Purlin laps must be bolted in the top web hole and the lower flange holes at both ends of the lap. Bolting only the web of lapped purlins does not provide full structural integrity and excessive loads can be placed on the roofing screws that penetrate both purlin . . Powers Mini Clip Installation. Our patented Mini Clip has a solid grip on PV panels. Among the critical. . Did you know that 23% of structural failures in rooftop PV arrays stem from improper purlin hole punching? With solar installations projected to grow by 40% globally in 2024 according to the Renewable Energy Market Review, getting these specifications right has never been more critical. Last. . Alternative hole sizes,shapes and centres are possible,subject to enquiry. Stramit recommends that bridging be installed such that the maximum unbraced length is 20 x D(where D is the purlin web height),or 4000mm whichever is the least.
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