Answered: NEC ECC: If an Employer has a contractor with a Contractor to demolish and rebuilt a site, does the Contractor have rights to sell the scrap materials from that site?

It depends what is said in the Works Information/Scope.

If the Contractor is required to simply demolish the building and leave the remains on site (which seems unlikely if construction of a new building is required) then the materials have to be left on site at wherever the WI/Scope says they are to be left.

If the Contractor is required to remove the remains of the old structure from site then, unless the WI/Scope specified what is to be done with them, it's entirely up to the Contractor whether those remains go to landfill, are recycled, or are sold on for re-use.