Floor Framing
House vs. Shed
The floor structure has to be strong enough to withstand the weight of furniture (also called dead load) and the abuse of every day traffic (also called live load). A floor that is properly assembled won’t squeak under pressure.
The structure of a floor resembles greatly to the structure of a wall. The main differences are the materials used during construction.
Today’s houses have floors or made of pre-manufactured joist. These pre-manufactured joist are 10” to 16” in height depending on there length and on the load that they will have to carry. The joists are usually made of three individual pieces. The top and bottom are usually made of 2X3 allowing enough room for sheets of plywood to be securely fasten to them. The center of the joist is either made of steel braces or composite wood.
Here are some examples;
For a shed, the floor joist used are usually pressure treated 2X4 at every 24" center. If you know that the shed will be used to support heavy equipment + where a lot of moving in and out would be frequent, then consider using 2X6 at every 16" center (might even go to 12" center depending on the load)