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Joist hanging over beam

4K views 16 replies 7 participants last post by  KennMacMoragh 
#1 ·
What is the most a 2x can hang over a middle beam. In other words, it was 2x8's joist supported by a beam in the middle. The joist were hanging over beam- lapping 15". I cut them down to 6" lap. Thought it was code, no more than 12". Ps I'm not talking about an end overhang like a bay, this is the middle support joist on either side.
 
#13 · (Edited)
Here's the paragraph including what HDavis put in........

R502.6 Bearing. The ends of each joist, beam or girder shall
have not less than 1.S inches (38 mm) of bearing on wood or
metal and not less than 3 inches (76 mm) on masonry or concrete
except where supported on a I-inch by 4-inch (2S.4 mm
by 102 mm) ribbon strip and nailed to the adjacent stud or by
the use of approved joist hangers. The bearing on masonry or
concrete shall be direct, or a sill plate of 2-inch-minimum (SI
mm) nominal thickness shall be provided under the joist,
beam or girder. The sill plate shall provide a minimum nominal
bearing area of 48 square inches (30 86S square mm).

RS02.6.1 Floor systems. Joists framing from opposite sides
over a bearing support shall lap a minimum of 3 inches (76
mm) and shall be nailed together with a minimum three 10d
face nails. A wood or metal splice with strength equal to or
greater than that provided by the nailed lap is permitted.

R502.6.2 Joist framing. Joists framing into the side of a
wood girder shall be supported by approved framing
anchors or on ledger strips not less than nominal 2 inches
by 2 inches (SI mm by Sl mm).

There was a bar by the bottom of the first paragraph but nothing on R502.6.2..
 
#16 ·
The further past the beam, the more chance the floor will hump up at the end and/or develop squeaks.

Think of a board on the flat between two blocks. Stand on the middle of the board, and the two ends come up. Same deal when you're doing floor joists. Code says large overhang is OK, but experience says limit it.
 
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