PROVIDENCE – The Rhode Island carpenters union Local 94 has been out on strike since Monday after voting to reject a final contract offer from the Rhode Island Chapter of the Associated General Contractors of America.

The carpenters voted 400-to-1 in favor of the strike last Saturday, according to the union Web site. “All building and heavy/highway members of Local 94 are instructed not to report to work,” a post on the Web site said.

However, three major projects – the new Blue Cross & Blue Shield Rhode Island and Women and Infants Hospital buildings in Providence, and FM Global’s new headquarters in Johnston – are not being affected by the strike because they are operating under a project labor agreement, the union said.

A previous four-year agreement between the carpenters and the contractors expired on June 7 but was extended for an additional two weeks. The two sides are at loggerheads over wages and benefits, but the union has declined to detail its objections publicly.