Roofing Hail Damage
Roofing Hail Damage
(OP)
Does anyone know of any good sources for info on hail damage to roofing systems? Additionally, Is anyone ever heard of the Haige Engineering Standards, and do they have a web site?
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RE: Roofing Hail Damage
For built-up, modified bitumen, or single ply systems the damage will depend upon the type of surfacing (if any) and the type of membrane. As an example, a gravel surfaced built-up roof is not significantly affected by the initial hail impact, but as the hail accumulates, the asphalt approaches a freezing temperature which then allows fracture by subsequent impact if large enough. Difficult to spot and characterize though. Thermal impact can be significant to any membrane system. Surface temperature can go from 150F to 40F in a matter of minutes, impacting the structure and the membrane.
RE: Roofing Hail Damage
The paper summarizes many sources of hail testing data and proposes kinetic energy as a means of quantifying hail resistance. The required impact energy to cause material indentation, surface fracture, and puncture is presented for asphalt shingles and Built-up roofing (BUR).
NRCA can be reached at 847.299.9070 or at www.nrca.net. The paper is found in the publication: Proceedings of the Fourth International Symposium on Roofing Technology, September 1997.
Haag Engineering's website is www.haagengineering.com