A leader of the Save Schenley movement last night made a last-ditch appeal to save the Pittsburgh Schenley High School building, but Pittsburgh Public Schools officials again insisted the structure isn't safe.

The back-and-forth came at a special school board workshop on high school improvement, giving board members one last look at the issue before a scheduled vote tomorrow on Superintendent Mark Roosevelt's proposal to close the Oakland landmark.

At the request of member Mark Brentley Sr., Oakland resident and Schenley supporter Nick Lardas was invited to the floor to give his interpretation of engineers' and architects' reports on the building's condition.

Board member Theresa Colaizzi, angry that Mr. Lardas was given time to speak, stalked from the room and returned after he had finished.

Mr. Lardas said the reports, commissioned by the district, show that the building remains safe for students and that there's no widespread collapse of asbestos-containing plaster. But district officials said the architects and engineers repeatedly have told them that the district no longer can risk exposing students and staff to asbestos.

Mr. Roosevelt and Paul Gill, the district's chief operations officer, said the qualifications of their industrial hygienists and other experts trumped those of Mr. Lardas, a civil engineer and contractor.

"He's not an expert in this field," Mr. Roosevelt said.

Board members Mark Brentley Sr. and Randall Taylor assailed Education Committee Chairman Thomas Sumpter, who presided at the workshop, for using the first 90 minutes to list and rank members' concerns about improving the district's high schools.

The pair wanted to spend the time asking administrators about Schenley and other high-school issues up for a vote tomorrow.

"What kind of game are we playing here?" Mr. Brentley said.

Mr. Taylor said the listing and ranking of concerns on large sheets of paper was a "filibuster" designed to prevent discussion of controversial issues. When Mr. Sumpter asked him to rank the concerns written on the sheets, Mr. Taylor said, "Hand me a couple of darts, and I'll throw them over there."

Mr. Sumpter said the board was divided into "two camps" on Schenley. He said some of his colleagues didn't understand that the workshop was intended to be an exercise in policy analysis, not a "rabble-rousing" session or forum for discussing Schenley exclusively.

Before the workshop, about six parents and other supporters held a news conference outside district offices to protest the proposed merger of the middle-grade and high-school arts schools. Among other complaints, the group said there wouldn't be enough space in the Downtown building to accommodate both schools.

Because of rain, the group tried to meet inside board offices but were told to leave.