HomeMy WebLinkAboutLETTER - WEIGHT OF ROOFING MATERIALS - 10-2018John M. Foster - Architect
Member - American Institute of Architec - D O b 018
11205 Ridge Ave.
Fort Pierce, Florida 34982
Florida Reg. No. 8511
Mr. Terry Mager���
Mager Construction�L��le
Palm City, Florida C007ty
Comparison - Weight of Roofing Materials
Per your request, I have investigated the comparable weight of Boral
coated steel Barrel Vault roof shingles compared to industry standard
cedar shakes.
Per IC ES Evaluation Report #ESR 1491, the weight of a single coated
26 gage steel Barrel Vault tile is 5.78 pounds. Net coverage of the shingle
is 14" x 42" or. 4.08 square feet yielding a material weight of 1.42 PSF or
142 pounds per 100 square feet. An internet search resulted in the
,following information:
Hand -split shakes have two grades: Premium (all edge grain) and Grade
11 (up to 20 percent of the shakes can be flat grain, which is more
susceptible to curling) .
Taper -sawn shakes are as thick as hand -split shakes and are sawn
smooth on both sides. They come in three grades: Premium and Grades
11 and 2.
Average dry weight per square: 160 to 320 lbs.
Average wet weight per square: 320 to 560 lbs.
Therefore, the proposed metal Barrel Vault tile is lighter than any cedar
shake 'roof. If there are any questions regarding this evaluation, please
conta t4pa-as listed above.
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