Low - Clear zinc, electrocoating, gray phosphate, black phosphate, heavy zinc electroplate, yellow zinc, type 410 stainless steel

Med - Mechanically galvanized (C-3, N2000® and class 55), Quik Guard®, hot-dip galvanized, double barrier

High - Types 304/305/316 stainless steel, copper, silicon bronze

1. For preservative-treated lumber used above ground, with actual retention levels higher than 0.05 pcf for µCA-C, 0.06 pcf for MCA and CA-C, 0.08 for CA-B, 0.15 pcf for MCQ and 0.2 pcf for ACQ, types 304/305/316 stainless-steel, copper or silicone bronze fasteners are recommended.
2. Borate treated woods are not appropriate for outdoor use.
3. Test results indicate that mechanically galvanized (C-3, N2000 and class 55) and Quik Guard will perform adequately, subject to regular maintenance and periodic inspection. However, the test protocol followed was a modified version of the nationally recognized test method AWPA E12-94. This test method is an accelerated test, so data over an extended period of time is not available. Also noteworthy is that tests run in a laboratory may not correlate to service conditions. If uncertain, use types 304/305/316 stainless steel.
4. Some treated wood may have excess surface chemicals making it potentially more corrosive. If you suspect this or are uncertain, use types 304/305/316 stainless steel, copper or silicon bronze.
5. Ammonia is typically used as a chemical carrier for difficult to treat wood species, such as, but not exclusive to, Douglas Fir and Hem Fir, which are usually found in the western United States. Amine carriers are used in some of the eastern species, such as Southern Yellow Pine. If uncertain, verify chemical with wood treater.
6. Type 316 stainless-steel fasteners are the minimum recommendation for ocean-salt air and other chloride environments.

For the latest Simpson Strong-Tie Quik Drive coating information and additional technical information on this topic, view our corrosion information.