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I can help. Do you have any pictures you can share with me?
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So you need a beam sized to clear span 24'. The beam will support one end of the 16' span floor joists and the other end of the 16' span floor joists will be supported by the wall of your building?
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.
Let me run a few numbers for you.
I can give you an engineered wood option for your 24’ span beam:
5-1/4” x 16” Versa-Lam 2.0 3100 DF
This is a Boise Cascade product and you can go to the following link to find distributors in your area. http://www.bc.com/locations/#!/building-materials-distribution
You will need to have a local engineer detail your connections, size your support columns, and determine foundation requirements.
I will also run some numbers for a steel beam option.
A steel beam option get pretty heavy, I would stay with the engineered lumber beam, it is much easier to work with in the field.
You will need to provide solid mechanical connections between each of your floor joists and the proposed LVL. This will provide the needed lateral bracing for the beam.
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Good Luck with your project!