Want to remove a portion of an existing structural wall (16" on center - east to west). Will need to span 11'. Single story home. Rafters are 2x4's and 24" on center spanning approximately 28' (north to south).What size steel I beam is required? How many 2x4's do I need on each end to support the I-beam?
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.
Is this an interior wall or an exterior wall?
Is it supporting a floor or a roof?
I understand fully.
Interior wall. Beam to support a roof.
Is there an attic?
The rafters are 2x4's spanning 24'?
That doesn't sound right
That really doesn't sound right?
Are you sure the wall supports the roof?
Is that 28' from wall to eave or from eave to eave?
What is your city/state, so I can look at snow loading?
It appears to be a support/structural wall. when I twist on the 2x4's that are 16" on center, they do twist easily like they are not supporting weight.
Is the 28' from the wall in question to the eave on each side or the total from eave to eave (14' on each side of wall?
14' on each side of the wall.
Ok, assuming it is supporting the roof (I'm not conviced it is), then you can plan for a W6x15 ASTM A992 Gr. 50. It's 6" deep and weighs 15 pounds per foot.
I would use a single 4x6 to support each end.
I'm not convinced it is supporting either. Why do you not believe it is a supporting wall?
Please have an engineer detail the connections for you to ensure overall stability.
I believe it's a supporting wall, but only for the attic. In my experience, it's not common to have an interior wall support the roof. For the size of the beam, though, I wouldn't worry about it. Let's assume it does (which I did) and the size is not much different than if we said it didn't
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I do have a friend who is a P.E.
No problem and best of luck.