smart51
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| posted on 23/10/15 at 10:02 PM |
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digging out a basement
We looked at a new house today which is built on a hill. At the front, there is a built in garage at ground level, with steps up to the door at the
side. The ground at the side and the back is at "1st floor" level.
The garage only extends 2/3 of the way back in the house, which made me think. How hard would it be to have the back dug out? And as the garage is
not the full width, the side as well? It's easy enough for builders to put in RSJs and cut doorways into the walls. Is it feasible to dig out
a store room and a tool room in the space around the garage?
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slingshot2000
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| posted on 23/10/15 at 10:46 PM |
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Should be easy, as long as you can sign very large cheques !
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Ben_Copeland
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| posted on 24/10/15 at 04:49 AM |
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Big consideration would be foundations and floor structure.
Ben
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David Jenkins
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| posted on 24/10/15 at 06:51 AM |
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Next consideration will be damp-proofing. There should be some there already (hopefully) that you would have to break into, then you've have to
link it up with the new proofing. Not trivial.
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jossey
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| posted on 24/10/15 at 08:00 AM |
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The new house we have just got has that and the back wall is 4ft thick to hold the wall and house up. If it only goes that far back I suspect it was
not the owners thinking let's have a smaller garage but more let's not have the house collapse 
Get the plans and technical drawings and the calulations the back wall will have a lot of lateral pressure from the outside
Thanks
David Johnson
Building my tiger avon slowly but surely.
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smart51
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| posted on 24/10/15 at 08:08 AM |
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The house was built around 1970, so will be of fairly modern construction. There is a thick mortar line between the top of the garage and the ground
floor, which I suspect is the DPC. There's no sign of damp in the garage front to back or top to bottom, though it may be that all the walls
are against voids (and next doors garage).
So I guess the worst case is that the new spaces might need to be tanked, at a cost of several thousand.
Here's an odd alternative. Would it be cheaper to dig new footings about half a metre in from the existing and build a new, separate wall and
floor with a separate DPC?
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smart51
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| posted on 24/10/15 at 08:30 AM |
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quote:
Originally posted by jossey
The new house we have just got has that and the back wall is 4ft thick to hold the wall and house up. If it only goes that far back I suspect it was
not the owners thinking let's have a smaller garage but more let's not have the house collapse
Get the plans and technical drawings and the calulations the back wall will have a lot of lateral pressure from the outside
The garage on the house we looked at is under the front room and stair well. There is the whole of the back room to open up, less any super thick
wall of course. I wouldn't want to alter the structure of the house at all, save for putting doorways in.
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kenton
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| posted on 24/10/15 at 03:53 PM |
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I,m in the process of doing this, about to go away but will post up pics on my return.
Dug out under house going back into hill. went as far as the base of the original foundations. new strip foundation with a new skin wall within the
old one.
Must go now..
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kenton
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| posted on 2/11/15 at 06:43 PM |
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During excavation.
 [/URL
[URL=http://s1180.photobucket.com/user/southernkitcarclub/media/Kentons/IMG_0258%20Small.jpg.html]
As of today
[Edited on 2/11/15 by kenton]
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smart51
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| posted on 2/11/15 at 07:03 PM |
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Cool! I take it the original depth was where the block work changes.
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kenton
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| posted on 2/11/15 at 07:27 PM |
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Yes, about halfway up you can see the damp course.
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steve m
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| posted on 3/11/15 at 10:05 AM |
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Is this the new SKCC clubhouse ?
looks great, and wish I had a void under my house like that !!
steve m
Thats was probably spelt wrong, or had some grammer, that the "grammer police have to have a moan at
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tegwin
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| posted on 3/11/15 at 01:08 PM |
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There was a documentary not so long ago about people doing just this in London... Causing chaos for everyone else around them due to the heavy
machinery required.
In some cases they were going 2 storeys down... an interesting feat when most of them were mid terraces! Some pretty nasty horror stories too.. I
guess its easier in London as its all gravel/sand.. If you live on solid granite it might be harder!
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[/URL 
