Requirements for Fastener Testing

1. Fastener systems, including washer, must not deteriorate to the extent that their intended function is impaired, for a minimum of 15 years or the life of the cladding.
2. Fastener systems must not detrimentally affect the material being fastened for a minimum of 15 years or the life of the cladding.
3. Colour adhesion and colour fastness are required to be similar to that of the cladding for a minimum of 10 years.
4. Some shank corrosion is acceptable on screws with shanks exposed to the weather after 10 years.

The head mark on the self-drilling screw shall clearly show the manufacturer’s unique head mark and identify the corrosion resistance classification.