Can you provide any tips on how to properly use stainless steel coil roofing nails?
Here are some tips for properly using stainless steel coil roofing nails:
Use the correct nail length
The nails should extend about 3/4 to 1 inch into the supporting members, like rafters or purlins. Underdriven nails can cause blow-offs, while overdriven nails can damage the members.
Use a nailing schedule
Follow a set pattern or “schedule” for nail placement on the roof panels, based on panel manufacturer recommendations. This ensures proper coverage and wind uplift resistance.
Space nails appropriately
Space nails about 12 to 18 inches apart for standard roof panels. More closely spaced nails may be needed near end laps and corners.
Fasten panels at the high side
Make sure the first few nails are placed toward the high side of the panel to pull it down tightly and flatten any waves.
Drive nails straight and at the correct angle
Avoid nailing at sharp angles that could reduce holding power or damage panels. Typically 15 to 30 degrees from perpendicular is recommended.
Leave 1/8″ gap under nail heads
This allows for panel movement from thermal expansion without damaging the panels. It also prevents water pooling under nail heads.
Avoid overdriving nails
Once the nail head is flush with the panel surface, stop driving. Overdriving can damage panels and reduce holding power.
Use a nibbler for exposed-fastener installations
A roller nibbler tool is best for cutting the coil to length and shaping the nail points. This provides a smooth, finished look.
Using the correct techniques will help you get the most longevity out of your roof while minimizing damage to panels from improper installation. Making sure the nails are the appropriate length, spaced correctly and driven straight will all contribute to a well-installed roof.