Q.: We have to embed metal sleeves in a concrete floor slab and are concerned about corrosion. The sleeves protrude 4 inches above the floor surface. What's the best metal to use for this purpose?

A.: If no chloride-containing admixtures are used in the concrete and the floor isn't in a corrosive environment, steel sleeves should work fine. If the floor is in a corrosive environment, use either stainless steel or heavy-duty plastic sleeves.