Actual Size Of 2x8 Typical Floor Joist

However there is a difference between the nominal size what the lumber is referred to and the actual size.

Actual size of 2x8 typical floor joist.

If you can stop someone in the store to help explain the inconsistency they ll start throwing around a few words like nominal sizes and actual sizes and softwood lumber and hardwood lumber. Though joists may be any size that you desire using typical floor joist and beam specifications ensures that you can find hardware to fit the joists and that the floor provides adequate support for furniture and other items in a room. 2x10 to 15 feet and 2x12 to 18 feet. Dead load weight of structure and fixed loads 10 lbs ft 2.

1 ft 0 3048 m. 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. 2 grade of douglas fir are indicated below. Measure the actual width and thickness of a pine board like a 2x4 and then look at the sign above the rack.

1 psf lb f ft 2 47 88 n m 2. Floor joists or beams provide the below surface support for the wood subfloor of a room. Actual dimensional lumber is cut to a specific length width and depth. Mitek usp makes one for each joist size between 2x4 and 2x10 the one for 2x10s also works for 2x12s in its jlif product.

True floor joist span calculations can only be made by a structural engineer or contractor. If the design calls for concealed or in turned flange hangers simpson strong tie only makes two sizes in its luc product one for 2x6 and 2x8 joists and a larger size for 2x10 and 2x12 joists. 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. If the joist spacing will be 16 inches 406 4 mm a joist size of 2 x 8 should be used even if the length is only 8 feet 2 44 m.

Joist span and spacing is set by your local building code. Maximum floor joist span for no. Live load is weight of furniture wind snow and more. A 2x8 up to 12 feet.

Common joist spacings for 2 by 10 joists and other dimensional lumber sizes are 12 16 and 24 inches. Something doesn t quite match up. The larger the deck the larger the 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.

In typical deck construction with a ledger on one side of the joist and beam on the other the size of the joists is driven by the size of the deck and based on the general maximum spans mentioned above.