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BS 7021:1989 Code of practice for thermal insulation of roofs externally by means of sprayed rigid polyurethane (PUR) or polyisocyanurate (PIR) foam
standard by BSI Group, 06/30/1989
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Procedure for applying foam externally as thermal insulation to roofs and tanks.Cross References:
BS 476:Part 3
BS 747
BS 1088