Commercial Roof Leaks: Why Rooftop Equipment Is the Real Problem (And How to Stop It)
Commercial roofs rarely fail “in the middle of the field.” Most leaks start at details—the places where the roof is interrupted by equipment, pipes, drains, or edges.
In 2026, that’s a bigger issue than ever because buildings are adding and upgrading rooftop systems: HVAC retrofits, electrical conduit, internet equipment, solar, and more. Every add-on creates a new penetration—and a new leak opportunity if it’s not detailed correctly.
Below is the practical guide property managers use to reduce leaks and protect roof life.
1) The Big Five leak zones on commercial roofs
Here’s where we see the most recurring problems:
- HVAC curbs and transitions
- Conduit/pipe penetrations (especially “after the fact” installs)
- Pitch pockets / penetration pockets that shrink or split over time
- Drains, scuppers, and overflow drains
- Parapet walls, coping metal, and terminations
Many of these are addressed in best-practice guidelines from National Roofing Contractors Association, which emphasizes proper detailing and maintenance at roof edges, penetrations, and flashings.
2) HVAC curbs: the “movement” problem
HVAC units vibrate. Curbs expand/contract. Service techs walk around them. That movement stresses flashing over time.
What good curb detailing includes:
- Compatible membrane flashing materials
- Correct termination height and securement
- Protection where foot traffic happens most
Common failure signs:
- Cracked sealant lines
- Loose termination bars
- Splits at corners
3) Pitch pockets: convenient, but maintenance-sensitive
Pitch pockets (also called penetration pockets) are sometimes used when penetrations are irregular or hard to flash with prefabricated parts. Industry guidance notes they’re often treated as a “last alternative,” and their sealant fill requires ongoing maintenance.
If your roof has pitch pockets, don’t ignore them—they’re not “set it and forget it.”
For some systems, manufacturers offer purpose-built pitch pocket accessories designed to seal difficult penetrations (instead of improvised field builds).
4) Drains and scuppers: small clogs, big consequences
Drainage issues don’t just cause ponding—they can force water into seams and terminations.
Minimum owner checklist:
- Keep strainers clear
- Confirm water flows after a hose test
- Watch for staining that indicates “dirty ponding”
If you manage multiple properties, document drain conditions during each inspection so patterns are obvious.
5) “Other trades” are a top cause of roof damage
A perfectly installed roof can be compromised by later work—HVAC service, electrical additions, security cameras, satellite/internet upgrades.
One classic industry rule: no new penetrations without the roofing contractor involved—because the roof’s waterproofing system is specialized. Older NRCA guidance also warns against allowing uncoordinated equipment installations and uncontrolled roof traffic.
6) Best-practice policy: require a roof penetration protocol
If you’re a property manager, write this into vendor rules:
- Any penetration must be reviewed by roofing
- Use manufacturer-compatible flashing materials
- No “mastic-only” fixes
- Photo documentation before/after
For single-ply systems, manufacturers like Johns Manville publish flashing installation guidance intended to integrate penetrations correctly into TPO/PVC/EPDM assemblies.
7) A simple commercial maintenance cadence that works
Twice per year (plus after major wind/rain events):
- Walk the perimeter and terminations
- Inspect all penetrations and curbs
- Clear drains/scuppers
- Check roof-top-traffic area
This approach reduces surprise leaks and helps you budget planned repairs instead of emergency calls.
If your building has recurring leaks around HVAC units, penetrations, or drains, Rocket Roofing can inspect the details, document problem zones with photos, and recommend durable repairs that align with your roof system.
Real customers, Real reviews
Real customers, Real reviews
Rocket Roofing is professional and honest. Super happy with their service.
Alan and his company was very clean professional in doing the work. Out of 4 other companies, Rocket Roofing gave me a better price for the same work.
They did the work well and communicated ok
Roof repair for storm & wind damage. Professionalism, Punctuality, Quality, Responsiveness, Value
These guys are the absolute very best. They are very talented, smart they took their time explaining the process and followed through absolutely amazing. I tell you I e spent 22 years in the Marines these guys are top shelves
Excellent job. I would definitely recommend Rocket roofing. We really appreciate your work. Thank you
Rocket Roofing came through again for me on one of my investment properties in LA, not only did they do the job well, they were honest in letting me know my sky lights did not need replacement and saved me even more money! Highly recommend!
Great service, great employees and great experience overall. I have been working with Alan for over 2 years now. He and his team inspected the property I bought and made some repairs on the roof as well. They also offered a warranty work that I purchased (5 years warranty).After 2 years of wind and rain in San Diego, I started getting some leaks and sign of leakage couple of months ago, so I called Allen.
He sent the first available person after the rain was done and repaired the spot. I noticed the leak again after the next rain so I called him again. This time he send 2 people and replaced the entire section free of charge under the warranty work.
They also screwed in a tiny section of my gutter that was loose.
Overall I am very grateful to know Rocket Roofing and I will definitely contact him to replace a new roof when the time is arrived.
Alan and the guys at Rocket Roofing were absolutely amazing! They were responsive and very professional! They didn’t waste time and made sure that everything was complete and no additional damage was done. I would recommend them to anyone who needs any work done!
Great company to work with. Alan was very professional when inspecting my property, and his team did great job fixing my roof. Highly recommended.
This is the second time I have used Rocket Roofing and I am very happy with their work. They were extremely fast, friendly, professional and most importantly very affordable. I would highly recommend them to anyone in need of roofing repairs, especially for storm and wind damage. They are a top-notch company that truly cares about their clients and their work. I will definitely be using them again in the future!
I recently had a new roof installed by Rocket Roofing. The installation was done very professionally and on time. They were extremely responsive to all of my questions, even after we got started and the job was about 75% done, we had a few questions for them. They came back out to check everything a few days later and made sure it was right before moving on to the next phase of work. I received several quotes on our house before deciding on Rocket Roofing, they were by far less expensive than anyone else. Our home is much safer now that the roof has been replaced and I highly recommend them!
My roof was looking pretty bad after the last big storm we had. I called up Rocket Roofing to see if they could give me an estimate. They came out the next morning and gave me a very reasonable estimate. I was able to get the work done that afternoon so that my roof would not be damaged any further by another storm. The technicians were very friendly and professional, and cleaned up after themselves. My roof looks great! Thank you so much for all your help.
I recently had a new roof put on my home and I am so pleased with the quality, professionalism, and communication.Rocket Roofing came in to assess what needed to be done, let us know what he was going to charge and how long everything would take. He was right on time and completed the job exactly as he said he would. We will definitely use them again in the future!
Alan was phenomenal to work with. Always answered my call(s); if he wasn’t able, he returned my call promptly. He went out of his way to match the tiles of my Client’s home which we both were very appreciative of. Alan is a true professional.
I was extremely satisfied with my experience working with Rocket Roofing. The work quality was excellent, and the crew was extremely friendly and courteous. I would highly recommend them to anyone looking for roof installation or in need of repair work. My thanks to all at Rocket Roofing for a job well done!
Rocket Roofing did a great job on my roof. They were responsive to all my questions and took care of all the insurance red tape. The price was very reasonable and they did a great job cleaning up after themselves. I would highly recommend them.
Rocket Roofing is a trustworthy company that did a terrific job replacing our roof. We were very pleased with their timeliness, professionalism and overall knowledge of the roofing business.
Owens Corning Roofing Products
Owens Corning Roofing Products
Rocket Roofing is proud to be selected as an Owen’s Corning Approved Roofing Contractor.
Owens Corning is a leader in roofing shingles, underlayment and components products. The look of a roof can have a significant impact on the overall design and perceived value of a home. After all, the roof can make up half of a home’s exterior.
Owens Corning systems look better, last longer and offer more choices to perfectly fit your project.
Rocket Roofing is proud to be selected as an Owen’s Corning Approved Roofing Contractor.
Owens Corning is a leader in roofing shingles, underlayment and components products. The look of a roof can have a significant impact on the overall design and perceived value of a home. After all, the roof can make up half of a home’s exterior.
Owens Corning systems look better, last longer and offer more choices to perfectly fit your project.
