Commercial Roof Work
Humidity & Trapped-Moisture Roof Repair in Fort Lauderdale, FL with scope notes, photos, and next steps.
A leak you can trace to a torn flashing is the easy kind of wet roof. The kind that costs owners twice is the one with no hole in it at all, where the water came from inside the building, rode up into the roof assembly on the heat and humidity, and condensed in the insulation where nothing on the surface ever shows it getting in. Patch the membrane over that and you have fixed nothing, because the moisture is still being generated from below and the new work will blister and ridge exactly the way the old work did. We chase the cause, not the bubble.
Few commercial roofing environments in the country are tougher on a roof assembly than ours. The buildings that pay for it are all over Fort Lauderdale: cold-storage and food operations near Port Everglades, busy kitchens along the Las Olas and downtown restaurant rows, laundries and process plants out in the Cypress Creek and State Road 84 flex corridors, and any tightly conditioned space running hard air conditioning against soupy outdoor air. The mechanism is relentless and it runs one direction here. Warm, moisture-laden interior air carries vapor, and that vapor pressure drives it upward through the roof toward the cooler outside. When it reaches a surface inside the assembly that is below the dew point, it condenses into liquid water, and unlike a rain leak it has no entry point to find and seal. It just collects, season after humid season, until the insulation is saturated and the steel deck underneath begins corroding from the top side down where no one can see it.
The signs are specific once you have learned to read them. Blistering is the classic one: vapor pressure builds beneath a single-ply membrane and lifts it off the substrate in bubbles that grow and multiply over time. Ridging shows up as long raised welts tracking the insulation board joints, where trapped moisture has wicked into the seams and the board has expanded. Underfoot the field feels spongy and soft wherever the insulation has soaked through and surrendered its compressive strength. And the tapered insulation that was installed to push water toward the drains slumps and crushes under the moisture load, so the designed slope flattens, ponding spreads, and the standing water traps still more heat and still more moisture in a loop that feeds itself. By the time any of this is visible from above, the saturated area is almost always much larger than it looks.
This is the part most repair crews never check. In a hot, humid climate, the dominant vapor drive runs from the conditioned interior upward and out, which means the vapor retarder belongs low in the assembly, beneath the insulation, where it can stop interior moisture before it ever reaches the cold zone where it would condense. A surprising number of roofs we open up have the retarder in the wrong layer, torn, or missing entirely. When that is the case the assembly is fighting the building physics instead of working with them, and it functions as a moisture trap by design. It is also exactly why recovering over a failed roof without correcting the vapor layer guarantees the same damage reappears inside the new system within a few years. We are not interested in selling you that job twice.
You cannot repair what you have not mapped, so we start with an infrared moisture survey. After sundown, when the roof releases the day's stored heat, the saturated insulation stays warmer than the dry insulation around it and reads as discrete hot zones on the thermal image. We confirm those zones with small core cuts that let us see the actual insulation condition, the state of the deck below it, and crucially whether a vapor retarder exists and where it sits in the stack. On any sizeable Fort Lauderdale roof that has not had a documented moisture survey in the last three years, we recommend running one as the first step of any assessment. Wet insulation caught early is a contained repair. Wet insulation caught after it has corroded through the deck is a tear-off, and the difference between those two outcomes is usually a matter of timing.