8ft Floor Joist Layout

Floor joist span tables for various sizes and species of wood.

8ft floor joist layout.

Some builders reduce joist spacing to 12 on center to strengthen the deck frame or to increase maximum. How much weight can a 2 8 hold. Most decks use 16 on center spacing for joists. This sample table gives minimum floor joist sizes for joists spaced at 16 inches and 24 inches on center o c for 2 grade lumber with 10 pounds per square foot of dead load and 40 pounds of live load which is typical of normal residential construction.

True floor joist span calculations can only be made by a structural engineer or contractor. All joists are bridged sample floor joist span table. Looking at this table you will see there is a choice in the size of floor joist 2 x 6 2 x 8 2 x 10 or 2 x 12 and there is a choice in the joist spacing 12 16 or 14. Joist span and spacing is set by your local building code.

When building a house or even a deck it is important to confirm you have the correct joist sizes spans and spacing before you get started. 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. The layout term for joists is on center which is the center to center measurement from one joist to the next. Most decking is not strong enough to support longer spans than 16.

The table excerpt above is simply a sample and may not be valid for your region.