Welcome to Koi Forum. Is this your first visit? Register
Results 1 to 13 of 13
  1. #1
    Member Rank = Nisai Gnmm's Avatar
    Join Date
    Oct 2020
    Location
    South Cheshire
    Posts
    58
    Thanks / Likes
    48

    Any builders / landscapers out there?

    Desperate for some advice please
    We decided to build our own patio after most of the old one was demolished to have the new conservatory built. The trouble is the land is not even and it slopes away from the house in places. This would mean that we will have to build a small retaining wall approximately 200- 300 mm to keep the new patio at the required fall.

    My question is what sort of foundation would the retaining wall need? Can I just build up on a layer of MOT after digging to subgrade? Do we need to dig a trench and fill it with concrete? Do we need to use rebar?

    Of note, this area of the garden can get quite sodden in heavy rain. We are not worried about run off from the surface of the patio though as there would be a linear drain connected io surface water pipes before the edge of the patio.

    Advice is greatly appreciated as always.



  2. #2
    Senior Member Rank = Yonsai Big nige's Avatar
    Join Date
    Nov 2020
    Location
    Poole, doset
    Posts
    242
    Thanks / Likes
    458
    No you can't just build of type 1. For a retaining wall 300mm highx215mm wide a footing of 150 mm deep X 350mm (minimum) will be enough.
    You don't need rebar but you will need to leave open perp joints ( the vertical ones) every 900mm along the base of the wall at lowest ground level to allow any water behind the wall to escape.

    Sent from my moto e6 play using Tapatalk

  3. Thanks Ajm, dbs Thanked / Liked this Post
  4. #3
    Member Rank = Nisai Gnmm's Avatar
    Join Date
    Oct 2020
    Location
    South Cheshire
    Posts
    58
    Thanks / Likes
    48
    Thank you. So I suppose it would be easier to dig the foundation trench before removing the turf from the remaining area of the patio? Do I need to have a layer of gravel at the bottom of the trench?
    Also I have a load or engineering bricks lying around. Am I ok to use those or does it have to be concrete blocks? And if so will it need to be single or double skinned?
    Sorry about all the questions. I want to do this right the first time.

  5. #4
    Senior Member Rank = Yonsai Big nige's Avatar
    Join Date
    Nov 2020
    Location
    Poole, doset
    Posts
    242
    Thanks / Likes
    458
    Questions not a problem, no gravel in base of trench but a firm natural base is needed, so if you can walk in the trench leaving slight footprints is ok. yes engineering bricks are good and yes it needs to be double skin. English or Flemish bond is best ( Google those bonds) but if you are doing it yourself and don't feel confident with either bond you could just build 2 skins back to back using wall ties to link together 1 row on top of first course of bricks at 900mm spacing and 1 row under the last course of bricks. The important thing with retaining walls is to make sure your perp joints are full to give wall strength, other than the weep holes left empty to allow water to escape

    Sent from my moto e6 play using Tapatalk
    Last edited by Big nige; 29-04-2021 at 03:54 PM.

  6. Thanks Gnmm, dbs Thanked / Liked this Post
  7. #5
    Member Rank = Nisai Gnmm's Avatar
    Join Date
    Oct 2020
    Location
    South Cheshire
    Posts
    58
    Thanks / Likes
    48
    Really can't thank you enough. After a quick Google search, I discovered that the bricks I have are only facing bricks. I had those for many years stored at the side of the garage and it would be great if I could use them. Would they be any good or do I still have to buy engineering bricks?

  8. Thanks Big nige Thanked / Liked this Post
  9. #6
    Senior Member Rank = Yonsai Big nige's Avatar
    Join Date
    Nov 2020
    Location
    Poole, doset
    Posts
    242
    Thanks / Likes
    458
    Face bricks are absolutely fine to use.
    No thanks needed it's a case of each to their own, 40 years in the building but crap at other stuff lol

    Sent from my moto e6 play using Tapatalk
    Last edited by Big nige; 29-04-2021 at 04:52 PM.

  10. Thanks Ajm, Gnmm Thanked / Liked this Post
  11. #7
    Senior Member Rank = Supreme Champion Ajm's Avatar
    Join Date
    Mar 2018
    Location
    Durham
    Posts
    6,941
    Thanks / Likes
    14267
    Quote Originally Posted by Big nige View Post
    Face bricks are absolutely fine to use.
    No thanks needed it's a case of each to their own, 40 years in the building but crap at other stuff lol

    Sent from my moto e6 play using Tapatalk
    Lol haha brill

    Sent from my F5121 using Tapatalk
    Johnathan

  12. Thanks Big nige Thanked / Liked this Post
  13. #8
    Senior Member Rank = Yonsai Big nige's Avatar
    Join Date
    Nov 2020
    Location
    Poole, doset
    Posts
    242
    Thanks / Likes
    458
    Quote Originally Posted by Ajm View Post
    Lol haha brill

    Sent from my F5121 using Tapatalk
    Seriously AJ if you saw the mess I can make with a chainsaw you would cry laughing, even my fish look at me with that " are you sure you know what your doing" expression most of the time. Any builders / landscapers out there?Any builders / landscapers out there?Any builders / landscapers out there?

    Sent from my moto e6 play using Tapatalk
    Last edited by Big nige; 29-04-2021 at 05:02 PM.

  14. Thanks Ajm, dbs Thanked / Liked this Post
  15. #9
    Senior Member Rank = Supreme Champion Ajm's Avatar
    Join Date
    Mar 2018
    Location
    Durham
    Posts
    6,941
    Thanks / Likes
    14267
    Quote Originally Posted by Big nige View Post
    Seriously AJ if you saw the mess I can make with a chainsaw you would cry laughing, even my fish look at me with that " are you sure you know what your doing" expression most of the time. Any builders / landscapers out there?Any builders / landscapers out there?Any builders / landscapers out there?

    Sent from my moto e6 play using Tapatalk
    Am crying here just thinking about it lol

    Sent from my F5121 using Tapatalk
    Johnathan

  16. Thanks Big nige Thanked / Liked this Post
  17. #10
    Member Rank = Nisai Gnmm's Avatar
    Join Date
    Oct 2020
    Location
    South Cheshire
    Posts
    58
    Thanks / Likes
    48
    How about levels? The bit of land that the retaining wall will go on has different levels and is uneven. Any tips on how to make the final footings level throughout?

  18. #11
    Senior Member Rank = Yonsai Big nige's Avatar
    Join Date
    Nov 2020
    Location
    Poole, doset
    Posts
    242
    Thanks / Likes
    458
    You can put steps in the footing 75mm high or 150mm high which is 1 or 2 courses of brick, where the step is the concrete will obviously be double depth to maintain its linear strength and tie the whole footing as a mass

    Sent from my moto e6 play using Tapatalk

  19. Thanks Gnmm Thanked / Liked this Post
  20. #12
    Senior Member Rank = Yonsai Big nige's Avatar
    Join Date
    Nov 2020
    Location
    Poole, doset
    Posts
    242
    Thanks / Likes
    458
    Ignore the actual dimensions on the drawing but this should explain it betterelevation-stepped-foundation-diagram.jpg

    Sent from my moto e6 play using Tapatalk
    Last edited by Big nige; 30-04-2021 at 07:46 AM.

  21. Thanks Ajm, Gnmm, dbs Thanked / Liked this Post
  22. #13
    Member Rank = Nisai Gnmm's Avatar
    Join Date
    Oct 2020
    Location
    South Cheshire
    Posts
    58
    Thanks / Likes
    48
    This is really useful. But how do you decide where to place the step when digging? Sorry if this is a stupid question.

 

 

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
All times are GMT +1. The time now is 07:52 AM. Online Koi Mag Forum
Powered by vBulletin® Version 4.2.3
Copyright © 2021 vBulletin Solutions, Inc. All rights reserved.

vBulletin Improved By vBFoster® (Lite Version), © UltimateScheme, Ltd.