Built-Up Roofing (BUR) in Springfield, MO
What a BUR Tear-Off Bid Doesn't Tell You About Ply Count
Built-up roofing - tar and gravel, multiple layers of asphalt-saturated felt - is the oldest system still working on buildings around Springfield, and some of the hospital and university campus roofs we inspect are original BUR sections patched for decades.
How Many Plies Are Actually Up There
A built-up roof's design life is tied directly to how many felt plies were installed - three, four, or occasionally five - and a tear-off bid that quotes a flat disposal rate without confirming actual ply count is guessing at both the tonnage of debris and the labor hours to remove it. On an older roof that has been recovered once already, the true ply count can be double what the original design called for.
We core-sample a BUR roof before quoting a tear-off, pulling a small section down to the deck at a few points, so the disposal tonnage and labor estimate reflect what is actually there rather than an assumption based on the building's age.
Gravel Surfacing Hides Problems Until They're Serious
The gravel or slag surfacing on a BUR roof protects the asphalt underneath from UV exposure, but it also hides blistering, alligatoring, and membrane splits from a routine visual inspection. Hail events can drive gravel into the membrane surface hard enough to cause damage that is not visible until the gravel is pulled back at a suspect area.
We rake back gravel at multiple sample points during an inspection rather than relying on a surface walk, particularly after a significant regional hail event.
Flashing at Parapets Is Where BUR Roofs Actually Fail
The flat field of a built-up roof is rarely where leaks start - it is almost always at parapet walls, roof-to-wall transitions, and penetrations where the multi-ply felt system is hardest to detail correctly. Decades of patch work at these transitions often leaves layered repairs that trap moisture rather than shedding it.
When we find a flashing detail that has been patched repeatedly without solving the underlying problem, we address the transition properly rather than adding another patch on top of the last one.
Before quoting a BUR tear-off or recover, here is what we actually check on site:
- Core sample at two or more points to confirm true ply count
- Gravel rake-back at suspect areas to check for hidden hail or blister damage
- Moisture scan of insulation below the membrane
- Flashing condition at every parapet and roof-to-wall transition
- Deck condition at accessible points, especially near known leak history
- Code-compliant layer count if a recover rather than tear-off is being considered
Tear-Off Versus Recover on an Old BUR Roof
Whether an old BUR roof can be recovered with a new single-ply membrane or needs full tear-off comes down to moisture content in the insulation below and how many layers the building can carry under current code. A moisture scan showing widespread wet insulation usually settles the question in favor of tear-off, since a recover over saturated insulation just seals the moisture in and accelerates deck damage that will need addressing later anyway.
On buildings where the deck is structurally sound and moisture readings come back dry, a recover can be the more cost-effective path, and we will recommend it when the numbers support it rather than defaulting to the larger tear-off scope.
What a Complete BUR Tear-Off Bid Should Include
A complete bid states confirmed ply count from an actual core sample, disposal tonnage priced by weight rather than a flat allowance, and a specific plan for parapet and penetration flashing rather than a generic line item.
It should also state what happens if the deck underneath is found to be damaged once tear-off starts, since older BUR roofs frequently reveal deck issues that were not visible from above.
Questions We Get About Built-Up Roofing
Is it worth repairing an old BUR roof or should we replace it?
It depends on ply condition and how localized the damage is. Isolated blistering or a failed flashing detail is worth repairing; widespread membrane splits across the field usually mean the roof is past the point where patching makes financial sense.
Why does gravel surfacing matter for hail damage?
It hides impact damage from view, so a roof can look fine from a walk-by inspection while carrying real membrane damage underneath the stone. We rake back gravel at sample points after any significant hail event to check.
Can a BUR roof be recovered with TPO or another single-ply membrane?
Sometimes, if the existing roof passes a moisture scan and the building's layer count under code allows it. Old BUR roofs that have already been recovered once often cannot take another layer without a full tear-off first.
How long does a BUR tear-off take on an occupied building?
Longer than a single-ply tear-off of the same size, because multi-ply felt removal is slower and generates more debris to manage, especially once a core sample confirms extra layers from a prior recover. We phase the work and protect interior spaces at penetrations throughout.
What causes most BUR roof leaks in this area?
Failed flashing at parapets and penetrations, not the flat field itself. Decades of freeze-thaw cycling and ice storm loading work on those transition details faster than they work on the membrane's open field, which is why we inspect flashing first on any older BUR roof before spending time evaluating the field membrane.