the membrane is closed back up. Sealing a new patch over wet insulation traps the water in, and the deck keeps rotting underneath.
When flat roof repair isn’t enough
Repairs make sense when the problem is in one place and the rest of the membrane is sound. If seams are failing all over, the membrane has gone brittle, or a large part of the insulation is soaked, a new roof will cost less over time than repeated patches. Our flat roof installation in Shawnee page covers what that involves, and our flat roofing in Shawnee page compares the membrane options. If your building is commercial, see commercial roof repair in Shawnee.
Storm damage and insurance
If hail or wind damaged the roof, you file the claim with your insurance company and pay your own deductible. We document the damage with photos, give you a written estimate and work with your adjuster. Be wary of anyone who offers to waive or cover your deductible.
How it works
- Book your free inspection. Call 913-398-5020 or request a free estimate online. Let us know where the stain or drip shows up inside.
- Get a clear, honest assessment and estimate. You’ll see photos of the leak source and any wet insulation, and hear whether a repair will hold.
- The repair gets done and the site gets cleaned up. Old material and scraps leave with the crew.
A small flat roof leak doesn’t stay small for long. Water held in the insulation can soften the deck over a single wet season, and a patch can turn into a section of new plywood.
Flat roof repair questions
Can I just put roof cement on it?
It may slow a leak for a while, but roof cement doesn’t bond well to single-ply membranes like TPO and EPDM, and it often makes a proper repair harder later.
Is a blister on my flat roof a problem?
A small, firm blister may not leak right away. Blisters that are soft, growing or split open usually mean moisture or a loss of adhesion underneath and should be checked.
Can a flat roof be repaired in winter?
Often, yes. TPO can be welded in cool weather, while EPDM adhesives need a dry surface and cure more slowly in the cold. If a permanent repair has to wait, a temporary one can keep water out until conditions improve.
How do I know if my flat roof is beyond repair?
Repeated leaks in new places, seams failing across the roof and wet insulation over a large area are the usual signs. An inspection with photos will show you which you’re dealing with.
Get the leak stopped for good
Call 913-398-5020 or book your free inspection online. You’ll know exactly where the water was getting in and that it’s been fixed properly, and you can stop checking the ceiling every time it rains.
