Hemlock spruce and redwood have medium bending strength.
Timber floor joist sizes.
These tables can help calculate whether floor joists are strong enough to support themselves and the load they carry without the help of any walls underneath.
Joist span and spacing is set by your local building code.
Joist sizes the wood boards used as floor joists generally range in size from no smaller than 2 by 4 inches to no larger than 2 by 12 inches.
You should check with your local building department for construction requirements in your area.
While most residential construction uses 2x8 joists with 16 inch spacing there are many other factors you need to consider when determining the proper joist span length.
Common species used in house framing include.
Southern yellow pine and douglas fir have high bending strength.
Engineered wood products ewp span and size charts for bci joists.
Surveyors and structural engineers use data from tables below to help calculate the size of timbers necessary to give adequate support to timber floors.