Lowering ground level with trench - how wide?


Postby peelypost » Tue Sep 22, 2009 3:15 pm

Hi,

We need to lower external ground levels to below DPC and have been advised that we need a good 800mm width excavation. Does it really need to be this wide? I can't see how 800mm will be any more effective than 400mm with a grate on top.

What do you think?

Thanks,

N
peelypost
Rank: Labourer
Progress to next rank:
25%
Posts: 2
Joined: Tue Sep 22, 2009 3:10 pm

Sponsor

Simply Build It

Postby Perry525 » Wed Sep 23, 2009 5:38 pm

Its simple really, the idea behind lowering the ground outside, is that heavy rain bounces, depending on your location and how exposed you are, the rain will bounce and make the wall wet above the dpc.
The recommended level is six inches below the dpc, the width whatever you like, if your guess is wrong you can always deepen or widen the hole. (or both) I find that having pea shingle in the hole stops the rain from bouncing.
Perry525
Rank: Site Agent
Progress to next rank:
46.6%
Posts: 733
Joined: Fri Jul 06, 2007 7:35 pm

Postby peelypost » Thu Sep 24, 2009 9:40 am

That explains it - thanks. I was thinking of hydrostatic pressures and just needing to break the ground contact - hadn't thought of the rain splash.

Pretty obvious really!

:D
peelypost
Rank: Labourer
Progress to next rank:
25%
Posts: 2
Joined: Tue Sep 22, 2009 3:10 pm

Display posts from previous
Sort by
Order by



  • DIY How to Project Guides

  • DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!



 


  • Related Topics