Installation Guide

Drilling
Temperature change causes sheets to expand and contract. Any
resistance can cause sheet distortion. Always pre-drill holes to allow for
thermal movement, providing enough space for seasonal temperature
uctuation.
• Use only new or sharply ground steel or carbide tipped drill bits.
• Drill at a low speed. Support sheet underneath to avoid vibration.
• Pre-drill holes 1/16” larger than the screw’s diameter.
• Do not drill within 1-1.5 inches from the edge of the multiwall sheet.
Note: Before fastening, remove dust or debris from sheet surface with compressed air or a vacuum.
Fastening
Attach sheets to the purlins using fasteners recommended for your specic application. For proper point
fastening, at least a 1/2” neoprene bonded washers should be used with screws.
• Forty-eight inch (48”) wide sheets should be fastened to supports at all four corners, and at
points 6 inches in from the edges of each purlin support.
• Seventy-two inch (72”) wide sheets should be fastened in the same way, with an additional screw
in the center of each purlin support.
• Drive fasteners perpendicular to the multiwall sheet.
• Do not overtighten screws. Overtightened screws may cause sheet to dimple. A correctly
installed fastener will sit ush against the sheet.
• Double check that all fasteners are properly secured.
Note: Fasteners should penetrate
the structure by at least one (1) inch.
Depending on the structural material
being used, a larger washer may be
needed. Washers distribute load to a
wider area and help protect the surface
of the sheet from being damaged.
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MULTIWALL POLYCARBONATE
Technical & Install Guide