A blister on a Smithfield commercial roof is a raised bubble where the membrane, or a layer inside the roof, has separated. Some blisters are harmless for years. Others mean trapped moisture or a failed bond that will eventually split open and leak. Cutting a blister open or coating over it without knowing the cause can leave the real problem in place.
We inspect blistered roofs in Smithfield and nearby, then explain the repair options in plain terms. The inspection sorts out whether you have a surface problem in one spot or wet, damaged layers that need deeper repair. What we find decides which repair fits your roof and which parts of it can stay. You get the reason for our recommendation, with photos.
Every Smithfield building gets its own inspection. Tell us the address, where the blisters are and when any leaks showed up inside. Old repair records help if they describe the roof that's actually there now. We look at the roof before assuming what caused a blister, and if we can't tell what's under it from the surface, we say so and recommend a way to check. Photos show how the blister relates to the membrane around it and how far the repair would extend, and the recommendation notes anything else to check before the permanent repair goes on.
What's under the blister?
A blister can be a separation between layers of a built-up or modified bitumen roof, or a pocket under a single-ply membrane. Looking at it alone won't tell you which layers are involved or whether there's water inside. We inspect the membrane around the blister and note any other blisters or damage nearby.
We figure out whether the blister affects the surface the repair needs to bond to. If we cut it open, we protect the area while it's exposed. We identify the roof type so the repair matches what's there, and the repair area follows what we find, not every bump on the roof.
A commercial roof inspection sorts these questions out. Buildings in Suffolk get their own inspection the same way. Membrane that looks fine may still need a closer look before we count on it staying. On the other hand, a few blisters don't mean the whole roof has failed. We explain what supports a small repair and what points to a wider investigation, and we're clear about what we can't confirm without opening the roof. Photos show the blisters we checked and how far the repair would go.
Checking for trapped moisture
Water trapped inside the roof can damage the insulation around a blister. We check for moisture using methods that suit the roof type. A moisture scan can point us to areas worth checking when conditions are right. Rooftop equipment, the roof build-up and what we can see all affect how we read the results. A pattern on a scan doesn't tell us exactly how much to remove until we confirm with cores.
Confirmed wet or damaged insulation is listed separately from areas we're still unsure about. The new membrane needs a dry, solid base underneath.
Our infrared moisture survey can help on larger blistered areas, within its limits. A job in Franklin gets its own decision about whether a scan will work. If infrared won't give useful results on your roof, we use core cuts or probes instead. Confirmed insulation removal is described along with how it ties into the dry insulation that stays. If we find more damage after opening up, we photograph it and explain the extra repair before going further. A new membrane doesn't fix wet insulation just by covering it.
Getting a good bond around the repair
The repair needs sound membrane around it to bond to. We identify the membrane and any old coatings or patches before choosing how to seal it. Dirty, weathered or coated surfaces may need more prep than a quick cleaning. The seaming method follows the actual membrane and repair detail.
On older roofs, we sometimes do a small test bond first to see how the surface takes the new material. That result applies to the spot and method we tested. A bigger patch shouldn't be used just to hide blisters.
Our commercial roof repair crews check the edge where new membrane meets the old roof. If we replace insulation, the roof height at the repair may change slightly where it meets the existing roof, so we plan for that before choosing replacement layers. The repair needs enough clean surface around it for the seam to hold. If old roof cement or coating is in the way, we include removing it. You'll see why the prep extends past the obvious blister, and the repair area is based on what we find and the method that fits.
When coating makes sense and when it doesn't
Coating the roof is worth considering only after we know what's causing the blisters. A coating won't replace missing insulation or fix damaged layers under a blister. We look at the rest of the roof before deciding whether coating makes sense. Old coatings and bond requirements are checked on the surface that would be coated, and the new system needs the right prep and weather for application.
Failed details get their own repair before any coating goes on. Those repairs stay separate from a coating meant to extend the life of a roof that's otherwise sound.
Our roof coating restoration option depends on what we find. Test patches tell us about the area we tested, not the whole roof, so wider areas may still need checking. We explain where a local repair will solve the problem and where wider work makes sense. If the weather isn't right for the coating, we wait. The recommendation ties prep work to the surface that will receive the coating, so you can compare options by the repairs they include, not just how they'll look.
Opening blisters above occupied rooms
Opening a blister exposes the roof over the space it normally protects. The operator tells us which areas are sensitive and how we can move materials before we start cutting. We plan a work area we can close the same day, with a temporary seal that matches the roof. Replacement insulation and membrane are on site before we open anything.
Interior damage like wet ceiling tile or electrical issues is handled by the right trades. We coordinate with them on roof status, but our work doesn't replace their assessment. You'll know which temporary protection is still in place until the permanent repair is done.
Our occupied building reroofing crews follow this approach above occupied space. On office building roofs, the operator sets the access rules. When we're done, our record shows the repaired area and the membrane left around it. Later service visits should avoid the new repair and report any new damage quickly. If water shows up again, we inspect the roof as it is then rather than assuming it's the same problem. Overnight and holiday leaks can be reported with the location and photos, and we confirm a response time once we've reviewed the conditions and access.
Commercial Roofing Questions
Does a blister mean the Smithfield roof has one specific problem?
No. Blisters have several possible causes. We inspect the layers and the roof around it, because the surface alone can't tell us what's inside.
How do you decide if insulation under a blister needs replacing?
We check with methods that suit the roof and confirm with cores. Confirmed wet areas are separated from areas we're still checking.
How far does a repair extend around a blister?
Far enough to reach clean, sound membrane for a good seal. Surface prep and insulation height affect how big that is.
Can a coating fix damage under a blister?
No. A coating can't fix wet or damaged insulation. Those repairs come first, then we decide whether coating the rest makes sense.
How do you protect the rooms below when a blister is opened?
We have materials on site, open only what we can close that day, and coordinate with interior trades where needed.
Blisters on a Smithfield roof?
Send us the Smithfield address and photos of the blisters or any leaks inside. We'll check what's causing them and explain the repair with photos.