TEXAS COMMERCIAL BUILT-UP ROOFING
Built-Up Roofing (BUR) in Texas: The Time-Tested Tar-and-Gravel System
Long before single-ply membranes arrived, the built-up roof was keeping water off flat Texas buildings — and on the right project it still does the job as well as anything. Texas Pro Roofer installs, repairs, and re-roofs BUR tar-and-gravel systems on low-slope commercial buildings across the state.
The Original Flat Roof
What Built-Up Roofing Is
A built-up roof is exactly what the name says: it is built up on the deck in alternating layers. Crews mop hot bitumen — asphalt or coal tar — between plies of reinforcing roofing felt, one layer over the next, until several plies are bonded into a thick, continuous slab of waterproofing. Then the whole assembly is topped, most often with a flood coat of bitumen and a layer of gravel. That is where the old nickname “tar and gravel” comes from, and it has been protecting flat roofs for well over a century.
The strength of BUR is in its layers. With multiple plies of felt and bitumen stacked together, there is no single skin standing between the building and the sky — water has to get through every layer before it reaches the deck. For a big, flat Texas roof that a building owner wants to simply forget about for years, that redundant construction is a genuine comfort.
Why the Gravel Matters
The Gravel Layer Is Doing Real Work
That surface of gravel is not decoration. In the Texas sun, ultraviolet light is what breaks asphalt down over time, and the stone flood coat takes that punishment so the bitumen underneath does not. The gravel also shields the plies from hail and foot traffic, adds fire resistance, and holds the flood coat in place. On a roof baking under summer heat all day, a well-embedded gravel surface meaningfully extends how long the whole system lasts.
The trade-off is weight and a surface that is harder to inspect and repair than a smooth membrane — loose stone has to be raked back to find and fix a problem. It is one of the honest reasons BUR fits some buildings better than others, and we will lay that out plainly before you commit.
Where It Still Wins
The Right Building for a Built-Up Roof
BUR earns its place on large, truly flat roofs where durability and layered redundancy lead the priorities — and where the structure can carry the extra weight of felts, bitumen, and gravel. Its thick, monolithic surface handles rooftop foot traffic well, which suits buildings whose roofs see regular equipment service.
It is not the lightest or the most reflective option, so on many modern projects owners weigh it against single-ply. We help you make that call based on your deck, your budget, and how you use the building — not on what we would rather sell.
Honest Comparison
BUR Alongside the Modern Systems
Built-up roofing is proven, but it is no longer the only proven answer for a flat Texas roof. A reflective TPO membrane installs lighter and bounces the sun for cool-roof savings the dark surface of a classic BUR cannot match. A modified bitumen system carries much of BUR’s multi-ply toughness in a more modern, easier-to-install package. And if an existing built-up roof is aging but structurally sound, a restorative roof coating can add reflective, watertight years without a full tear-off.
The right choice comes down to your building, and we would rather help you get it right than push one system on every roof. Compare the full range on our commercial roofing page, and whichever way you go, a routine maintenance plan is what turns a good roof into a long one.
Questions, Answered
Built-Up Roofing FAQ
How long does a built-up roof last?
A quality BUR system commonly serves 15 to 30 years depending on the number of plies, the surfacing, and maintenance. The gravel flood coat shielding the asphalt from UV is a big part of why a well-built tar-and-gravel roof can reach the upper end of that range in Texas.
Is tar-and-gravel roofing outdated?
Not outdated — just no longer the only good option. BUR remains a durable, redundant choice for large flat roofs. Single-ply and modified bitumen have simply given owners lighter, more reflective alternatives, so the best pick now depends on the building.
Why is my built-up roof harder to repair?
The gravel surface has to be raked away to reach the plies, locate the fault, and patch it, then re-surfaced. It is more involved than patching a smooth membrane, which is one honest trade-off of the system — but a leak in a well-built BUR is usually localized and fixable.
Can you repair my existing BUR roof instead of replacing it?
Frequently, yes. If the plies are largely intact and the problem is confined to flashings or a section, a repair may be all you need. If the roof is broadly worn, we will price a re-roof straight. Call (866) 625-1977 for a free inspection.
FREE, NO-OBLIGATION ESTIMATE
Ready to Sort Out Your Flat Roof?
We will inspect your built-up roof, weigh repair against re-roof honestly, and hand you a written estimate.