(1) Sections of wood (which may be preservative-treated) built into a roof or waterproofing assembly, usually attached above the deck and below the membrane or flashing, used to stiffen the deck around an opening, act as a stop for insulation, support a curb or serve as a nailer for attachment of the membrane and/or flashing; (2) wood crossmembers installed between rafters or joists to provide support at cross-joints between deck panels; (3) cohesion or adhesion between similar or dissimilar materials in roll or sheet form that may interfere with the satisfactory and efficient use of the material.

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