Roofing and Cladding screws and accessories
Teepee Products Ltd Telephone 0118 9757776
A leading manufacturer of the nylon Bi-hex cladding screw and home of the tek screw since 1994
RUSPERT 500HR COATING
We have all our fasteners, whenever possible, coated with a 500 hour Ruspert Coating.
Ruspert is a multi layered high corrosion resistant coating. Typical test reports show no signs of corrosion even after 1000 hours of testing.
How does Ruspert compare to other coatings and is it a necessity?
Typically an 8µ Zinc with clear or yellow passivation will have well below 80 hour SST before sever corrosion occurs.
BUT there are screws that were installed over 30 years ago with a standard 8µ Zinc plating without any sign of breakdown or rust, what so ever, on the underside of roofs?
BUT again where caps have come off or perished over time (UV light will break down and make polyethylene brittle over a prolonged number of years) then heads of screws and washers on the exterior, open to the elements, have rusted. So in benign environments an 8 or even better a 12µ Zinc plating “should be” adequate if caps stay on.
If having to use caps it is always a good idea to apply some MAGBPRO or similar (Silicone if all that is available) to each head to bond the caps to the heads. This can increase protection considerably.
A 5µ standard commercial BZP is never suited in external (or in many cases internal) uses. Although stating 5µ the middle threads and under head could well have less than 1 or 2µ, as plating is never uniform, and protection will have almost gone completely even before installation.