Find the water path around rooftop equipment
Water appearing below a rooftop unit may involve the curb flashing, an adjacent seam, the equipment itself or another roof detail. The interior stain is a useful starting point, not proof of the entry location. Share when the leak occurs, whether cooling equipment was operating, previous service visits and the rooms affected. Assessment connects those observations with accessible roof and equipment conditions before recommending a permanent correction.
A curb repair should name the defect it addresses. Examples include a separated membrane connection, deteriorated termination, damaged flashing at a corner or a problematic interface after equipment replacement. A photograph alone may not establish which condition admits water. Where the cause remains uncertain, the proposal should identify further investigation, the relevant mechanical review and the limits of any temporary protection instead of presenting every suspected defect as confirmed.
Repair the roofing detail without confusing trade responsibilities
An HVAC curb supports an equipment interface through the roof, while the flashing connects that interface to the weather surface. Roofing and mechanical responsibilities must be coordinated but remain distinct. If the equipment must be disconnected, lifted, serviced or reset, the written scope identifies the responsible trade and any access or shutdown requirements. Flashing work does not automatically include electrical, refrigerant, condensate or duct repairs.
Repair options depend on the actual roof system, curb construction and surrounding condition. Work may renew a damaged flashing component, correct a compatible termination or replace material around an assessed defect. A surface bead of sealant is not an interchangeable substitute for a specified assembly detail. TPO, PVC, EPDM and modified-bitumen roofs have different product and connection requirements, which should be checked against the applicable manufacturer information.
Evaluate repair, curb alteration and broader replacement
A localized flashing defect within a serviceable roof area may support a targeted repair. A deteriorated curb, repeated failure, insufficient interface for the proposed assembly or damage beneath the surrounding roof can require a different scope. The estimate should separate membrane repairs from curb rebuilding, replacement or equipment coordination, so the owner can compare what each option actually corrects.
Rooftop equipment changes are especially important to disclose before pricing. A replacement unit, curb adapter or roof renewal may change the footprint or the interface that must be weatherproofed. Do not assume an existing detail remains suitable merely because equipment fits above it. When design or structural questions arise, identify the responsible reviewer. This repair service does not establish a universal curb height, attachment specification or warranty entitlement.
Plan work around occupied commercial spaces
Roof access routes, equipment service clearances and the spaces below the curb affect the repair plan. Identify tenant operating hours, air intakes, sensitive inventory and the building contact authorized to coordinate access. If equipment interruption or lifting is contemplated, agree on the sequence before work is scheduled. Weather protection should be addressed as an explicit responsibility for any opening or temporarily incomplete detail.
Facility managers should also identify other planned rooftop visits. Mechanical contractors, communications installers and maintenance personnel can affect the same work area. A shared location record helps the project team coordinate around the repaired interface without assuming that every later leak has the same cause. Record agreed precautions and communicate any remaining uncertainty to the people who maintain the building.
What affects the estimate
Curb perimeter, roof system, accessibility, material preparation and the condition of adjoining insulation or support influence the scope. Equipment lifting, custom metal, mechanical isolation and concealed deterioration can add work beyond straightforward flashing renewal. A meaningful estimate identifies assumptions and exclusions rather than quoting a generic price per curb. We do not publish a universal repair price without reviewing the property and its affected detail.
For an initial request, provide the building address, roof records, equipment information and safely obtained photographs. Explain whether a repair has been attempted and whether another trade has identified a problem. Ask for a written distinction between assessment, temporary control and permanent repair. Confirm how discoveries beneath removed materials will be reported, priced and authorized before the work area is closed.
Keep the repaired curb in the maintenance record
After the agreed work, retain located photographs, the repaired detail, materials and any issued written coverage with the roof file. Those records help future equipment work account for the roof assembly instead of treating it as an unrelated surface. Maintenance opportunities include reviewing accessible flashing conditions and coordinating service routes; visit frequency and included tasks should be agreed for the actual building.
Request Commercial Roof Repair to discuss an affected curb, or Request a Commercial Roofing Estimate when equipment or roofing changes need coordinated pricing. For recurring concerns across multiple units, Discuss a Commercial Roof Maintenance Program. AmeriConstruction will use the supplied property information to discuss scope and the next step; no fixed response time, emergency availability or manufacturer qualification is implied by this service description.
Questions About This Service
Does water below an HVAC unit prove the curb is leaking?
No. Equipment, condensate and adjoining roof details can create similar symptoms. The assessment should explain the evidence for the recommended repair and whether mechanical review or further testing is needed.
Does curb flashing repair include servicing the rooftop unit?
Not automatically. The proposal distinguishes roofing from mechanical, electrical, lifting and equipment-reset responsibilities. Coordinated work can be included when the specific scope and responsible trades are agreed.
Can the existing flashing simply be sealed?
That depends on the defect, assembly and product requirements. A compatible detail repair may require preparation or replacement rather than surface sealant. Review the specified materials and the condition of adjacent roofing.
Related Roofing Services
Technical References
Use the applicable product and project documents. A resource link does not establish manufacturer certification or warranty eligibility.