FHB Logo Facebook LinkedIn Email Pinterest Twitter Instagram Plus Icon Close Icon Navigation Search Icon Navigation Search Icon Arrow Down Icon Video Guide Icon Article Guide Icon Modal Close Icon Guide Search Icon Skip to content
Subscribe
Log In
  • How-To
  • Design
  • Tools & Materials
  • Videos
  • Blogs
  • Forum
  • Magazine
  • Members
  • FHB House
  • Podcast
Log In

Discussion Forum

Discussion Forum

Building a block wall on slab

AndyM457 | Posted in General Discussion on March 24, 2022 01:29pm

In my basement I am wanting to put a storm shelter.  It is a 4″ concrete slab, and under that is plastic underlayment and about 4 to 6″ of stone.   The ground underneath is pretty much solid sandstone.  I was wondering if I could put a concrete block wall on top of the slab,  if I would need to drill holes and drive in rebar, or if I would need to cut the concrete, dig out and pour other footers?  The edges of the slab rest on about 3 to 4″ of the footer.  I am only wanting a 7′ wall with a metal or concrete roof on it.   Any help would be appreciated.   I have not seen any evidence of settling problems in the basement.

Reply

Replies

  1. greg_e | Mar 24, 2022 03:58pm | #1

    I'm assuming a tornado shelter? A 4" Slab is just not enough to anchor anything substantial to. I would cut the slab and pour a footing (depending on the size of your shelter a thickened pad for the shelter might be the easiest way). I would build the walls like a concrete retaining wall. Also I would pour concrete instead of block. The block needs to be grouted anyway, so just build forms and pour concrete. I started construction building forms so I am likely biased in that regard. Good luck.

    1. bing0328 | Mar 24, 2022 05:31pm | #2

      In general I agree with Greg, but given what your trying to accomplish, talk to a structural engineer. If I was sitting in the shelter, I would want to know I did everything I could to protect my loved ones sitting next to me, while the world is trying to destroy me.

Log in or create an account to post a comment.

Sign up Log in

Become a member and get full access to FineHomebuilding.com

Video Shorts

Categories

  • Business
  • Code Questions
  • Construction Techniques
  • Energy, Heating & Insulation
  • General Discussion
  • Help/Work Wanted
  • Photo Gallery
  • Reader Classified
  • Tools for Home Building

Discussion Forum

Recent Posts and Replies

  • |
  • |
  • |
  • |
  • |
  • |
View More Create Post

Up Next

Video Shorts

Featured Story

Behind the Scenes of a Concrete Batch Plant

The batch plant is your partner in getting high-quality concrete on your job site.

Featured Video

Micro-Adjust Deck-Baluster Spacing for an Eye-Deceiving Layout

No math, no measuring—just a simple jig made from an elastic band is all you need to lay out a good-looking deck railing.

Related Stories

  • Podcast 548: PRO TALK With Design/Build Operations Manager Jessica Bishop-Smyser
  • Strategies for Venting a Roof Valley
  • Podcast 547: Basement Insulation, Historic Preservation Resources, and Shipping Container ADUs
  • Podcast 547: Members-only Aftershow—Fine Homebuilding House memories

Highlights

Fine Homebuilding All Access
Fine Homebuilding Podcast
Tool Tech
Plus, get an extra 20% off with code GIFT20

"I have learned so much thanks to the searchable articles on the FHB website. I can confidently say that I expect to be a life-long subscriber." - M.K.

Get home building tips, offers, and expert advice in your inbox

Signing you up...

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
See all newsletters
See all newsletters

BOOKS, DVDs, & MERCH

Shop the Store
  • Code Check Building 4th Edition
    Buy Now
  • Pretty Good House
    Buy Now
  • 2023 Tool Guide
    Buy Now
  • 2022 Fine Homebuilding Archive
    Buy Now
  • Shop the Store

Fine Homebuilding Magazine

  • Issue 314 - April/May 2023
    • 7 Options for Countertops
    • Tool Test: Wood-Boring Bits
    • Critical Details for Ductless Heat Pumps
  • Issue 313 - Feb/March 2023
    • Practical System for a Seismic Retrofit
    • Fine Homebuilding Issue #313 Online Highlights
    • Practical System for a Seismic Retrofit
  • Issue 312 - Dec 2022/Jan 2023
    • Tool Test: Cordless Tablesaws
    • Gray-Water System for a Sustainable Home
    • Insulate a Cape Roof to Avoid Ice Dams
  • Issue 311 - November 2022
    • 7 Steps to a Perfect Exterior Paint Job
    • Options for Smarter Home-Energy Tracking
    • The Fine Homebuilding Interview: James Metoyer
  • Issue 310 - October 2022
    • Choosing a Tile-Leveling System
    • Choosing Between HRVs and ERVs
    • Custom Built-in Cabinets Made Easy

Fine Homebuilding

Follow

  • twitter
  • facebook
  • instagram
  • pinterest

Newsletter

Get home building tips, offers, and expert advice in your inbox

Signing you up...

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
See all newsletters
See all newsletters

Membership & Magazine

  • Online Archive
  • Start Free Trial
  • Magazine Subscription
  • Magazine Renewal
  • Gift a Subscription
  • Customer Support
  • Privacy Preferences

Taunton Network

  • Green Building Advisor
  • Fine Woodworking
  • Fine Gardening
  • Threads
  • About
  • Contact
  • Advertise
  • Careers
  • Copyright
  • Terms of Use
  • Site Map
  • Do not sell or share my information
  • Privacy Policy
  • Accessibility
  • California Privacy Rights

© 2023 The Taunton Press, Inc. All rights reserved.

X
X
This is a dialog window which overlays the main content of the page. The modal window is a 'site map' of the most critical areas of the site. Pressing the Escape (ESC) button will close the modal and bring you back to where you were on the page.

Main Menu

  • How-To
  • Design
  • Tools & Materials
  • Video
  • Blogs
  • Forum
  • Reader Projects
  • Magazine
  • Members
  • FHB House

Podcasts

  • FHB Podcast
  • ProTalk

Webinars

  • Upcoming and On-Demand

Podcasts

  • FHB Podcast
  • ProTalk

Webinars

  • Upcoming and On-Demand

Popular Topics

  • Kitchens
  • Business
  • Bedrooms
  • Roofs
  • Architecture and Design
  • Green Building
  • Decks
  • Framing
  • Safety
  • Remodeling
  • Bathrooms
  • Windows
  • Tilework
  • Ceilings
  • HVAC

Magazine

  • Current Issue
  • Past Issues
  • Magazine Index
  • Subscribe
  • Online Archive
  • Author Guidelines

All Access

  • Member Home
  • Start Free Trial
  • Gift Membership

Shop the Store

  • Books
  • DVDs
  • Taunton Workshops

More

  • FHB Ambassadors
  • Reader Projects
  • Podcast
  • FHB House
  • Customer Support

Account

  • Log In
  • Join

Newsletter

Get home building tips, offers, and expert advice in your inbox

Signing you up...

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
See all newsletters
See all newsletters

Follow

  • twitter
  • facebook
  • instagram
  • pinterest

Join All Access

Become a member and get instant access to thousands of videos, how-tos, tool reviews, and design features.

Start Your Free Trial

Subscribe

FHB Magazine

Start your subscription today and save up to 70%

Subscribe

We hope you’ve enjoyed your free articles. To keep reading, become a member today.

Get complete site access to expert advice, how-to videos, Code Check, and more, plus the print magazine.

Start your FREE trial

Already a member? Log in