Floor Beam Girder Connection

The numbers in gray indicate the distance between the support posts.

Floor beam girder connection.

Generally newer home floor joists are made from 2x8s or new engineered i beams older homes however may have 2x6s instead. Normal spacing is 16 inches on center from center to center though some floors may have joists on 12 inch or 24 inch centers. Our floor joist beam can span a maximum of 13. Floor joists spaced on regular intervals span the areas between supports such as walls foundations girders and beams.

A double 2x12 beam can span 12 feet. Dimensional lumber deck beam span chart. While it is a good idea to replace rotted material with 2x8s it may require some notching to fit between the sub floor and ledger board. Of solid wood over posts.

You may hear the words girder and beam used interchangeably but important differences distinguish the two from one another. True floor joist span calculations can only be made by a structural engineer or contractor. The post or column should rest on a foot ing that meets local building code requirements. Understanding how a girder is different from a beam is a necessary skill for any builder engineer or construction worker.

Girder post anchor bolts sill sealer figure 3 1 the starting components for a floor system chapter three glossary refer to figure 3 1 for locations of components described below. Floor joists rest on top of the girders and the floor you walk on sits on top of the joists. Numbers in blue are joist spans beam to beam or house to beam. A 2 2x10 can span 10 feet and so on.

In the table above the widest floor beam span for 12 of supported floor joists is 14 7 if using a 5 ply 2 x 12. The building code makes no distinction between posts that are 2 feet tall or 10 feet tall and only requires one nail be used to attach the bottom of the post to the concrete block and nothing such as pier caps is required to attach the top of the post. Anchor bolt a special fastener connecting the sill plate to the foundation wall. Beams should be supported by at least 1 in.

So we now have adequately sized floor joists and an adequately sized floor joist beam for our 24 x 13 house. 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. Girders are the main horizontal supports of a structure and support smaller beams. Learn how to make structural repairs by sistering floor joists.