Roof truss structural detail CAD blocks layout file in autocad format, struts detail, front elevation detail, nut bolt required for joints and connection, welded and bolted joints, top elevation detail, roofing material detail, purlin detail, hidden line detail, dimension detail, principal rafter detail, main and sag tie detail, riser and pitch detail, specification detail, roof span detail, column support detail, numbering lines detail, hatching detail, etc.