Commercial Roof Penetrations Dallas: HVAC, Pipes, and Flashing Details
- Landry St.patrick
- Feb 23
- 1 min read
Most commercial roof leaks originate at penetrations - the points where pipes, vents, HVAC units, and other equipment pass through the roof membrane. Proper flashing at these critical details determines whether your roof stays watertight or develops problems. JRH Construction specializes in getting penetration details right.
Common Penetration Types
Commercial roofs typically have numerous penetrations: plumbing vents, exhaust fans, HVAC curbs, electrical conduits, gas lines, and roof drains. Each requires specific flashing methods appropriate to its size, shape, and the roof membrane type. Generic approaches cause failures.
HVAC Curb Flashing
Rooftop HVAC units sit on raised curbs that must be properly integrated with the roof membrane. Metal counterflashing, membrane wraps, and termination bars create layered water barriers. When units are replaced, existing flashing often needs updating to accommodate new equipment dimensions.
Pipe Boot Selection
Pipe penetrations require boots that match both pipe diameter and roof type. Rubber boots on TPO roofs, lead boots on modified bitumen, and compatible materials throughout ensure lasting seals. JRH Construction stocks comprehensive boot inventories for any situation.
Expansion and Movement
Penetrations often move independently from surrounding roof materials due to thermal expansion. Rigid connections eventually fail. Proper flashing design accommodates movement with flexible components and stress-relief details that maintain waterproofing through temperature cycles.
Inspection and Maintenance
Penetrations should be inspected at least annually. Sealant failures, membrane separations, and flashing damage are caught early before water intrusion occurs. JRH Construction maintenance programs prioritize penetration inspection.
Contact JRH Construction for commercial roof penetration assessment. Call (469) 809-6388 or visit jrh-construction.com to address your flashing details.




Comments