With a ballasted system the lower layers are not adhered or fastened to the roof structure and the heavy surface layer keeps the roofing in place.
Hail damage to built up roof with ballast.
One of these storm clusters was a beast of a hail storm in colorado.
Commercial and industrial roofs built up roofing polymer modified bitumen roofing thermoplastic single ply roofs pvc and tpo thermoset plastic single ply roofs epdm cspe.
According to the national oceanic and atmospheric administration noaa there was a total of 4 611 hail storms in the united states during the year 2018 with 2019 ending on a higher number as of year end more than 5 396 hail events were recorded although most people think that property and roof damage only occur in rare instances with larger than average hailstones even the smallest.
In this paper we will define the characteristics of hail damage to built up roofs describe our inspection and testing procedures and.
Built up systems are installed by alternating layers of asphalt or tar and supporting fabrics directly onto the roof.
That storm dropped a record setting 4 83 inch diameter hailstone in bethune colorado.
Built up roofing or bur systems have been in use in the u s.
The hail resistance of built up roofs has been known to be substantial especially when covered with loose and embedded gravel in an asphalt flood coat.
Townhome complex roofs with alleged hail damage.
Ballasted roofs hail ca n remove some of the loose.
One special type of built up roofing called ballasted roofing uses large stones about 1 1 2 to 2 1 2 inches in diameter for the surface layer.
In 2019 the united states experienced 5 396 large hail storms as documented by the noaa severe weather database.
However occasional disputes arise in the settlement of insurance claims over the size hail needed to cause damage to a built up roof and what those characteristics are.
Assessing hail damage on gravel ballasted built up roofs in this interview with denise johnson ryan chauncey executive director of operations at nelson forensics explains the difficulty of assessing hail damage on gravel ballasted built up roofs and why hail size isn t enough to evaluate damage.
Severe damage caused by wind and hail damage like this is not uncommon when a combination of large hail projectiles and an intense windstorm combine to inflict serious damage on roofs windows siding and air conditioning units as well as unprotected automobiles and other.
2 1 2 threshold size for damage to well supported ballasted built up.
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These roof systems are commonly referred to as tar and gravel roofs.
