Spanning 31 ft from a set of dual 6x6 wood posts to another like set (garage door opening underneath). Load above is a 10' deep, 26' wide deck nominal weight with possibility of increased weight of humans utilizing deck. Need size of I beam to use.
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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 informational purposes only (general sizing and budgeting) and is based on the information provided by you. 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.
The joists framing into this beam will be 10' long?
Can you tell me your city and state so I can look at snow loading?
Joists are 10' long 16" on center (2x8). Crab Orchard, TN, but live at 2650 feet. Abnormal snows are 60-70" per year with a 20" snow a 20 year event.
You can plan for a W10x60 or a W12x50 ASTM A992 Gr. 50. The first number is XXXXX depth in inches and the second number is XXXXX weight of the beam in pounds per foot.
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This is a 10" or 12" metal "I" beam???
Correct. The first number is XXXXX depth in inches and the second number is XXXXX weight of the beam in pounds per foot.
Can you tell me exactly what you were looking for that I didn't provide that prompted you to give me negative feedback?
It seems excessive as I have 8" I beams holding up the load bearing walls of my 2 1/2 story house. 10" I beam to hold up a 10' deck, even at that span seems excessive. Can you verify your numbers again?
I understand it may seem excessive to you, but what I will say is the following:
1) I'm 100% positive you don't have 8" beams spanning 31' in your house. The span is taken to the 4th power in the deflection equation, so it's FAR more important than the load.
2) The beam is doing work in weak axis bending as well as strong axis bending, because it's acting as a beam in the opposite direction for wind blowing on the front of your garage. This is also something that the beams in your house don't have to deal with.