Floor Joist Supported By Ledger

True floor joist span calculations can only be made by a structural engineer or contractor.

Floor joist supported by ledger.

Toenail decking joists into position along the wall ledger using a galvanized 16d nail. Most decks are supported in part by a ledger that is attached to the band joist or rim board of the floor system. In general the use of ledger strips is accompanied by strict regulations. The most common example can be seen in a basement or crawlspace where a large main beam runs down the center of the space and is supported every 8 feet or so with a column or concrete pier.

Not supported rarely does rot occur only in the center of the joist but on occasion the most damage does occur there and it may seem easier to just span the rot. Joists supported by beams 1 floor joists may be supported on the tops of beams or may be framed into the sides of beams. Having joists in the storage shed would definitely help to create more space for bulkier items as they are able to support a much heavier weight. Ledger strips are boards nailed to the side of a beam to form support 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. Make sure the top of the joist is even with the top of the flashing on the wall ledger so that decking will go on evenly. This beam supports the floor joists of the house s ground floor. Joists also may get support from beams located at or near the middle of the joist span.

For indoors use common not sinker type nails. The ends of the joists would be flush with the ledger strip. Many times floor joists were nailed to balloon framing and if you were lucky the carpenters would also add a 1 2 ribbons or ledger under the joists. But sistering a joist where the new lumber is not supported by either the center beam or the ledger board often only makes the problem worse.

In this application the 2 x 6 floor joists were let in or mortised into a 6 x 6 beam. For outdoor work use hot dipped galvanized nails. I have also seen people build an overhead storage compartment in the shed s ceiling which i think would definitely help to maximize space without using much floor space.