Most leaks on a maintenance hangar start where the roof changes direction: the low roof over the shop bays meets the high hangar wall, a membrane roof butts into metal panels, or a curb interrupts the field. Water gets behind the flashing at those joints and can travel a long way before it drips onto a work stand or a parts cage. On a walk-through in the Ventura area, we start at the leak inside, find the transition above it and trace the membrane until we reach material that is still sound. That tells us how much has to come off before a repair will last.
Port Hueneme and Point Mugu are both part of Naval Base Ventura County, and hangar and shop buildings in this part of the county share the same salt air and coastal fog. Before we schedule a visit, we need to know which building it is, who will escort us and any drawings or past repair records the facility has. Those records shorten the inspection. They also let the shop supervisor decide which bays can be cleared on the day we open the roof.
Repairing the roof transitions
A transition repair only holds if the new flashing bonds to good material on both sides. During flashing failure repair we cut back to membrane that is clean, flexible and dry. A PVC or TPO roof can be heat-welded once the old surface is cleaned properly. Modified bitumen and built-up roofs need their own primers and torch or cold-applied plies. Where the old membrane is brittle or soaked, we remove it rather than patching over it.
Both ends of the repair need a clean stop. We carry the new flashing past the damage to a seam or termination bar that can be sealed. That way the repair has a finished edge instead of a loose lap that opens up the next winter.
Protecting the bays below
Opening a hangar roof can put dust, debris or a sudden rain shower over aircraft, tooling and open maintenance work. Before any tear-off we walk the floor with the facility's point of contact. We mark which bays sit under the work area, where debris will come down and how materials will reach the roof. Our occupied-building reroofing method means a hangar roof is never left open overnight, and openings stay small. If a bay has to stay in service, we schedule around it.
The facility sets the escort and badge rules, and the shop decides when aircraft or equipment move. We give them a clear picture of the open area and how long it will stay open. An inspection cut that uncovers rot or rust gets reviewed with the shop before it grows.
Curbs, vents and rooftop equipment
Many hangar leaks trace back to exhaust fans, makeup-air units and vent stacks rather than the open roof. Our rooftop curb and support work checks curb height, wood nailers, counterflashing and the condition of the membrane around each unit. If a unit has to be lifted or disconnected, the mechanical contractor handles that part. Structural changes to supports go to an engineer. On older hangars we also look for rusted curb flanges and abandoned vents that were capped with mastic and never properly closed.
We split the estimate so it is clear which part is roofing and which part depends on another trade. That keeps a curb from being flashed in while the unit on top still needs to be reset, and nobody is surprised by a second mobilization.
Related Roofing Work
Flashing Failure Repair
Occupied Building Reroofing
Rooftop Equipment Curbs and Supports
Infrared Moisture Survey
Checking for wet insulation
A hangar roof can look fine from the top while the insulation underneath holds water from an old leak. An infrared moisture survey picks up the warm spots that wet insulation gives off after sundown. We confirm suspect areas with core cuts before deciding what to keep. A scan points to problem areas, but only the cores tell us how deep the damage goes. That difference often decides between a local repair and a larger section replacement.
If the wet area is large, a section reroof may make more sense than patching. A thicker roof can affect curb heights, drain sumps and door headers, so we check those before recommending it. Our military installation roofing work follows the base's access, scheduling and paperwork rules for that kind of larger project.
Closeout and what comes next
At the end of the job the facility gets photos of each repaired transition, the inspection openings we patched and the areas where we used temporary protection. Any item still waiting on a mechanical or structural decision is listed separately. That way nobody mistakes a temporary patch for a finished repair when the next leak shows up. We also list drains, edges and seams that are wearing but not yet leaking.
Hangars near Oxnard and the coast deal with salt air that corrodes fasteners and metal edges faster than inland roofs. We note that wear on the closeout so it can go into the maintenance plan. For related buildings, see our pages on aircraft hangar roofing and military warehouse and depot roofing.
Maintenance hangars pair big roof areas with large aircraft doors, overhead utilities and controlled work zones. Before we mobilize, we confirm equipment clearances, crane or lift paths, door operation and escort rules with the base. Penetrations and support points are checked against the actual drawings, and any structural or mechanical change goes to the right engineer first. Our roof plan shows the approved repair areas without exposing restricted facility details. If a bay cannot be released, we leave it out of the schedule and price it separately. That gives the crew a schedule that protects the roof and the work happening under it.
Common Questions
How do you decide how much roof to remove at a leaking transition?
We cut back until we reach membrane and insulation that are dry, flexible and well attached. The repair is then sealed to that sound material at a seam or termination bar, so it does not end on damaged roofing that will fail again.
What happens in the bays below if the opening gets bigger?
Nothing gets cut wider until the shop supervisor and the base contact have seen it. Together we decide whether aircraft or equipment need to move, where extra protection goes and how debris will come down. The new opening is dried in the same day.
Who handles the rooftop units when a curb has to be reflashed?
The mechanical contractor disconnects, lifts and resets the equipment, and an engineer reviews any change to the supports. We handle the curb, nailers, flashing and membrane, and our estimate lists those items separately.
How will we know which areas are only temporarily patched?
The closeout photos and notes mark each temporary repair, the reason it is temporary and what still needs to happen there. Finished repairs are labeled separately so the next inspector can tell them apart.
Schedule a hangar roof inspection
Tell us which building, where the leaks show up and who will escort our crew. We will inspect the transitions and curbs and give you an estimate that spells out the roofing work, the other trades involved and how the bays below will be protected.