Skylight and Roof Penetration Sealing in Fairfield, CA
The details leak, not the field. Curbs, skylights, pipe penetrations and equipment supports, flashed properly rather than sealed with mastic.
If you need skylight and roof penetration sealing in Fairfield, you are addressing the part of the roof where the overwhelming majority of commercial leaks actually begin. The open field of a membrane is a simple, continuous, machine-welded surface. Every curb, skylight, pipe, conduit, drain, exhaust fan and equipment support is a hand-built assembly with corners, transitions and movement, and that is where water gets in.
The most common bad repair in commercial roofing is a bead of sealant run around a failing penetration. Sealant is a component of a flashing detail, not a substitute for one. It has a service life measured in a few years under California UV exposure, and when it fails the water has been getting in for some time before anyone notices.
What is included in skylight and penetration sealing
Skylight curb reflashing
New membrane flashing up the curb with proper termination, rather than sealant applied over a failed detail.
Skylight unit replacement
Cracked, crazed, hazed or leaking units replaced. Older acrylic domes become brittle under sustained UV exposure and eventually crack.
Pipe and conduit penetrations
Pre-formed boots or field-fabricated flashings with proper clamping, replacing degraded boots and failed sealant collars.
HVAC and equipment curb flashing
Curbs reflashed with membrane and termination bar, plus correction of curbs set too low to flash properly.
Equipment support correction
Rooftop equipment sitting directly on membrane, or on improvised blocks, relocated onto proper supports.
Cricket installation
Where a wide curb dams water on its upslope side, a cricket diverts flow around it instead of letting it pond.
Signs your building needs this
- Interior staining directly beneath a skylight, curb or rooftop unit
- Cracked, crazed, yellowed or hazed skylight domes
- Sealant beads around penetrations that have cracked, shrunk or pulled away
- Pipe boots split at the top of the collar
- Rooftop equipment sitting directly on the membrane or on timber blocks
- Ponding on the upslope side of a wide curb or screen wall
- New rooftop equipment installed by another trade with penetrations they flashed themselves
Our skylight and penetration process
Penetration inventory
We catalogue every penetration on the roof and record its condition against a roof plan.
Prioritisation
Failed and actively leaking details first, degraded but sound details scheduled, and sound details noted for monitoring.
Proper flashing
Detail rebuilt with compatible membrane, termination bar and clamping, not sealed over.
Drainage correction
Crickets added where curbs dam water, so the new detail is not sitting in a pond.
Documentation
Photo record before and after for your maintenance file and warranty compliance.
Your options compared
| Detail | How it fails | Correct repair |
|---|---|---|
| Skylight curb | Flashing pulls away, sealant cracks, water enters at the corners | Reflash the curb in compatible membrane with a termination bar |
| Skylight dome | Acrylic crazes and cracks under sustained UV | Replace the unit, reflash the curb while it is open |
| Pipe penetration | Boot splits at the collar, sealant degrades | New pre-formed boot or field-fabricated flashing with clamp |
| HVAC curb | Flashing short, membrane pulled loose at corners | Reflash with membrane carried up the curb to a proper termination |
| Equipment on membrane | Unit set directly on the roof abrades and punctures it | Relocate onto proper supports or a sleeper system with pads |
| Wide curb damming water | Ponding on the upslope side | Cricket installed to divert water around the obstruction |
Common penetration failures and the correct repair. Cost and service life figures are published industry ranges, not quotes for your building.
What skylight and penetration sealing costs in Fairfield
Penetration work is priced per detail, because each one is its own small assembly. That is actually useful for budgeting: a roof with 40 penetrations can be addressed in prioritised phases across budget cycles rather than as a single capital event, with the actively failing details done now and the degraded ones scheduled.
What drives the cost per detail:
- Detail type. A pipe boot is quick. A large skylight curb reflash is a half day.
- Membrane compatibility. Matching an aged or discontinued membrane may require a transition detail.
- Curb height. Curbs set too low to flash properly need building up, which is carpentry as well as roofing.
- Skylight unit replacement. The unit itself is a material cost on top of the flashing labour.
- Cricket work. Tapered insulation to divert water around a curb adds material and labour.
- Access over occupied space. Skylight work is by definition directly above the interior, so protection is required below.
Local conditions that change this job in Fairfield
Skylights are unusually common on Fairfield's warehouse and distribution stock, because daylighting a large floor plate is far cheaper than lighting it, and the county's building inventory has expanded steadily with logistics construction along the Cordelia Road and Highway 12 corridors. That gives many local buildings dozens of skylight curbs each, and every one is a penetration. The local ageing factor is UV. Fairfield's essentially cloudless May to October stretch delivers sustained high UV exposure year after year, and acrylic skylight domes respond to that by crazing, yellowing and eventually cracking. On buildings with original domes from the 1990s or early 2000s, dome replacement across the roof is frequently the single highest-value penetration project available.
Why Fairfield building owners choose us for this work
Details first
Leaks start at penetrations, not in the field
Across commercial roofing, the overwhelming majority of leaks originate at curbs, skylights, pipes, drains and perimeter details rather than in the open field of the membrane. This is why a leak investigation that concentrates on the field of the roof usually finds nothing, and why our penetration inventories catalogue every detail on the roof against a plan rather than looking only where the water showed up inside.
Not sealant
A bead of caulk is not a flashing detail
The most common inadequate repair in commercial roofing is running sealant around a failed penetration. Sealant has a service life of a few years under California UV and is a component within a flashing assembly, never a replacement for one. We rebuild the detail in compatible membrane with proper termination and clamping, which is more work and lasts an order of magnitude longer.
Per detail
Phased budgeting across cycles instead of one capital event
Because penetration work is priced per detail, a roof with dozens of them does not have to be addressed all at once. We prioritise into what is actively failing, what is degraded and should be scheduled, and what is sound and needs monitoring, so the work can be spread across budget cycles without leaving an active leak unattended.
Skylight & Roof Penetration Sealing across Fairfield and nearby Solano County cities
We cover Fairfield directly from this page. For the surrounding cities, each has its own page covering the building stock, wind exposure and drainage conditions that change how this work is done there.
Other services Fairfield building owners ask about
See all commercial roofing services or read about how we work and get in touch.
Fairfield Superior Commercial Roofing provides skylight and penetration sealing across Fairfield, Solano County and the surrounding North Bay. Licensed and insured, open 24 hours a day.
Skylight & Roof Penetration Sealing questions we get asked in Fairfield
Why does the area under our skylight keep leaking after repairs?
Almost always because the repair was sealant applied over a failed flashing rather than a rebuilt flashing detail. Sealant degrades under UV within a few years and the leak returns.
The other common cause is that the curb itself is too low to flash properly, in which case the curb has to be built up before any flashing will hold.
Should we replace our skylight domes or just reseal them?
If the acrylic is crazed, yellowed or cracked, replace it. UV degradation is not reversible, and a crazed dome will keep failing regardless of what is done to the flashing around it.
Replacing the unit is also the right moment to reflash the curb properly, since the detail is open anyway.
Another contractor installed rooftop equipment. Who flashes the penetrations?
This is one of the most common sources of commercial roof leaks and warranty disputes. HVAC, refrigeration, solar and telecoms contractors frequently make their own penetrations and flash them to their own standard.
If your roof is under a manufacturer warranty, unauthorised penetrations can void it. The right sequence is for the roofing contractor to flash any new penetration, and we are happy to coordinate directly with the other trade.
Can you add a skylight to an existing commercial roof?
Yes, though it involves structural work as well as roofing, since a new curb needs framing into the deck. It is worth doing where daylighting a large floor plate will reduce lighting load.
We coordinate the framing and the roofing so there is no gap in responsibility between the two, which is where new-opening leaks usually originate.
How often should penetrations be inspected?
At every scheduled maintenance visit, so twice a year as a baseline. Penetrations are the highest risk elements on the roof and they degrade gradually rather than suddenly.
It is also worth an inspection any time another trade has been on the roof, because unauthorised penetrations and abrasion from equipment are common and rarely reported.
Get a written scope for your skylight and penetration project
Free assessment, photographs and a scope you can actually compare against another bid. Serving Fairfield and all of Solano County.