Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


how many 2x8,s do I need

how many 2x8,s do I need

how many 2x8,s do I need

I have a single family ranch. I need to remove a column in the basement. The original beam is 3 2x8,s with a cloumn every 7'-6'' floor joist are 12 ft long 16" oc. I want to span 16 feet can this be done with 16' 2x8,s along the existing beam? tail of floor joist is 4" past the original I was hoping to put 2 16' 2x8 on each side of the original triple and add columns to support.

RE: how many 2x8,s do I need

By the spanish practice your setup seems to need quite scarce, say 7 independently 2x8 in (all continuous from support to support) collaborating to take 12 ft of floor in a 16 ft span. If you can it will be more efficient to use members of more depth. You would be initally taking 1.4 tonne/m by the spanish evaluation, and to take the same with only 8" deep in the new 16 ft span would take a width of 28 in or 14 such 2x8 members, for a central deflection of a bit less than 1". The practice in your area may be less stringent. In any case, the recommendation of using more depth I see becomes from the evaluation quite clear.

RE: how many 2x8,s do I need

Er, the named deflection is at the end of the life of the structure. A divisor to initial stiffness of 5 has been uses to this purpose, so initial deflection will be scarcely noticeable.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close