Install Manual

ADDENDUM
Installation Instruction for metal roofing
72
Installation on a Metal Roofing
1. Requirement
･ The Roof Tech P.E. Letters are created for a minimum 7/16” OSB with
2x4” rafters 24 in o.c.
IMPORTANT:
Metal roofs have a high thermal expansion and contraction factor. Screwing
through a standing seam metal roof is not recommended and will also void the
roof warranty. Exposed fastener metal roofs have a lesser impact from
thermal expansion, however attention to the panel length is important.
Consult with the metal roof manufacturer for solar roof attachment
guidelines.