A puncture in a commercial roof membrane is often small: a dropped screwdriver, a sharp piece of HVAC debris, a heel through a soft spot, or a branch after a winter storm. The hole may be the size of a fingertip, and the temptation is to slap a patch on it and move on. The trouble is what you cannot see. Water that got through the hole may have soaked the insulation around it, sometimes well past the patch area, and wet insulation under a dry-looking membrane keeps rotting the deck and losing insulating value long after the hole is closed.
When we repair a puncture, we locate it, check the membrane around it and test the insulation underneath before deciding how big the repair needs to be. If the layers below are wet or crushed, we price that as its own item so you can see it separately from the patch. On roofs near Ventura Harbor, we also look at nearby exposed metal and fasteners, because salt air speeds up corrosion. For an office building roof, we start with that building and its property manager, then work out the right repair for what we actually find.
Locating the puncture and what caused it
We start where the leak was reported and look at the roof around it. First we identify the membrane: TPO, PVC, EPDM, modified bitumen or something else, and if you have the original roof records, we check them against what is installed. If HVAC work happened recently or there is a well-worn path across the roof to a unit, that can explain the damage, though it is not proof on its own. Older photos help only if we know when and where they were taken. A ceiling stain points us in a direction, but water can run along the deck before dripping, so the hole on the roof is not always right above the stain.
If the puncture does not fully explain the leak, our leak repair work keeps looking. A failed seam or flashing nearby may be letting in water too, and patching the hole will not stop that. We report each source on its own so nothing gets missed.
Choosing the right patch for the membrane
Every membrane has its own repair method. TPO and PVC are usually patched by hot-air welding a new piece of the same material. EPDM uses primer and seam tape or a cured patch. Modified bitumen gets a torched or cold-applied patch with matching granules. The membrane manufacturer's instructions spell out how far the patch must extend, how the surface is cleaned and what primer or adhesive to use. If the membrane around the hole is brittle, shrunk or too dirty to bond, we cut out that section and replace it rather than patch over it. If we are not sure what membrane is on the roof, we find out before ordering material, since the wrong patch simply will not stick.
A seam failure found near the puncture is a separate repair. Patching the hole does nothing for an open seam a few feet away, so we price and fix it on its own.
Checking what is under the puncture
The hole on top tells you very little about what is underneath. Water may have spread through the insulation, or foot traffic may have crushed the cover board, and neither shows from above. We take a core cut or use a moisture meter near the puncture to find out. What we find at that spot is what we report; we do not assume the whole roof is wet because one area is, or that it is dry because one core came up clean. If we open the area and the damage is bigger than expected, we stop, measure it and get your approval with photos before doing the extra work. The roof is sealed temporarily in the meantime.
Replacing wet insulation and cover board under the repair can change the roof height slightly. Near a curb or drain, that matters, so we check the finished height before ordering, and the new membrane goes down over a sound, dry surface.
Related Roofing Work
Office Building Roofing
Commercial Roof Leak Repair
Seam Failure Repair
Roof Insulation and Cover Board
Access and working near equipment
A simple patch can usually happen on the same visit as the inspection. If we need to cut out wet insulation or bring up rolls of membrane, we plan that with your building contact: where we load, which areas need to stay clear, and what time of day works for the tenants below. Punctures near rooftop units are common. If the unit has to be shut down or moved so we can reach the damaged area, your mechanical contractor handles that, and we schedule our work around them instead of leaving an open roof waiting for them to show up.
For a building near downtown Ventura, we sort out parking for the truck, roof access and any work-hour limits with the property contact before the crew arrives, so the repair can be finished in one trip.
What the repair record shows
Once the patch or replacement section is in, we give you a short record: where the puncture was, photos of what was under the membrane before it was covered, the material we used and how far the repair extends. If we put in a temporary patch first, the record says so and notes when the permanent repair was done. If a new leak appears later, whoever looks at it can check whether it is near our repair or somewhere else. The record shows what we fixed; it does not certify the rest of the roof.
If we see a flashing failure at a nearby wall or curb, we list it as a separate repair. A field patch does nothing for flashing that has pulled loose, so that detail gets its own inspection and price.
Each repair is marked on a roof plan or tied to a nearby landmark, like a specific rooftop unit or drain. A close-up photo of a patch is hard to find again on a large roof without.
For any puncture, we record the location, the approximate size, the condition of the membrane around it and any damage to insulation or deck we can confirm. A small hole can sit over a bigger wet area, so we do not set the patch size from the surface mark alone. The membrane is cleaned and prepared the way its manufacturer requires, and we note the finished overlap. If movement, ponding or another penetration helped cause the damage, we point it out before closing up the roof. That way your maintenance team knows what was repaired and what to keep an eye on.
Common Questions
Does the size of the hole tell you how big the repair is?
No. The patch has to extend past the hole into clean, sound membrane, and the insulation underneath may be wet over a wider area. We check both before setting the repair size, so the price reflects what actually needs fixing.
What if nobody knows what membrane is on the roof?
We identify it before buying material. TPO, PVC, EPDM and modified bitumen each need their own patch material and method, and a patch that looks right but is not compatible will not bond. Old roof records help, and we confirm them on the roof.
What if the insulation under the puncture is wet?
We measure how far the wet area goes, show you photos and give you a price for replacing it before we proceed. The roof is temporarily sealed while you decide. We only replace what we find wet, not the whole area on a guess.
What should I keep after the puncture is repaired?
Keep the record we give you: the location, photos of what was underneath, the material used and the repair size. If another leak shows up later, it lets the next contractor see whether it is near our repair or something new.
Get a roof puncture repaired
Send us the building address, where the damage is and any roof records you have. We will inspect the puncture, check the insulation underneath and give you a price for a proper repair.