Boundary wall foundation and shed foundation.

robertxxx

Hi all,

I'm looking to build a block shed, if I'm building close to the boundary is there a risk of the boundary wall falling down when I dig the shed foundation, due to small garden I want to build as close as possible.

The boundary wall is about 7 foot high and 22feet wide, and its there for the last 11 years.

Robbie.G

robertxxx wrote: »

Hi all,

I'm looking to build a block shed, if I'm building close to the boundary is there a risk of the boundary wall falling down when I dig the shed foundation, due to small garden I want to build as close as possible.

The boundary wall is about 7 foot high and 22feet wide, and its there for the last 11 years.

It's very hard to tell without knowing what the foundations on the wall are like.
If you dig down to the found and expose a section of it say 12-18 inches long see how deep found is down and how thick it is.
If you feel its week dig down as discribed and under the wall found in small sections and underpin it by back filling with concrete letting it go under the wall found and that will strengthen up the lot but you can only do that in small sections say 1 mtr skip 2 mtrs then dig another 1 mtr it will take a few days to do the found that way

sky6

I done a similar job for the Daughter a while ago.

It really depends on how good the foundation is which is hard to determine without various tests.
Try digging one or two trial holes to assess how deep the concrete is. It should be 225 to 300 deep and a metre wide.
If the Wall has been there for 11 years without any cracks then its probably ok.
You could also brace it with a few timbers so as it doesn't fall on you.
I would however dig the foundation out and pour concrete on the same day. Best practice would be to pour the new Concrete up against the Wall foundation and not leave a strip of soil between them.
Needless to say proceed with caution and make sure there are no children around while working on the foundation.

gutteruu

I am almost finishing a garage that is in identical situation. I didn't want to chance it so built 3 block walls and put a steel cladding wall up almost to neighbours garden wall, resting on its foundation. 2 pillars at open block ends and RSJ across. Saved me 3 or 4 feet of garden space also.

robertxxx

gutteruu wrote: »

I am almost finishing a garage that is in identical situation. I didn't want to chance it so built 3 block walls and put a steel cladding wall up almost to neighbours garden wall, resting on its foundation. 2 pillars at open block ends and RSJ across. Saved me 3 or 4 feet of garden space also.

Can you post a picture of what you've done as I can't picture it.

gutteruu

You can pause these by clicking near bottom right corner

First batch

Random

Another view



Had these done up already. Not a lot of pics of steel wall, but you can see i just put 4 courses of footings onto foundation of neighbours wall. Then I just built 3 walls and wall that goes against neighbours wall is a steel clad wall. (Big RSJ is just to support roof as I didn't want any weight on the steel clad wall.)

robertxxx

Cheers, that's cleared it up for me, looks very good.

sky6

Looks a fine job and nice piece of Steelwork also. Somewhere nice to go when you're in the dog house .
I'm sure she's so proud of you. Well Done.

gutteruu

sky6 wrote: »

Looks a fine job and nice piece of Steelwork also. Somewhere nice to go when you're in the dog house .
I'm sure she's so proud of you. Well Done.

Thanks. I just put doors in yesterday and had to explain to her the doors only came with 1 key that can't be copied