Structural Roof Damage Assessment in Oklahoma City, OK.

Light-Gauge Metal Deck Assessment on Older OKC Commercial Buildings

Pre-1990 light-gauge metal deck on OKC commercial buildings is assessed by opening the membrane and insulation at representative locations — typically five to ten inspection ports on a 50,000 sq ft building — and inspecting the deck for corrosion, deflection, weld joint condition, and fastener hole condition. Deck corrosion from sustained moisture intrusion is the most common finding on OKC buildings that have had unresolved leak histories — the combination of Oklahoma's summer heat and intermittent moisture produces a corrosion environment that is more aggressive than dry climates of comparable temperature.

Hail loading on a commercial flat roof produces transient impact loads that, in aggregate across multiple hail seasons, can cause progressive deflection of light-gauge deck panels between structural members. On a building that has been through five or six documented hail seasons without membrane and insulation replacement — which is common in the OKC market for buildings whose owners managed hail damage with patch programs rather than assessed scope decisions — the cumulative deck deflection may have reached a level that affects the roof's drainage geometry. We measure deck deflection at inspection port locations and compare against original deck specification deflection limits.

Deck-to-structure connection inspection at identified failure-risk locations is a standard part of our structural roof assessment on pre-1990 OKC commercial buildings. The deck-to-structure connections on these buildings were typically specified for gravity load and for the wind uplift requirements of the era's building codes — requirements that were lower than current ASCE 7-22 standards and that predate the documented frequency of extreme OKC wind events. We probe connections at building corners and perimeter zones where uplift pressure is highest.

Tornado-Uplift Structural Assessment

Buildings that fell within confirmed tornado tracks in the 1999, 2013, or 2019 OKC-area events, or buildings whose post-event repair documentation is incomplete or unavailable, carry elevated structural assessment requirements. The post-event failure analysis from those events documented deck-to-structure connection loss as a primary failure mode on pre-1990 commercial buildings in the track areas — and that failure mode can leave deck panels nominally in place while structurally detached from the frame.

We identify buildings with confirmed tornado track proximity from the NWS Norman post-event damage surveys and note that proximity in every assessment we conduct on those buildings. Prior claim files and structural engineer reports, where the building owner can provide them, are reviewed before we scope any major work on a tornado-track building — because prior repairs may have addressed the membrane without addressing the underlying structural attachment condition.

For OKC commercial buildings where tornado-uplift structural concerns are identified in our assessment, we produce a written report that documents the observed deck condition, the connection points that require structural engineering review, and a recommended sequence for structural assessment before any new roofing system is installed. Installing a new roof on a structurally compromised deck produces a failed roof on the next wind event.

Clay-Soil Settlement Effects on OKC Structural Roof Conditions

Oklahoma County's expansive clay soils produce differential settlement in commercial buildings over time, and the settlement effects on the roof assembly are cumulative. Parapet walls that have settled relative to the roof deck put stress on the roof-to-wall flashing connection — the detail that is the primary wind-uplift resistance at the building perimeter. Drains that have settled with the surrounding structure may now be higher than the surrounding membrane, producing the chronic ponding condition that is so common on OKC commercial roofs built in clay-soil locations.

We document settlement effects in structural roof assessments by measuring parapet height variation around the building perimeter, measuring drain elevation relative to the surrounding membrane surface at all drain locations, and noting any visible evidence of building corner or perimeter wall movement that has affected the roof-to-wall attachment detail. These observations inform both the immediate repair scope and the long-term capital planning for the building's roof asset.

Buildings in the Will Rogers World Airport corridor and the commercial zones along the South Canadian River in south OKC have historically shown above-average settlement rates from both clay-soil conditions and the compressible fill that underlies some of that development area. We note building location when documenting settlement patterns in structural assessments.

Frequently asked questions

Does a structural roof damage assessment require a structural engineer?

When our assessment identifies deck-level structural concerns — corrosion, deflection, connection failures, or tornado-uplift damage indicators — yes, we recommend involving a licensed structural engineer. Our assessment covers the roof assembly: membrane, insulation, deck condition, and attachment system. Structural engineering analysis of the deck-to-structure connections and the broader building structure is the structural engineer's scope, not ours. We document our findings and note clearly which observations require structural engineering review.

How often should older OKC commercial buildings get a structural roof assessment?

Pre-1990 OKC commercial buildings on light-gauge metal deck that have been through multiple documented hail events and have not had a structural-level inspection in the prior five years are good candidates for assessment. Any building that fell within two miles of a confirmed tornado track, any building that has had recurring unexplained deflection or drainage changes, and any building approaching a major replacement decision should have a structural assessment before the replacement scope is finalized.

Is structural roof damage covered by commercial property insurance in Oklahoma?

Structural damage caused by a documented storm event — hail loading, wind uplift, tornado track — may be covered depending on your commercial property policy. Structural deterioration from deferred maintenance, clay-soil settlement, or normal aging is typically not a covered peril. We document the structural condition and note the observed cause of each condition in the assessment report. The coverage determination is between you and your insurer.

Next Step

Structural roof damage concerns on an OKC commercial building?

We assess the deck condition, attachment system, and structural indicators at the roof assembly level — and produce a written report that documents what we find and what requires structural engineering review.

Request a Structural Roof Assessment →