Labour's commitment to rebuild schools through the Public Private Partnership (PPP) was no better than the Tories' private finance initiative, the conference declared.
Willie Hart, Glasgow association secretary, said the move was "mortgaging the future". Ancillary staff would be employed by a trust and risked lower wages and poorer conditions.
Jimmy Ross, Glasgow, said the PPP was a dearer way of borrowing and was no more than an accounting exercise ahead of Britain's entry to the European single currency.
John Black, Aberdeenshire, said it would put "an unacceptable burden" on taxpayers in Aberdeenshire for the next 25 years. "PPP is mince and we all know about the warnings about mince."