Corrosion - Rusting Metal Stair Damage
Corrosion is just another word for rust or oxidation. When certain types of metals are exposed to the weather, especially moisture, they can start to disintegrate.
What you're looking at in the picture above is an A-35
framing anchor that was used to attach a floor joist to a framing plate
sill that was anchored to a raised building foundation.
Even though the framing anchor was made out of galvanized metal, you can see that it's already starting to corrode. If we take a closer look at the nails used to fasten this galvanized A-35 to the framing, the nails are also suffering from corrosion and starting to rust.
This probably wouldn't have happened, if the shower above the framing anchor wasn't constantly leaking, because it was installed incorrectly. However, these are the side effects of poor construction and product installations.
If you read the recommended manufacturers instruction for the A-35 framing anchor, the installer should have used galvanized nails instead of steel. Galvanized metals don't work well with other metals, like copper and steel.
Stairs / Stair Glossary
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