Posi-Joists, also known as metal-web joists, combine timber chords with an open metal web.

The open sections provide convenient routes for electrical cables, plumbing, ventilation ductwork and other services through the floor structure.

This can significantly simplify work for follow-on trades because there is less need to drill through solid floor joists.

They can also accommodate longer spans and help create a coordinated floor and services zone within the house.