ClipArt ETC
A framed floor showing floor-joists at a, binding-joist at b, ceiling joists at c, and girder at d.

Framed Floor

A framed floor showing floor-joists at a, binding-joist at b, ceiling joists at c, and girder at d.

A strutted floor made from crossed struts to secure the floor joists.

Strutted Floor

A strutted floor made from crossed struts to secure the floor joists.