Consequently the top of any ductwork which is close to horizontal should be built up to give rain a good run off and the pib and insulation material should be well supported to prevent puddling. Polyisobutylene also known as pib or polyisobutene c 4 h 8 n is the homopolymer of isobutylene or 2 methyl 1 propene on which butyl rubber is based. Polyisobutylene pib sheeting is a tough water and weather proof and resistant rubber sheet.
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