11/02/2026
You can build with the best treated lumber on the market and still have it fail early… if you use the wrong screws.
The waterborne preservatives that protect treated Southern Pine are corrosive to ordinary steel. Standard fasteners can rust out in just a few years, while the wood around them is still going strong.
The result is loose boards and failing connections on a deck that should’ve lasted decades.
That said, the fix is straightforward: use hot-dip galvanized fasteners at a minimum, and stainless steel for coastal or high-moisture environments.
Check that your hardware—joist hangers, screws, bolts—is rated for use with treated wood.