Revisiting a topic that came up in September, the Elementary School Building Committee on Tuesday voted to use a two-sided, L-shaped mock-up structure for testing.

At a previous meeting, Vertex vice president and project director Jeff D’Amico relayed the commissioning agent’s wish to use a six-sided, 10-foot by 10-foot structure, presented as an “alternate” for the new Charleswood School project.

He said the large mock-up, if the committee wanted, could permanently remain on the school site. The structure would feature the same features and materials of the new school and cost between $85,000 and $103,000.

At the time, ESBC member Mike Shepard said it would be “just crazy” to locate a mock-up of that size where it could be seen as people enter the school site.

He said it would be “God awful, ugly and awkward.”

On Tuesday, the board voted for the smaller, standard mock-up, with Shepard calling it “the way to go.”

He pointed out that the Marathon School project had this type and size structure for testing, and it was going to be used for the Hopkins School renovation/addition project as well.

Tim Persson, the school district’s director of facilities, said mock-ups on any construction project are “a necessity … just not to the extent suggested by the engineer.”

Part of the vote indicated that air infiltration testing would take place at the new school building itself. The tests measure how much air is entering the building through gaps, cracks and vent openings.

In other business, the committee voted for Souza True Engineers to conduct a structural peer review, a process required by codes, according to Christopher Kenney, a project manager at Vertex.

The cost for the consultant is $10,450.

Kenney also said architect Perkins Eastman is working with LED on drafting a notice of intent for the Conservation Commission.

He said Vertex would meet with stakeholders including representatives from the Department of Public Works, its engineers, school district, VHB (transportation consultant), fire, police and ESBC to look at the proposed road improvement design.

A presentation will be shared with neighbors soon, Kenney said.

In other action, the board voted to pay invoices totaling $536,433 to Vertex and Perkins Eastman.

The next ESBC meeting is Nov. 19.