Roof System
Built-Up Roof Systems
Cincinnati's 1960s through 1990s commercial construction is predominantly built-up roofing — three to five felts, mopped asphalt, aggregate surface. Most of that inventory is at or past its design life. We assess BUR condition with moisture cores and probe testing, repair systems with remaining service life, and scope full replacement when repair economics no longer hold.
Built-up roofing is the legacy system for Cincinnati commercial buildings constructed before 1995. The Hamilton County industrial corridors in Norwood, Blue Ash, Sharonville, and Evendale; the older commercial strips in Oakley, Hyde Park, and Mount Lookout; the 1970s and 1980s downtown office buildings along Vine and Fourth Streets; the industrial buildings in the Bond Hill and Roselawn zones — most of this inventory was built with three-ply or four-ply BUR over rigid or fibrous insulation.
BUR has three meaningful failure modes in the Cincinnati climate. Moisture infiltration through the aggregate surface, through aged gravel-stop flashings, or through failed felt plies produces wet insulation that reduces thermal performance, accelerates deck corrosion, and creates the conditions for catastrophic failure during ice storm loading. Blister formation in the field membrane — caused by trapped moisture volatilizing under summer heat — opens seams between plies that allow additional water entry. Flashing failure at parapets, drains, and penetrations is accelerated by Cincinnati's freeze-thaw cycling rate.
We do not advocate BUR as a new installation system for Cincinnati commercial buildings. Single-ply and modified bitumen systems outperform BUR on lifespan, manufacturer warranty availability, and installed cost in the current market. What we do on BUR is assess it honestly — determine remaining service life, identify what repair scope buys how much time, and scope the replacement when repair economics tip.
BUR Condition Assessment in Cincinnati
Visual inspection alone is unreliable on aggregate-surface BUR. The aggregate hides membrane condition, and water entry points are rarely at the leak location — water travels under the felts before surfacing at a drain or parapet. We augment visual inspection with moisture cores at 5 to 10 representative locations, core sample examination under lab conditions when the repair-versus-replace decision hinges on insulation saturation depth, and infrared scanning referrals for large roofs where a complete picture of wet insulation distribution is needed before scoping.
Probe testing at flashing laps and felt edges identifies disbonded ply edges that have not yet developed into active leaks. Disbonded plies that are probe-accessible indicate the system is delaminating from the top down — a finding that changes the recover feasibility assessment significantly. A BUR with multiple disbonded ply sections is not a good recover candidate even if the moisture cores read dry.
The structural question for Cincinnati BUR buildings is ice load capacity. Buildings constructed before 1980 in the Hamilton County commercial corridors were designed to live-load standards that predate current snow and ice accumulation guidelines. We assess roof structural framing capacity relative to Cincinnati's documented ice storm load range — 10 to 15 lb/sq ft — on any BUR building where age and construction type suggest the margin may be narrow.
Repairing Cincinnati BUR Systems with Remaining Service Life
BUR repair is cost-effective when the field membrane has sound remaining plies, the insulation is dry in the field areas, and the failure is localized to flashings, gravel stops, or isolated blister zones. In those cases, targeted flashing replacement, blister cutting and re-mopping, aggregate surface recoating, and drain cleaning extends service life 5 to 10 years at a fraction of replacement cost.
We document every repair scope against the current condition assessment so the owner knows exactly what the repair buys — and what it does not. A gravel-stop and flashing replacement on a BUR with dry field insulation buys 7 to 10 years. The same repair on a BUR where 20 percent of the field insulation is wet buys 2 to 3 years before the wet sections require tear-out. The owner deserves to know which situation they are in before authorizing repair work.
When BUR Replacement Is the Correct Cincinnati Scope
Full BUR replacement is the correct scope when: insulation moisture exceeds 25 percent of roof area; deck corrosion is present under wet insulation sections; the felt plies show generalized disbonding across the field, not just at flashings; or when the structure's ice-load capacity is marginal and a recover add significant weight. In these cases, continuing to repair adds cost without extending the asset.
BUR tear-off and replacement to single-ply TPO or SBS modified bitumen is the standard Cincinnati replacement path. The tear-off generates significant tonnage — three to five plies of felt, aggregate, and degraded insulation — that requires permitted disposal. We manage dumpster permitting, municipal disposal coordination, and recycling where available. Cincinnati's approach to commercial roofing waste disposal has tightened over the past decade; we comply with current Hamilton County waste disposal requirements and document disposal for the closeout package.
Frequently asked questions
How do I know if my Cincinnati BUR needs repair or replacement?
Moisture core testing tells you whether the insulation is wet. Probe testing tells you whether the felt plies are delaminating in the field. Visual inspection tells you the flashing and drain condition. The combination determines whether repair extends the asset or whether you are spending repair money on a system that needs replacement. We produce a written assessment with core data, probe findings, and a repair-versus-replace recommendation — not a verbal estimate.
Can Cincinnati's older BUR buildings support the weight of a recover system?
Structural capacity varies by building. Most Cincinnati BUR buildings were designed with 20 lb/sq ft live load capacity on the roof deck — adequate for a single-ply recover with insulation cover board at 4 to 6 lb/sq ft total. Buildings where we are considering modified bitumen recover — heavier than single-ply — get a structural capacity review from the building's structural engineer before we recommend the recover path.
What is the cost difference between repairing and replacing a Cincinnati BUR?
Targeted flashing and spot repair on a Cincinnati BUR with localized failures runs $1.50 to $4 per sq ft depending on flashing complexity and repair extent. Full tear-off replacement to single-ply TPO runs $10 to $16 per sq ft on the same building. The right comparison is not repair cost versus replacement cost in year one — it is repair cost in year one plus projected repair cost in years two through five versus replacement cost amortized over a 20-year warranty period.
Do you do BUR repairs in winter in Cincinnati?
Hot-mopped BUR repair requires above-40°F substrate temperature for proper adhesion. Cold-applied patching compounds work at lower temperatures but are appropriate for temporary repairs only — not permanent structural ply replacement. We do hot-applied BUR repair in Cincinnati from April through October and schedule cold-process temporary repairs through winter with permanent repair follow-up in spring.
Have a BUR building approaching the repair-versus-replace decision point?
We walk the roof with moisture core equipment and probe testing tools and produce a written condition assessment — repair scope and cost, replacement scope and cost, and a clear recommendation based on what the data shows.
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