Replace the Roof — With the Right Evidence First

The first question in any commercial roof replacement project is not which membrane to use — it is whether the existing assembly must come off entirely or whether a recover system is code-permissible and technically sound. Getting this wrong in either direction is expensive. Recovering over wet insulation creates a warranty-voiding, energy-wasting time bomb. Specifying tear-off when recover was viable wastes disposal costs and landfill fees.

Most jurisdictions following IBC — including Amarillo and surrounding Panhandle municipalities — cap roofing assemblies at two total layers. If your building already has two roofing layers from prior repairs or an earlier recover, tear-off is required before any new system goes on. That is not a contractor preference; it is a code requirement that affects the permit and the warranty.

The second variable is insulation moisture content. An infrared survey conducted after a rain event — when thermal differential between wet and dry areas is greatest — gives a non-destructive read on the extent of saturation. We follow every survey with physical core cuts in flagged zones to confirm depth and condition. If more than roughly 25% of the insulation surface is saturated, recovering over it is not a sound investment: wet insulation loses R-value, harbors microbial growth, and provides poor adhesion for the new membrane. Full tear-off becomes the economically correct choice even when it was not technically mandatory.

The third variable is deck condition. Corroded steel deck flanges, deteriorated wood decking, or spalled concrete substrate must be addressed before any new system is installed. A replacement membrane bonded to a compromised deck may look correct on the day of installation and fail within years. We document deck findings in writing with photographs before any membrane work begins, and we do not proceed until the deck substrate is confirmed sound.

Commercial roof replacement in the Texas Panhandle is not simply swapping one membrane for another. The replacement event is the opportunity to correct every deficiency in the prior assembly — inadequate insulation R-value, undersized edge metal, missing cover board, and outdated fastener patterns that no longer meet current wind uplift requirements. A replacement spec that carries forward those same deficiencies is a missed opportunity and, in some cases, a code violation.

A properly written replacement specification for an Amarillo commercial building addresses insulation assembly first. Current energy codes require meaningful R-values; the standard two-layer staggered-joint polyiso installation achieves this while also eliminating thermal bridging at insulation joints that was common in single-layer assemblies. A high-density cover board — typically half-inch 100 psi polyiso or gypsum board — sits above the primary insulation to protect it from hail impact and provide the firm, continuous substrate required for fully adhered membrane application.

Edge metal is a frequent failure point in Panhandle storms. ANSI/SPRI ES-1 governs the wind uplift performance of perimeter edge metal, copings, and fascia — and that standard is required by IBC. A replacement that installs a new membrane over aged, undersized edge metal has not solved the most common Panhandle storm-failure mechanism. Every replacement we perform specifies new ES-1 tested edge metal matched to the building's wind exposure category.

Penetration flashings at HVAC curbs, pipes, and conduits account for a disproportionate share of leak callbacks on new installations. We specify and install membrane-compatible flashings at every penetration — not generic uncured EPDM or contractor-grade tape over incompatible substrates. If equipment curbs need raising to provide adequate flash height, that scope is identified before membrane work begins.

The membrane selection — TPO, EPDM, or PVC — is discussed in detail in our commercial roofing systems guide. For replacement specifically, the primary considerations are: building use (chemical or grease exposure argues for PVC), wind and hail exposure (fully adhered 80-mil TPO or PVC for maximum uplift and impact ratings), and the existing warranty situation.

The pre-construction sequence matters as much as the installation itself. Before any bid is finalized, we conduct the infrared survey, perform core cuts, and deliver a written assessment that identifies layer count, insulation condition, deck substrate findings, and drain layout. That document drives the spec — not a generic scope pulled from a prior job file.

Tear-off is staged in sections sized to expose only what can be re-covered in a single day. Panhandle weather requires this discipline — an exposed deck left open overnight is a water intrusion risk regardless of the forecast. We use temporary water barriers on any section not yet under new membrane by end of day. Tear-off debris is contained and hauled per municipal disposal requirements.

New insulation goes down in two layers with joints staggered in both directions — a code-required practice that eliminates the thermal bridging that single-layer installations create at every board joint. The cover board follows. Membrane installation proceeds according to the manufacturer's approved installation guide, and seam welds (for TPO or PVC) are tested with a probe after they cool. Every seam is documented in a written installation log.

At completion, the project file you receive includes: the executed Mule-Hide warranty document, the pre-construction infrared and core-cut report, as-built flashing details for every penetration, deck condition photos taken during tear-off, and the FM assembly specification. That documentation package follows the building — it is relevant to any future insurance claim, warranty claim, or sale of the property. Learn more about our ongoing maintenance programs that keep a new roof under warranty from day one. For new construction projects, see our new construction roofing coordination approach. Government and institutional buildings can review our SDVOSB contracting capabilities.