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StructuralEng
StructuralEng, Consultant
Category: Structural Engineering
Satisfied Customers: 6745
Experience:  Structural Engineer
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I recently opened my kitchen ceiling to find the middle 10'

Customer Question

I recently opened my kitchen ceiling to find the middle 10' wide span of the 10' x 20' long room sagging a bit. It has a 2"x8" across the span - clearly not quite enough to hold steady - has gable end roof above. House is 60 years old and sagging isn't moving, just want to correct before putting new sheetrock up. Would like to jack sag out and sister a LVL with the 2"x8" to stiffen up, but wondering what size LVL to use.
Submitted: 6 months ago.
Category: Structural Engineering
Expert:  StructuralEng replied 6 months ago.

Hello

Expert:  StructuralEng replied 6 months ago.

I can help.

Expert:  StructuralEng replied 6 months ago.

Are the 2x8's spanning the 10' direction or the 20' direction?

Expert:  StructuralEng replied 6 months ago.

Are these joists supporting the attic only?

Customer: replied 6 months ago.
The 2x8 (there is only 1) spans the 10' direction. It supports the attic/roof only. I'll upload a picture to help explain situation.
Expert:  StructuralEng replied 6 months ago.

Is this 2x8 supporting perpendicular roof framing?

Customer: replied 6 months ago.
The red arrow line is the 10' span where 2x8 in question is.
The green dotted lines show where the ridges of two roof lines are (gable ends left and right on main roof, smaller gable on top off kitchen). The blue line shows the actual frame of the kitchen part of house - the extra overhang is over a deck.
Customer: replied 6 months ago.
The 2x8 is where the rafters from the main roof line rest.
Customer: replied 6 months ago.
The house is built with post and beam, exposed vaulted ceilings - only the kitchen has a sheet rocked lower ceiling.
Expert:  StructuralEng replied 6 months ago.

Something isn't quite making sense.

Expert:  StructuralEng replied 6 months ago.

If the 2x8 is running left/right and the rafters are running left/right, what is the 2x8 supporting?

Customer: replied 6 months ago.
The main roof rafters run bottom/top off of the horizontal green dashed line (this is the main roof line).
They are what are sitting on the 2x8.
Expert:  StructuralEng replied 6 months ago.

Is the beam supporting the rafters or just the ceiling joists?

What is the city and state so I can look at snow loading?

Customer: replied 6 months ago.
I guess its just the ceiling joists. There aren't rafters I guess - the roof is all tounge and groove, joists come down off main beam in center. Portland oregon.
Expert:  StructuralEng replied 6 months ago.

What is the joist length on each side of the beam?

Customer: replied 6 months ago.
about 14' - and 4 of them connect with the 2x8
Expert:  StructuralEng replied 6 months ago.

You will need a double 2x12 doug-fir no. 2.

Customer: replied 6 months ago.
A 2x12 won't fit - there isn't room for it - a 2x8 is all that will fit. That's why I was thinking of an LVL to sister on the original 2x8 doug fir.
Expert:  StructuralEng replied 6 months ago.

You would need three 1.75" x 7.25" LVL 2.0E

Customer: replied 6 months ago.
to replace the existing 2x8? Or in addition to it?
Expert:  StructuralEng replied 6 months ago.

Either. You need*****

Customer: replied 6 months ago.
okay - thanks.
Expert:  StructuralEng replied 6 months ago.

No problem. I'm happy to help. Good luck with your project.

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