SnoClip™s are highly advised on seams of 2" (50 mm) and higher. They are recommended but not mandatory on seam heights of 1-3/4" and lower (45mm). They retard movement of snow and ice beneath the crossmember. SnoClip™ is not always an option as some metal roofing panels have minor ribs or striations that will not allow the SnoClip™ to function properly. SnoClip™s can be used on a striated panel but the results may vary.
SnoClip II™ has 2 locks and is especially made for seam heights of 1” (25 mm) and 1-3/4” (44.5 mm) snap.