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had been nailing

  • past perfect progressive
    of nail.
    nail
    noun
    a slender, typically rod-shaped rigid piece of metal, usually in any of numerous standard lengths from a fraction of an inch to several inches and having one end pointed and the other enlarged and flattened, for hammering into or through wood, other building materials, etc., as used in building, in fastening, or in holding separate pieces together.

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Mr. Fogo laid down the mallet with which he had been nailing a loose plank in the flooring, and looked up.

From The Astonishing History of Troy Town by Quiller-Couch, Arthur Thomas, Sir