KEE roofing in Berkeley, CA: we confirm the exact membrane, fix wet insulation and rebuild curbs, then heat-weld compatible repairs or install new KEE.
Roof Systems | Berkeley, CA
On a lab building, the membrane has split next to an exhaust fan curb. Before anyone can repair it properly, we need to know exactly what the membrane is. KEE roofing in Berkeley, CA is a type of thermoplastic sheet, and repairs only weld well when the new material matches the old. We check any roof records, look at the sheet and earlier patches, and confirm the product before ordering. For a lab or production roof, we also plan around exhaust equipment and the rooms below. Then we decide whether the split needs a patch, a curb rebuild or more.
KEE is a thermoplastic membrane, so the quality of a repair depends on clean material and a weld that reaches sound sheet. We examine seams, patches, penetrations and backing before deciding whether a localized repair or larger replacement is justified. Berkeley’s winter rain can test a weakened lap after a dry summer, and West Berkeley’s research buildings may have dense rooftop equipment. The scope should identify the membrane condition and the prepared boundary for each permanent weld.
KEE stands for ketone ethylene ester, an additive blended into some thermoplastic membranes to improve flexibility and chemical resistance. One common example is a PVC-based sheet compounded with KEE, but not every membrane sold as KEE is made the same way. That matters because repair sheets, flashing and accessories have to be compatible with the exact product on your roof. If old patches hide the original sheet, we test-weld before committing. Once we know the product, we can tell you exactly which materials and steps the repair needs.
Many owners compare KEE with a standard PVC roof. Both are heat-welded thermoplastics, but they use different formulations and their accessories are not always interchangeable. We price both on the same roof area, with the same insulation and flashing repairs included, so the difference is real. Matching square footage does not mean matching labor, especially around curbs and walls. Whichever you choose, any wet insulation or damaged curbs we find get repaired as part of the job, not left out to make one price look lower.
A split in the membrane lets water into the insulation, and it can spread well beyond the opening. We use core cuts or a moisture scan to confirm how far it goes, and keep confirmed wet areas separate from areas that only look suspect. Wet insulation has to be removed and replaced, because new membrane on top will not dry it. Whether the roof is still properly attached is a separate check. A visual walk of the surface cannot tell you what is happening under the whole roof, so we test where it matters.
A commercial roof inspection before ordering KEE materials tells you what we could see and what still needs testing. We compare the roof with any drawings or records. Old patches can hide both wet insulation and the identity of the original sheet. If more damage turns up once the roof is open, we stop, show you, and agree on the extra area before going further, with a temporary seal over the opening. The recommendation follows what the opening and the tests actually show.
Even with the right membrane, the flashing and accessories have to match and the surfaces have to be clean. We confirm the product requirements before welding, clean or cut back old patches and dirty sheet, and make test welds to check that the materials bond. After welding, we probe the seams once they cool. Those checks tell you the weld is good; they do not tell you the insulation under it is dry, which is tested separately. A box of accessories on the roof does not mean the curb behind them is ready, so we check that too.
A TPO roof is another heat-welded option, often less expensive, with its own accessories and installation details. We price TPO against KEE over the same roof area with the same repairs, so you can compare installed roofs rather than product names. Labor around curbs and walls may differ between them. Wet insulation and damaged curbs still need fixing with either one. The membrane delivery date also does not help if an exhaust fan still has to be moved by another contractor.
New insulation raises the roof surface and can leave an exhaust curb too short for proper flashing. We measure each curb before final pricing and include any raising or rebuilding in the estimate. Our curb and penetration flashing work rebuilds the curb, then welds flashing that matches the membrane. If the fan or unit has to be moved, your mechanical contractor does that first, and we schedule around their visit. Field membrane can be installed elsewhere, but that curb is not finished until the equipment is out of the way.
Labs and production buildings often limit when and where we can work, and roof access may be tight. We ask about those limits before pricing so the estimate does not assume open access. If the roof has to be done in sections, each section needs its own setup and temporary tie-in to the old roof. Insulation, membrane, flashing and accessories all need to be on site together. A pallet of KEE sheet cannot finish a curb still waiting on the mechanical contractor, so the schedule follows everything needed to close each opening.
Old coatings, dirt and incompatible patches can interfere with new thermoplastic material. We remove what prevents a dependable weld, check the adjoining sheet and reinforce transitions only where the detail calls for it. For a KEE roof in West Berkeley, equipment clearance and service access belong in the work sequence. Oakland and Emeryville properties can have different assemblies, so the product name alone never decides which preparation is suitable.
When the job is done, you get photos of the replaced insulation, the rebuilt curbs and the finished welds, along with the test weld and seam probe results. Areas we did not open are noted as not tested. If a manufacturer warranty is offered, its terms depend on the exact membrane and how it was installed, and we explain them rather than promising coverage up front. The closeout notes record which products went where. If someone later adds equipment or cuts into the roof, they will know exactly which membrane and accessories to match.
Send any membrane records you have and tell us where the split is. We will check the sheet and the insulation underneath and send a plain repair plan with photos.
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