Free standing garden wall and support pillars?

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My next door neighbour has a contractor in building him a very long (20m plus) 2m high garden wall from 100mm blocks.

I'm a bit concerned that he doesn't seem to be putting *any* support pillars in place. I thought that this would be a requirement?

I'm not wanting to cause any trouble but equally so, I don't want him building something that's going to be unsafe, especially considering that one run is up against our boundary.

Can anyone advise what standard practice should be, please?
 
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Is it 1 block (100mm) thick or two blocks (200mm) thick?
Either way it's unsafe.
All the 'contractor' needs to do is to incorporate a dpc near ground level, whereby the wall's fate is sealed.
 
It's 1 100mm block in width. As for wind direction; it's a three sided wall, so the length of each span (20m plus) is so long that I don't think it's going to get adequate support from the corners and at least one section is going to get the full on prevailing winds.

Are there building regs that cover this? Is there anything I can do?
 
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Common practice would mean a bonded pier of some sort every 3m or so. There are options for mortar bed reinforcement, but there should certainly be some piers in a 20m wall. Are they hanging ties out on the other side of the wall that you can't see?

Also it needs expansion joints every 6-10m, if not the wall will crack vertically and then form unbonded panels more liable to be blown over.

There are no building regulations for garden walls. The Party Wall Act may apply, and that could be used to specify a suitable wall design.

Have you spoken with the neighbour? He may not know anything about the wall design and if he has just selected crap builders, they wont either, so the neighbour may be none the wiser.
 
Thanks for the replies, all.

I went around and spoke to the main contractor this morning. They are indeed putting pillars in; they're on the other side that's not visible to me, as woody suggested may the the case. They're also doing expansion joints.

Thanks for the feedback and advice, all. I should probably have gone and spoken to them first off, but not being a builder/expert I wanted to get an idea of what I was talking about, hence the post. Thanks again for the help.
 

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