I can help
Do you have any plans or sketches you can share with me?
I need to know where the beam you are asking about is located? Is it a ridge beam for the roof or is it going to be a cross beam to support your ceiling joists?
What city and state do you live in?
OK, so ridge beam to support 20' span roof rafters and another beam to support the 20' span ceiling joists?
1. So we are only talking about beams to hold up the ceiling joist, correct? If so, will there be any storage or occupancy in the attic area above the ceiling?
2. A 40' clear span for a laminate beam is very large, thus you would require a huge beam. I can run numbers for a 40' clear span.
Sorry for the delay. I am travelling to day and am responding right now from the airport during a layover. I will run some numbers this evening when I arrive home. Thanks
Before we get started 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 can give you an engineered wood option for your 40’ clear span ridge beam, assuming a Live Load = 20 psf (no Snow Load) and a Dead Load = 10 psf:
7” x 24” Versa-Lam 2.0 3100 DF
There will be approx. 2.25" of deflection at midspan under total load.
I can give you an engineered wood option for your 40’ clear span ceiling beam, assuming a Live Load = 10 psf and a Dead Load = 10 psf:
7” x 22” Versa-Lam 2.0 3100 DF
There will be approx. 1.75" of deflection at midspan under total load.
These are Boise Cascade producs and you can go to the following link to find distributors in your area.
You will need to have a local engineer detail your connections, size your support columns, determine foundation requirements, and check your structure’s lateral stability.
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