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3/17/2022
walkereng, Consultant
Category: Structural Engineering
Satisfied Customers: 5,398
Experience: Over 35 years of Structural Engineering experience.
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Do you have any pictures you can share with me? Once you provide this information, hopefully, we can get your question resolved quickly. Here is the way to share files with me: https://www.justanswer.com/help/search?f=share+files
Customer replied 10 months ago
This is the room with pictures of the rafters and ceiling joists.
Customer replied 10 months ago
This is how I would like to do the ceiling joists.
I’d like to point out that a Professional Engineer’s standard of care typically includes a site visit to assess field conditions and get an overall understanding of the structure. This can obviously not be accomplished through the internet. The information provided here is meant for planning purposes only (general sizing and budgeting) and is based on the information provided by you. All loading cases considered are for vertical loads only, no lateral analysis has been completed. The information should be verified by a professional engineer who can visit the site to ensure that potentially important information has not been overlooked or omitted.
I ran rough numbers for a double 2x6 (SPF #2), spanning 17', spaced at 24" o.c., with a roof Live Load of 20 psf and a roof Dead Load of 10 psf.
The results showed the double 2x6 would be at 130% of its allowable Bending Stress (overstressed) and the Total Load deflection would be at 215% of the allowable. The double 2x6 option will not work.
You would need to sister a new 2x10 to each of your existing 2x6's to meet Code.
walkereng, Consultant
Category: Structural Engineering
Satisfied Customers: 5,398
Experience: Over 35 years of Structural Engineering experience.
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