Sub Floor Construction Details

Although cold formed steel framing for floor systems also is permitted by the irc it is not covered here.

Sub floor construction details.

On wood frame floors the subflooring provides a continuous structural surface over the floor joists. Joists are typically shorter and lay across the beams to give them horizontal support. Beams are thicker and longer and are laid vertically. The subfloor is the foundation beneath finish flooring materials.

Or the subfloor may be made of plywood or other panel products that are laid perpendicular to the joists. Rather the reader is referred to the aisi standard for cold formed steel framing prescriptive method for one and two family dwellings aisi 2001 for guidance. Good subfloor construction depends on material selection and attention to critical details. The subfloor is the bottom most layer and it rests on the joists.

It may be made of boards laid either at right angles or diagonally across joists. If you have a concrete slab floor the slab may be considered the subfloor. In basements and in homes with slab on grade foundations the subfloor may simply be a concrete slab. 69 chapter 4 floor construction woodframe floor systems and concrete slab on grade floors are discussed in this chapter.

Beam and joist arrangements can form a supporting frame for a floor.