Notched Wood Beams

[Gopher13]

Hello!!!

I am designing a softball dugout that has a sloped roof framed with 2 x 6's that bear on a cmu wall (well actually a 2x top plate) on one side and a triple 2 x 10 on the other side. My question is what is the standard practice at the two bearing locations? Are the 2 x 6 beams typically notched? See the attached drawing for clarity.

Thanks!!!

 

[kipfoot]

Yes, a bird's mouth cut is typical at the upper and lower bearing.

 

[dhengr]

Gopher13:
Roofs like these are particularly susceptible to uplift, so pay some particular attention to hold down features. A.B’s. at the bond beams and hold down clips to the sill plates and the front 3-ply beam, then hold down details from the beam to the column and to the end walls. Put some 2x4 blocking btwn. the rafters/joists at the rafter bearing, in every other rafter bay. Maybe the 2x8 sub-fascia will take care of this. Put vert. rebar in each of the cores in the first couple conc. blks. at the outer ends of the end walls, to protect/strengthen those outstanding/unsupported ends. You may want a piece of ‘8" prefinished venting soffit’ at the high end of the roof system, outside of the 3-ply beam, gets some venting air flow. Roof slope and detail at beam bearing on end walls? Column and its base detail? Don’t over-cut the birds mouths. Due to horiz. shear and splitting from the cut, reentrant corners, they do tend to reduce the effective depth of the rafter/joist members, right at the max. shear location. Take a look at the NDS, IRC, IBC, also USP/MiTec and Simpson catalogs for some of the code details.

 

[BAretired]

The note on the drawing reads "Notch 2x6 beam as shown?". I believe it should say "Notch 2x6 rafters as shown."

BA