WK84423 Standard Test Method for Determining Resistance of Asphalt Roof Shingles to Hail by Impact with Propelled Laboratory Produced Simulated Hailstones
WK97866 Standard Test Method for Determining Resistance of Asphalt Roof Shingles to Hail by Impact with Propelled Laboratory Produced Simulated Hailstones
WK97114 Determining Walkability of Steep-slope Underlayments