Floor Joist Plan. A 2x8 up to 12 feet. Floor joists are installed early in the building process and this work is typically done by the framing carpenter since it is part of the structure of the home.
Draw the shape of the moment diagram below. Using Floor Joist Span Tables Wood Species. This a rough guideline.
2 x 6 50 x 150 mm beams ready for the Bettie structure.
Though construction lumber cannot span as far as floor trusses or I-joists it is readily available and when used within its strength capabilities construction lumber will produce a solid-feeling floor system. If the attic joists are not adequate one way to strengthen the floor for live loads is to sister the old joists. Stick to 2x6 2x8 or 2x10 or thicker. There are a number of factors to consider when framing a floor for a home building project including.