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Wall base depth

Discussion in 'Hardscaping' started by b landscaping, Mar 30, 2014.

  1. b landscaping

    b landscaping LawnSite Member
    Messages: 74

    Building a small wall for a customer. Area always is damp and customer said they are having settling problems for home foundation. I am thinking a 8" base would suffice and should be more than enough. Any other ideas would be great
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  2. alldayrj

    alldayrj LawnSite Gold Member
    Messages: 3,793

    Is the house new/newer? Might need to dig down and compact in lifts as you build back up along the foundation
     
  3. jmkr02

    jmkr02 LawnSite Senior Member
    Messages: 264

    Field stone, roll them in place. Otherwise dig down to virgin ground and buildup from there.
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  4. b landscaping

    b landscaping LawnSite Member
    Messages: 74

    House been there for twenty years. Just having problems with soil. I'll dig till I hit that good red clay then I will start up from there. I like the big stone idea too.
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  5. DVS Hardscaper

    DVS Hardscaper LawnSite Fanatic
    Messages: 6,601

    Not so fast.

    Before anything is done, you need to correct the water problem.

    Could be an underground stream. An if so you need to divert the water

    Could be a broken water line.

    Could be a roof water issue.

    Do not build a wall without first identifying and correcting the water issue.

    DO NOT.

    Next - base thickness needs to be speced by your engineer. Usually 6-inch depth is fine.
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  6. b landscaping

    b landscaping LawnSite Member
    Messages: 74

    We are running corrugated pipe from the gutter downspouts. Also regrade where was previously but not enough. We are adding additional base for more support for the wall. It is a three course wall and adding more drainage pipe and rocks then we usually do to the bottom
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  7. b landscaping

    b landscaping LawnSite Member
    Messages: 74

    Grade area sloping to wall which was graded before but not enough***
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  8. jmkr02

    jmkr02 LawnSite Senior Member
    Messages: 264

    20 years what does the foundation wall look like? People have been doing a lot of water proofing 3 ft of wall and adding a membrane graded to a french drain by us. It directs the water away from the house and gives it somewhere to go.
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  9. BossPlowMaster

    BossPlowMaster LawnSite Member
    Messages: 122

    Don't argue with DVS. He knows what he's talking about. If a house... A while house is shifting and settling. Your dinky wall will be way more seceptable. Fix the water issue. Trench in the down spouts. Fix the pitch of the yard for runnoff.
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  10. b landscaping

    b landscaping LawnSite Member
    Messages: 74

    Yes they had to have their addition jacked up from where added it onto back of house. Contractor shirt cuts I believe. Water is not a walls best friend:(((
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