Contact US

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!

*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

Masonry Wall - Connecting new 8" cmu wall to existing 8" cmu wall

Masonry Wall - Connecting new 8" cmu wall to existing 8" cmu wall

Masonry Wall - Connecting new 8" cmu wall to existing 8" cmu wall

I have a project involving a one story, steel framed building with exterior 8" block walls (single wythe, no veneer). Open web roof joists frame to interior columns and beams, and bear on the exterior block walls on the northern and southern face of the building (joists run from north to south).

A portion of the building will be demolished and removed, and a new 8" cmu wall will be installed at the southern face of the building. This wall will be the new exterior wall, and support existing roof joists (which will be cut and reinforced per the demolition process).

Does anyone have any suggestions/advice/lessons from experience for connecting this new block wall to the existing block wall (anchors to use, useful products, things to watch for)? The two walls will connect at the building corners.

I'm planning to reinforce the new cmu wall at 24" on center, but I'm unaware of the reinforcement in the existing block walls to remain (no existing drawings available).

Thank you for any feedback you can provide.

RE: Masonry Wall - Connecting new 8" cmu wall to existing 8" cmu wall

Put control joints in at those locations

RE: Masonry Wall - Connecting new 8" cmu wall to existing 8" cmu wall

Without more info I completely agree with hawkaz. Its easy to do and you won't have to worry about differential settlement issues with new footing settlement.

John Southard, M.S., P.E.

RE: Masonry Wall - Connecting new 8" cmu wall to existing 8" cmu wall

Yes, control joints are probably best solution to keep the two walls separated.

If you want to connect them together, use pieces of steel angle with epoxy anchors drilled into the CMU cells. the angle would need to have long enough legs to get anchors away from edges of CMU (say L8x8).

Another thing: you said you "don't know if the existing CMU walls are reinfored" - based on the description of work, the IBC Existing Building Chapter may require you to analyze the existing structure for compliance with current codes. If that is the case, you will need to justify how the existing CMU walls to remain work (for cladding loads, and maybe even as shearwalls if that is the Lateral Force Resisting System).

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


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

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