Roof Recover Systems in Oklahoma City, OK.

Moisture Core Sampling Protocol

We pull moisture cores at a density of one core per 4,000-5,000 sq ft on roofs being evaluated for recover — with a minimum of six cores on any roof we assess regardless of total area. Core locations sample every roof zone: field areas, areas near drains, zones adjacent to reported leak points, and any locations with visible surface anomalies such as blisters, membrane ridging, or prior patch repairs. On a 60,000 sq ft single-story OKC industrial building, that means 12-15 core pulls during the inspection visit.

Each core cut is inspected visually — wet insulation shifts from white to yellow or brown — weighed before and after oven-drying to quantify moisture content, and photographed in place before the plug is replaced and sealed. Core locations are plotted on the roof zone diagram and each location's finding is documented in the written report. The report shows the core map, the finding at every location, and the percentage of cores reading wet.

Our threshold: if more than 25% of core locations show wet insulation, recover is not the honest scope. Wet insulation under a new membrane will not dry out — it continues to deteriorate, supports biological growth that degrades membrane adhesion, and will void the manufacturer's warranty at the first warranty inspection. Below 25% wet cores, targeted insulation replacement at wet locations combined with a recover membrane can produce a warranted system with full expected service life.

Oklahoma-specific condition: the red clay soils underlying Oklahoma County create seasonal building movement as the clay heaves in wet weather and shrinks in drought. This movement cycles fastener patterns and seam terminations open over time, creating accumulating moisture infiltration paths that are not always obvious on surface inspection. Buildings along the NW 39th Street corridor and the south OKC industrial areas sitting on expansive clay soils show this pattern more consistently than buildings on engineered fill in newer development areas.

Recover System Design

A recover system has three components: the attachment method to the existing roof assembly, the new insulation overlay, and the new membrane. Each is specified based on the existing roof's condition and the membrane manufacturer's published recover system design requirements.

Attachment: most recover systems on Oklahoma City commercial buildings are mechanically attached — screws and plates driven through the new insulation, the existing membrane, the existing insulation, and into the structural deck. The fastener pattern is wind-uplift designed to the same ASCE 7-22 requirements as a new system. For buildings in open-terrain exposure categories — common on the west OKC industrial corridor and the south Oklahoma County warehouse districts — perimeter and corner fastener density is substantially higher than the field specification. On existing roofs with significant membrane degradation, we may specify a cover board over the existing membrane to provide a uniform substrate before the new insulation layer.

Insulation overlay: typically a minimum 1-inch polyiso cover board or thicker rigid polyiso depending on the energy code compliance requirement. If the existing insulation contributes meaningfully to the R-value calculation and is dry, the overlay thickness needed to We calculate the existing-plus-new R-value and identify the minimum overlay to achieve compliance, then specify an HD cover board in the insulation stack to qualify for hail-resistance ratings — a standard specification on every Oklahoma commercial roofing project.

Membrane: TPO, EPDM, or modified bitumen selected and specified the same way as a new replacement system. The recover membrane carries the same 15-20 year manufacturer warranty as a new installation if the substrate passes the manufacturer's recover system requirements. We specify the membrane based on building use, the owner's capital horizon, and the wind-uplift and hail-resistance performance required in OKC's tornado-alley environment.

When Recover Makes — and Does Not Make — Sense

Recover makes sense when: insulation is dry at more than 75% of core locations, the deck is sound under every core pull, the existing membrane has no active open seams or field delamination, and the building falls within the single-recover rule — no prior recover layer has already been installed. On an Oklahoma City building meeting all four conditions, a recover system at $8-11 per square foot installed versus $13-16 per square foot for full replacement delivers 40-50% capital savings with equivalent warranty protection and service life.

Recover does not make sense when: wet core percentage exceeds 25%, the building already has a prior recover layer installed and code requires tear-off, the deck shows structural deterioration, or the existing membrane is too degraded to provide a uniform substrate for the recover system attachment.

One pattern we watch closely in the OKC commercial inventory: buildings where a coating or recover was done 10-15 years ago that may have trapped marginal moisture at the time. We have inspected buildings in the Classen Boulevard and NW 23rd Street corridors where a mid-2000s recover went over borderline-wet insulation, and the insulation has continued deteriorating under the recover membrane ever since. Core sampling on these roofs sometimes shows dramatically worse insulation condition than the surface appearance suggests — which is precisely why physical core pulls, not surface observation, drive the recover decision.

Frequently asked questions

How much does a recover system cost versus full replacement in Oklahoma City?

A recover system on a qualifying Oklahoma City commercial flat roof typically runs $8-11 per square foot installed, compared to $13-16 per square foot for full tear-off replacement on the same building. The savings come from eliminating tear-off and disposal cost and from reusing the dry existing insulation rather than replacing it from deck up. Those savings are only real when the recover scope is genuinely honest — a recover over wet insulation fails its warranty and effectively costs full replacement within a few years.

How do you patch the core holes after inspection?

We replace each core plug in the hole and seal it with compatible peel-and-stick flashing tape — the same material used for on-membrane repairs. The repair is watertight and leaves no permanent damage to the membrane. We photograph each patched core as part of the inspection documentation package.

Can a building that already has one recover layer get another recover?

No. Oklahoma building code following IBC limits commercial flat roofs to one recover layer over the original roof system. If a prior recover layer is present, the next scope is a full tear-off to deck. We identify prior recover layers during core investigation — the core shows two membrane layers clearly — and include that finding in the written report.

Next Step

Recover or replace — need a clear answer for your OKC building?

We will pull moisture cores, document the results, and deliver a written recover-vs-replace recommendation with system options and installed cost estimates for both paths.

Request a Recover Assessment →