Porch Beam Size Help

[Branden Battig]

I am building a garage 28' (Gable End) x 32' (depth) with a 10' overhang porch. I originally sized the porch to have 2x8 rafters (24" OC) attached 2-2x10 beams attached to 6x6 posts @8' OC.

I did not like the layout of the 8' OC and want to change to 10'8" span on the beams. I am having trouble calculating the beam size. I am in NE Ohio so I am using a 20psf snow load and 15psf dead load. I plan on finishing the underside of the porch with additional rafters and barn siding.

My burning question is the double 2x10 beam enough to span the 10'8" OC posts on the porch?

 

[classicT]

Can you please clarify what the tributary length of the rafters landing on the beam is?

Sounds like the rafters span 10-ft from the exterior wall to the beam, which would be 5-ft of tributary. Add in a foot for an eave, by my guess you have 6-ft of tributary acting on the beam.

This is what my calculation looks like then.

 

[classicT]

A triple 2x12, a 3-1/2"x7-1/2"GLB, or a 5-1/2"x6"GLB check out via the same calculation inputs.

 

[Branden Battig]

"Sounds like the rafters span 10-ft from the exterior wall to the beam, which would be 5-ft of tributary. Add in a foot for an eave, by my guess you have 6-ft of tributary acting on the beam." ~ CORRECT. 10-FT RAFTER SPAN WITH 1' EVE.

Is your 1st post saying a 2ply 2x10 (hem-fir) will work? What about a No. 1 Southern Yellow Pine?

I downloaded a trial of the sizer app, looks awesome, just a lot to learn. Thanks for your help.

 

[Branden Battig]

Oh Nooo, So sorry. I see now it FAILS in bending. Thank you for your help.

 

[classicT]

Glad I was able to help. Not sure if I previously have welcomed you to the forum, but welcome.

If you find yourself here looking for some input, consider sponsoring the forum by becoming a Sawhorse. Helps us keep the lights on around here.