Tar and Gravel BUR (Built-Up-Roof) Restoration
One of the popular roofing systems in Texas has been to lay ply sheets of asphaltic paper over various types of insulation using hot tar or cold-pitch tar and ballast the system with gravel.
As tar and gravel roofs start to breakdown, customers face a decision: re-roof or restore? After a thorough roof evaluation, CES Commercial Roofing can usually recommend restoration rather than replacement. The solution is a closed-cell polyurethane foam, followed by high-solid (96%) silicone elastomeric for additional waterproofing and UV protection.
Spray polyurethane foam provides superior waterproofing and insulation benefits. In addition, foam can be tapered to provide positive drainage in low, depressed areas and increase the building energy efficiency. Every 1″ of spray foam adds an R-value of 7. After the white silicone topcoat is applied over the spray foam, the installation provides a nearly 100% insulated roof for improved building energy efficiency and superior waterproofing. And all of this can be done without tearing open the roof, closing the business, or affecting routine business operations.
Process for Restoring a Tar and Gravel Roof
- Remove and haul away all the loose gravel.
- Power wash the roof, clean and dry.
- Make any necessary repairs to ensure a watertight system.
- Apply spray polyurethane closed-cell roofing foam and provide tapering to ensure positive drainage.
- Apply a topcoat spray of high solid (96%) commercial grade silicone elastomeric (white).
- The roof restoration procedure described above provides a 10, 15 or 20 year labor and material warranty with NO exclusions for ponding or standing water.
- This process may also qualifies for cash rebates from local energy service providers.