Polybutylene Piping Through Girder Typical building practices do not make allowances for drilling, cutting, or notching in girders or beams. Also, polybutylene (PB) supply lines were used as water distribution piping in many homes built from the mid 1980''s until the mid-1990''s. The piping and associated fittings have had a failure rate and subsequent leakage sufficient to have been the subject of several nationwide class action lawsuits. Copper and brass fittings used in later years seem to have reduced the failure rate, but the piping may still fail due to problems with poor installation, improper handling, or chemical reaction with the water supply.