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

Best practices

Best practices

Best practices

I'm demolishing an existing, derelict 3-story brownstone in a residential/industrial area of Brooklyn and building a five-story residential building in its place.  The building shares a party wall on one side with a building of similar size.  The other side is directly adjacent to a 60' four-story building.  The lot is 20' wide.

A contractor has suggested that, rather than demolishing/underpinning/foundation/steel as a 4-step process by separate trades that we leave up the existing structure and do these tasks under and around the existing structure saving the demo for later.  He suggests this so that the water and power remain, the need for scaffolding is reduced and the effect on the neighbors is masked and kept to a minimum.

Since my experience is limited to wood-frame single family construction, I'm wondering how sound this plan is.

Coincidentally, I could also use some recommendations on expereience trades in the area since all my connections are several counties north and trades won't travel.


RE: Best practices

You won't have any trouble find any needed trade. Keep in mind the unions are still very strong. A lot of demo work is done non-union. Sometimes they're harassed.

One word of caution about working in the city - if you don't know how "things" work you might be asking for trouble.

RE: Best practices

This sounds very similar to a project I did.

The critical issue is that at each and every stage the building is stable. This can be best achieved by getting the stabilising members (such as shear walls e.t.c.) up as soon as possible and then demolishing the existing structure around it.

Economy can often be best achieved by using your temporary bracing as part of the permanent structure. This requires agreat deal of coordination and lateral thinking, but it can really be worth it.

Keep in mind that the floor membranes in this type of building are crucial to the stability, and removing any part of them can cause stability issues that need to be addressed.

For our design, we actually provided a demolition drawing giving the stages of construction and location of temporary/permanent props. You need to at least do this for yourself to make sure it works as you plan it.

To what extent are you underpinning the existing walls?
What type of construction are you proposing?

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