Building materials used for repairs are not covered for

Steel: Steel is one of the strongest building materials available with excellent strength capacity in both tension and compression.
Because of its high strength-to-weight ratio, it is ideal for structural framework of tall buildings and large industrial facilities.

A dutchman, or in some uses graving piece, is a matching piece of good material used to replace a relatively small damaged area that has been cut out of a larger item, to avoid having to replace the entire item; or, any of various techniques for accomplishing such a repair.
In some cases, the meaning has been extended to include small pieces that are inserted between units of a larger structure as a planned part of the construction process, rather than as an ad hoc repair.
The term is used in woodworking, masonry, railroading, boatbuilding, theater, and other fields.

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