Owner's Representative Services for Commercial Roof Projects

Site observation, submittal review, RFI management, and closeout verification for Phoenix commercial roof replacement - someone accountable to the building owner, on site during production, who is not the contractor.

A commercial roof replacement in Phoenix is a capital project that typically runs $400,000 to $2,000,000 depending on building size and system specification. Most building owners have no one on site during production who is accountable to them rather than to the contractor. The project manager the contractor sends is responsible to the contractor. The manufacturer's warranty representative shows up for the final inspection, not during production. The building owner finds out about problems at the end - or not until a monsoon season reveals what was under the membrane.

We serve as owner's representative on Phoenix commercial roof replacement projects that we did not install. Our role is site observation, documentation, and communication - not contractor management in the adversarial sense, but accountable representation of the owner's interests during a project that happens on top of a building the owner will rely on for the next 20 years.

Phoenix's climate creates specific owner-rep pressure points that are different from other markets. TPO heat-welding cutoff times during the June-September summer window are a production quality issue that requires someone on site in the morning to verify compliance - a seam welded past the noon cutoff in July does not look different from a properly welded seam, but it will fail within two monsoon seasons. Drain installation during replacement - the single most consequential detail for Phoenix ponding performance - is a one-hour window during tear-off and re-install that nobody documents unless someone is watching.

What Owner-Rep Site Observation Covers

Daily production observation during active installation: We are on site at the start of production, during material installation, and at dry-in. We document the following each production day: start time, crew size, materials staged (with manufacturer lot numbers for membrane and adhesive), TPO weld start and stop times (with ambient and substrate temperature readings at start, midday if applicable, and stop), seam test documentation (5-lb test wheel, probe tool), daily dry-in status and temporary waterproofing status at end of production, and any non-conformance observations.

Phoenix heat-welding compliance: During June through September, we record ambient temperature and substrate temperature at the start of weld operations and at the end of the weld day. Any weld activity attempted above the manufacturer's published substrate temperature threshold (typically 130°F substrate) is documented as a non-conformance and reported to the contractor and the building owner in writing the same day. We also document the crew's heat-illness prevention protocol - OSHA requires a heat-illness prevention program for outdoor workers when the heat index reaches 80°F, which Phoenix exceeds every day from May through September.

Drain installation observation: During tear-off and re-installation, we observe and photograph the drain body condition, the deck substrate at each drain opening, and the new drain installation detail before the membrane tie-in is completed. This is the single most important construction observation point for Phoenix buildings - inadequate drain slope, improper membrane tie-in at the drain flange, and incorrect drain body sizing are the root cause of most first-monsoon-season ponding failures on newly installed Phoenix roofs.

Submittals, RFIs, and Schedule Oversight

Submittal review: Before installation begins, we review the contractor's material submittals against the contract scope. Membrane submittals should include manufacturer product data sheets confirming system, thickness, and solar reflectance value meeting the AECC requirement. Insulation submittals should confirm R-value and ISO density. Adhesive and primer submittals should confirm compatibility with the specified membrane system and that the adhesive is rated for Phoenix substrate temperatures. Any submittal that does not match the specified product triggers a written deficiency notice to the contractor.

RFI management: When field conditions reveal a scope question - a drain location that differs from plan, an equipment curb that was not in the pre-bid assessment, a deck condition that requires a different insulation detail - we manage the written RFI process. The RFI documents the field condition, the contractor's proposed resolution, and the owner's approval or modification. Every field change is in writing before work proceeds. Verbal field change approvals are the source of most post-project disputes.

Schedule oversight: We track the contractor's production schedule against the Phoenix climate calendar. Any schedule change that pushes membrane installation or TPO welding into the June-September heat window or the July-September monsoon window requires owner notification and, depending on the project type, a written weather contingency plan from the contractor. Occupied buildings - hospitals, data centers, semiconductor fabs - require additional schedule oversight to ensure dry-in is completed before any exposure risk to occupied space.

Closeout Verification

The closeout package on a Phoenix commercial roof replacement should include: the manufacturer warranty document (NDL or as contracted); the roof zone diagram with all closeout photos keyed to zone; the ASTM E1918 solar reflectance test report; the manufacturer start-up documentation; the maintenance contract; and the City of Phoenix permit final (where applicable). We verify that each item in the contractually required closeout package is present and complete before recommending final payment release.

Manufacturer warranty inspection: We accompany the manufacturer's field representative during the NDL warranty inspection and document any items the representative requires the contractor to address before the warranty is issued. Warranty inspection failure items are written up and tracked to completion. The warranty document does not get filed until the manufacturer confirms all items are resolved. On Phoenix projects, the most common warranty inspection failure items are inadequate seam width at parapet base flashings and insufficient membrane tie-in at penetration boots.

Frequently asked questions

Do you provide owner-rep services on projects where you also wrote the procurement scope?

Yes. It is common for us to handle both - procurement scope and bid coordination before award, then owner-rep site observation during construction. The continuity is an advantage: the site observer already knows what the scope requires and what the contract says, rather than coming in cold at the start of construction.

How often are you on site during a Phoenix roof replacement?

Daily during active production. Phoenix's summer heat schedule - 4 AM to noon during June-September - means production starts before most building engineers arrive. We are on site at start of production, not just for periodic check-ins. For projects in the October-June window, we observe the full production day or the first and last production hours depending on project complexity and contract requirement.

What happens when you observe a non-conformance during production?

We document it in writing the same day - photo, written description, date, time, the contract requirement it violates - and deliver the non-conformance notice to the contractor's project manager and the building owner simultaneously. The contractor has the opportunity to respond with a corrective action plan. If the non-conformance involves a completed weld or an installed detail that cannot be corrected without removing work, we document that clearly and the owner makes the decision on how to proceed.

Can you serve as owner's rep on an emergency roof repair project in Phoenix during monsoon season?

Yes, though the observation cadence is different for emergency repair than for a planned replacement project. Emergency repair observation focuses on the dry-in sequence, the temporary waterproofing method and materials, and the final repair documentation - rather than daily production scheduling. We provide a written post-repair report documenting what was done, what materials were used, and whether the repair meets the warranty maintenance requirement.