Built-up roofing assessment, recovery, and replacement for Tulsa legacy commercial buildings — Brookside, Cherry Street, the Rose District in Broken Arrow, and the pre-1980 commercial stock across the metro.
Built-up roofing is the original Tulsa commercial flat roof — the Brookside storefronts, the Cherry Street district, the pre-1970 warehouse stock, and the downtown masonry buildings carry BUR systems that are now 40 to 70 years old. We assess what is there, tell you what it has left, and scope the recover or replacement that the building actually needs.
Built-up roofing (BUR) — alternating layers of reinforcing felt and hot-mopped asphalt with a gravel or mineral-surfaced cap — is the foundation of Tulsa's pre-1980 commercial roof inventory. The Brookside commercial district, Cherry Street and the 15th Street retail corridor, the older masonry buildings in the Brady Arts District, and the pre-energy-boom warehouse stock throughout the metro all carry BUR systems. So does a significant share of Broken Arrow's Rose District and Sand Springs' original commercial block.
The oldest BUR systems in the Tulsa metro are approaching 60 to 70 years old. That is far past the documented service life of any built-up system — typically 20 to 25 years for a well-maintained installation — but Tulsa's dry-to-moderate Climate Zone 3A conditions and the quality of original construction on some pre-1960 buildings mean that well-maintained BUR sometimes outlives its theoretical life significantly. The critical variables are whether the substrate layers are still bonded, whether the gravel surfacing is still in place and uniform, and whether moisture has entered the assembly.
We do not install new built-up roofing systems — hot-mopped BUR requires equipment and specialized labor that we do not maintain because the market for new BUR on commercial buildings is negligible. What we do is assess existing BUR honestly, determine whether a modified bitumen or single-ply recover is feasible, and scope the replacement when the system's condition makes recover inappropriate.
The condition variables that determine whether a Tulsa BUR is a recover or replacement candidate: adhesion between felt plies (probe-tested at the field and at flashings), gravel cover uniformity and thickness, drain condition and elevation, parapet flashing bond, and moisture in the insulation assembly as measured by core pulls. A BUR that has lost ply adhesion across more than a quarter of the field, or that has saturated insulation in more than 25% of core locations, is a replacement candidate — recovering over delaminated or wet BUR produces a warranty that most manufacturers will not write and that will fail prematurely.
Parapet conditions on older Tulsa masonry buildings are often the deciding factor. Pre- districts carry original built-up base and cap flashings that have been repaired many times and are frequently open at the termination. If the parapet masonry is sound and the flashing termination can be re-established, the BUR recover scope is viable. If the parapet is deteriorating or the masonry is spalling — which we find frequently on 1920s–40s commercial buildings in these corridors — the parapet condition drives the scope as much as the membrane condition.
A modified bitumen or TPO single-ply recover over existing BUR is viable when: the existing felt plies are bonded and the BUR is structurally sound, the insulation assembly is dry on core pulls, the deck below the BUR is in sound condition, and the new assembly's weight is within the structural capacity of the building. Gravel-surfaced BUR typically requires a cover board over the gravel before the new membrane goes down — the cover board provides a smooth bonding surface and adds the hail-resistance component the Tulsa market requires.
Recover over BUR is not viable when: the existing plies are delaminated, the insulation is wet in more than 25% of core locations, the deck has sustained moisture damage, or the building's structural loading is already at or near capacity. Tulsa's pre-1940 commercial construction in the Brookside and downtown districts sometimes has wood-joist or unreinforced masonry decks where additional assembly weight is not structurally permissible — we verify structural capacity before recommending any recover scope on these buildings.
Full BUR replacement on a Tulsa legacy commercial building involves tear-off of all existing felt plies, insulation, and any existing recover layers down to the structural deck. On Brookside and Cherry Street buildings, that deck is often original wood plank or lightweight concrete over steel joists — we document deck condition thoroughly before specifying the new assembly and address deck repairs before the new insulation and membrane go down.
The replacement specification for most Tulsa legacy commercial buildings replacing BUR is a single-ply TPO or PVC system over new polyiso insulation with HD cover board — it is lighter than a new BUR system, provides the FM 4470 Class 1 hail-resistance path that the insurance market requires, and carries a 20-year NDL manufacturer warranty. For historic structures in the Brady Arts District or Cherry Street where building officials require specific material compatibility, we work with the applicable review authority on the specification before finalizing the project scope.
We will not know until we inspect it. A 70-year-old BUR system requires a full field assessment: probe testing for ply adhesion, moisture cores at five to ten locations, parapet flashing evaluation, drain elevation check, and a deck condition assessment at inspection ports. Some original Tulsa BUR from that era is still performing adequately; most at that age is not. We produce a written condition report with a specific recover-vs-replace recommendation and the reasoning behind it before any contract conversation.
No. Hot-mopped BUR requires specialized equipment and crew certification that we do not maintain because demand for new BUR on commercial buildings is minimal — the market has moved to modified bitumen and single-ply systems that provide comparable or better performance with more contractor availability, better manufacturer warranty paths, and faster installation. We assess and recover or replace existing BUR but do not install new built-up systems.
Gravel ballast provides meaningful impact protection against smaller hail — 1-inch stones or less — but does not protect the membrane plies against the 1.75-inch to 2.5-inch events documented in Tulsa County. Post-hail inspection of gravel-surfaced BUR assesses whether the gravel layer was displaced, whether any membrane breach occurred beneath the gravel, and whether drains were blocked by displaced stone. We run these assessments after documented Tulsa County severe-weather events for buildings on our maintenance programs.
Our project managers assess the system thoroughly — probe testing, moisture cores, parapet evaluation, deck inspection — and produce a written condition report with a specific recover or replacement recommendation.
Tell us about the building and the roof problem. We'll document it and put a plan in writing — no pressure, no boilerplate.
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