I’m planning to apply a prefinished hardwood floor over existing sheet-vinyl flooring. What do I need to know to do the job right?

A. Daniel Boone, a wood-flooring contractor and instructor in Jacksonville, Fla., responds: Start by evaluating the existing floor assembly. The new hardwood flooring must be installed on a wood subfloor of approved thickness that is at or above grade, flat, and well-fastened to appropriately spaced joists. You can check the joist spacing from...

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