The pull-out strength depends primarily on the gauge of the purlin. A #14, which I believe equals ¼, ranges from 141 lbs (26 ga) to 4,550 lbs (3/16 plate), according to Dynamic Fasteners catalog, page 67..
Allan Sindelar [email protected] NABCEP Certified Photovoltaic Installer EE98J Journeyman Electrician Positive Energy, Inc. 3201 Calle Marie Santa Fe, New Mexico 87507 505 424-1112 www.PositiveEnergySolar.com <http://www.positiveenergysolar.com/> One must wonder if the pull-out resistance of the 1/4" Tek screw is adequate for the wind-loading etc. There's some math to be done which may point to the need for bigger diameter screws anyway. Jolliness, Mick Abraham, Proprietor
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