wall

Discussion in 'Landscape Architecture and Design' started by randy2625, May 2, 2004.

  1. randy2625

    randy2625 LawnSite Member
    Posts: 114

    i have this house that needs 5 terraced sections of retaining wall blocks each on 5 feet high do i need to put drain tile in or can i just put gravel behind it to keep pressure off it.
     
  2. capital

    capital LawnSite Member
    Posts: 118

    Suggest you forget about building this wall if you are asking the above question. Hire someone who knows what they are doing and learn from them and start on a smaller wall to gain experience.
     
  3. randy2625

    randy2625 LawnSite Member
    Posts: 114

    i have done smaller walls but not a bigger wall like this thats what im trying to do is learn im not gonig to pass a job up worth this much money.
     
  4. D Felix

    D Felix LawnSite Bronze Member
    Posts: 1,898

    It's not worth much if you don't know what you are doing.

    There's a big difference between building a wall that's 2' high versus 5' high.

    Do a little searching and see what you find. I agree with capital, hire a sub to build them, mark up what they charge so you make a little money, and learn from them.

    We are going to be preparing a bid soon to remove and replace 2 three-year-old walls that were not installed correctly... Rough guess before we get into it, is that it's going to be in the nieghborhood of $30k.... And the company that put it in will be cussed the entire time, not only by us, but the homeowner.

    Remember, bad reputations last a long time in this business....

    And explain why you think simply putting gravel behind the wall would be adequate....


    Dan
     
  5. randy2625

    randy2625 LawnSite Member
    Posts: 114

    im not sure that it would be adequate tahts what im trying to find out. i know it is a big job but if i take my time and do it right then i will have no worrys. i have been reading for the last couple of days. i know it will probley have to have drain tile because we get so much rain here im just trying to figure out how im going to run it all. and it probley will need a support system since it is abve 4'.
     
  6. ckf

    ckf LawnSite Member
    Posts: 26

    Your also going to need an engineer to design the wall system since it is over 4' tall which is going to cost some bucks to begin with. I agree with the other posts to either let some one who knows what they are doing do it or sub it out to someone who does and make a little profit off of them as well as learning how to do it. If you have never done one like this before, you are asking for a lawsuit from the owner of the property. When using a "support system", as you put, it involves a lot more than just laying out the fabric. For instance, do you know which way the pattern in the geo textile fabric is supposed to be layed out? If not, DO NOT DO THIS JOB. You will be asking for trouble if you do. I am not tryong to be harsh but rather trying to save you from a ton of headaches.
     
  7. randy2625

    randy2625 LawnSite Member
    Posts: 114

    well then why dont i just make the wall 4' high and solve all the problems since it is not over ...
     
  8. creativedan

    creativedan LawnSite Member
    from IL
    Posts: 54

    why does an engineer have to design the wall?? just curious or is that local ordinance or something?
     
  9. ckf

    ckf LawnSite Member
    Posts: 26

    This is what I was/am going by


    "i have this house that needs 5 terraced sections of retaining wall blocks each on 5 feet high do i need to put drain tile in or can i just put gravel behind it to keep pressure off it."

    I have a few questions for you before I call it a night and check back tomorrow

    1) If you change the wall height from 5' to 4', do you have enough room to allow for proper set back of each wall?

    2)Can you change the wall heights without drastically changing what was trying to be accomplished in the first place?

    3)What does your state and local codes allow for before being required to use geo-grid/engineer?

    4)Regardless of how high each wall is, have you planned far enough ahead to know how you are going to create the benches to work off of to create the walls?

    5)Do you have station marks to know where to set the base course heights?

    6)With that many terraces/walls, where are you going to empty the drain pipes/stone into?

    7) Why wouldn't you put a drain pipe behind any wall regardless of how tall it is? Hydrostatic pressure can be huge!
     
  10. ckf

    ckf LawnSite Member
    Posts: 26

    creativedan,

    Almost every manufacturer of retaining wall block requires that you use an engineered wall system after a certain height. Some systems call for them after 3' in height. It all has to do with what loads their wall systems can handle before backfill and stabilization fabric/material needs to be addressed. There is a lot more to it than that but it would take up too much room
     

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