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I am making hurricane panels for my house using the technique described here.

The plywood I purchased is pressure treated. The sliding bolts are zinc, so I assume the screws that came with them are also zinc. Is this ok, or should I be using different screws and/or bolts?

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1 Answer 1

up vote 12 down vote accepted

They are not actually zinc, but zinc-coated steel, also known as galvanized steel.

The treated-wood industry recommends the use of hot-dip galvanized or stainless steel fasteners for use with treated wood. Electroplated/electro-galvanized and mechanically-galvanized coatings should not be considered to be hot-dip galvanized. (Class 55, or higher, mechanical galvanizing provides galvanizing equivalent to the hot-dip galvanizing used on connectors and fasteners.)

Source: Strong-Tie's pressure-treated wood FAQ, which has additional information about various kinds of pressure-treated wood, galvanized steel, and stainless steel.

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+1 definitely hot-dipped galvanized steel. If you don't, the screws will rust and rot. Just did this when I built my extra room. –  staticx Aug 18 '10 at 18:59

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