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Securing the top together.
The A structure with open wood-framed roofs, often latticed and supported by regularly spaced posts or columns, and covered by climbing plants such as vines or roses, shading a walk or passageway. Pergolas are distinguished from “arbors,” which are less extensive in extent and structure. roof structure is locked together by fixing Covered with a protective coating of zinc. A short nail with a large flat head used for securing roofing felt, plasterboard, sheet metal to wood etc. plates on the top edges of the rafters, blockings/nogs and decorative ends.