Claim arising out of corrosion of chilled water risers for office premises.  Claim for contribution by M&E sub-contractors against insulation sub-sub-contractors on basis that insulation sub-sub-contractors would be liable to building owner for the corrosion damage to the risers.  Insulation sub-sub-contractors asserting that damage to risers would fall to be treated as pure economic loss and seeking summary judgment.  Whether Murphy v. Brentwood meant that damage to risers should be treated as damage to other property; whether issue suitable for determination on a summary basis.