Floor joist and support system therefor

A method for constructing a floor between two spaced-apart support structures, said method comprising:

• pre-forming a number of metal joists sized to extend between the spaced-apart support structures;
• pre-forming two joist rims from metal, each joist rim having a rim web and an upper rim leg protruding from the rim web a first distance and a lower rim leg protruding from the rim web a second distance that is greater than the first distance, each joist rim further having a number of joist attachment tabs integrally formed in the rim web thereof, said number of joist attachment tabs at least as large as the number of pre-formed metal joists;
• supporting the lower rim leg of one joist rim on one spaced-apart support structure and supporting the lower rim leg of the other joist rim on the other spaced-apart support structure;
• attaching the lower leg of the one joist rim to the one spaced-apart support structure and attaching the lower leg of the other joist rim to the other spaced-apart support structure, said joist rims supported on the spaced-apart support structures such that the joist attachment tabs of one joist rim are substantially aligned with corresponding joist attachment tabs on the other joist rim;
• attaching one end of one of each pre-formed metal joist to a corresponding one of the joist attachment tabs on the one joist rim;
• and
• attaching the other end of each pre-formed metal joist to a corresponding aligned joist attachment tab on the other rim joist such that the plurality of pre-formed metal joists extend between the joist rims and wherein at least two joists are adjacent to each other.