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

Cutting an opening in a CMU wall

Cutting an opening in a CMU wall

Cutting an opening in a CMU wall

We are doing a remodel at our church that consists of cutting a large opening in a CMU load bearing wall. My question is in regards to supporting the bricks above the opening during demo before we set in our steel supporting beam and column.

Bricks are 6 1/8" wide and the wall is about 10' high. We would like the opening to be 7.5' tall x 16' wide.

What, if any, is the best way to support the bricks above the opening during demo?


RE: Cutting an opening in a CMU wall

It's a load-bearing wall. What has your contractor/engineer said about the "load" that needs to supported. It sounds like you're only asking about the bricks (the masonry) falling down into the new opening as if they were the problem.

Or are you describing the problem as if the entire wall might fail because the load remains, but the masonry are being removed?

RE: Cutting an opening in a CMU wall

Needle beams are one popular alternative. DIY church renovations are notorious for falling down during construction. Please do ensure that you have competent design and construction help if any of this is outside of your normal area of practice.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: Cutting an opening in a CMU wall

@racookpe1978: As far as the load goes, we will be able to support it because we have access to the joists. So my questions is definitely in regards to the masonry falling/collapsing from it's own weight as we demo the wall.

@KootK: Thanks for the comment about the church renovation fails! We are definitely discussing contracting this out to take care of this issue.

We've looked at and brainstormed quite a few options just wanted to have some more eyes on it.


RE: Cutting an opening in a CMU wall

hi first time post here you will need the structural eng calcs for the doads in KN this will allow you to design the tempoary works i would not space your needles any greater than 750mm apart but be aware acro props are only good for about 12 KN AND IF ANY THING WAS TO GO AMISS IF YOU DONT HAVE A DESINED TEMPOARY WORK AND INSUREANCE YOU ARE TAKEING A BIG RISK aslo i would lace an brace the props with scafold tubes fingers crossed and a prayer to god wont cut it lol oh and fit temp wooden boards between the steel needles to stop any loose brickwork falling down between the needles good luck mixgas

RE: Cutting an opening in a CMU wall

Note to self: never post drunk with caps lock engaged.

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