Footings for 2nd floor extension?
Discussion
Hi chaps,
We are currently having some of our ground floor dug up to re-do the subfloor (with insulantion, DPM etc - proper job) before putting a new concrete floor in, then wood on top.
While we are there I thought I would investigate the depth of our footings on the original part of the house, where we would need to run a steel from, to join up with the wall of an extension, so that we know whether the footings are deap enough to take the load of a 2nd floor.
Anyone know how deep I should be looking for these to be? I will get a structural engineer in to inspect it once I have dug down, but interested to hear how far I will have to dig tonight!
Cheers
Rich
We are currently having some of our ground floor dug up to re-do the subfloor (with insulantion, DPM etc - proper job) before putting a new concrete floor in, then wood on top.
While we are there I thought I would investigate the depth of our footings on the original part of the house, where we would need to run a steel from, to join up with the wall of an extension, so that we know whether the footings are deap enough to take the load of a 2nd floor.
Anyone know how deep I should be looking for these to be? I will get a structural engineer in to inspect it once I have dug down, but interested to hear how far I will have to dig tonight!
Cheers
Rich
Minimum of 450mm below ground level to avoid frost. Maybe a bit deeper to find good ground and if that was a long way down then mass concrete fill would normally be used to bring the strip footing back up to a reasonable level.
The ability of them to take the load from an additional floor is not so much down to how deep they are, more how wide and also how good the ground is.
The ability of them to take the load from an additional floor is not so much down to how deep they are, more how wide and also how good the ground is.
Thanks guys. We have dug down and found them to be about 1100mm deap (will check the width when I get in, but is at least 300mm), so hopefully that will be enough.
Structural engineer is coming Wednesday morning to assess it for me, so we can take any further action while we are there.
Thanks again.
Rich
Structural engineer is coming Wednesday morning to assess it for me, so we can take any further action while we are there.
Thanks again.
Rich
As stated above they need to be typically 450mm below ground level for frost susceptibility.
The depth only becomes a concern with foundations in clay soils with nearby trees as the ground can shrink/ expand.
You should be fine with regards to depth, if you're supporting a beam you may have to locally widen the foundatio depending on the load
The depth only becomes a concern with foundations in clay soils with nearby trees as the ground can shrink/ expand.
You should be fine with regards to depth, if you're supporting a beam you may have to locally widen the foundatio depending on the load
Yep. You can't build within 600mm of a manhole.
Strangely neither my builder nor my architect had heard of this (even though this rule has been in place for a loooooooong time
)
btw, the manhole wasn't just for this house, it served a number of neighbour's houses as well.
Strangely neither my builder nor my architect had heard of this (even though this rule has been in place for a loooooooong time
)btw, the manhole wasn't just for this house, it served a number of neighbour's houses as well.
Edited by pikey on Wednesday 30th September 09:39
We built single storey and dug down just over 1000....
....then building control noticed a 6 foot conifer in next doors garden and told us to go 2 metres along that side!
above sheet of ply is 8x4 for perspective
..and stepped back to 1000 for the return...
Conifer has since been cut down
....then building control noticed a 6 foot conifer in next doors garden and told us to go 2 metres along that side!
above sheet of ply is 8x4 for perspective
..and stepped back to 1000 for the return...
Conifer has since been cut down
pikey said:
Yep. You can't build within 600mm of a manhole.
Strangely neither my builder nor my architect had heard of this (even though this rule has been in place for a loooooooong time )
btw, the manhole wasn't just for this house, it served a number of neighbour's houses as well.
Yes you can...with the correct pipe protection....I'm not sure who told you that but it's bStrangely neither my builder nor my architect had heard of this (even though this rule has been in place for a loooooooong time
)btw, the manhole wasn't just for this house, it served a number of neighbour's houses as well.
Edited by pikey on Wednesday 30th September 09:39
ks.jules_s said:
pikey said:
Yep. You can't build within 600mm of a manhole.
Strangely neither my builder nor my architect had heard of this (even though this rule has been in place for a loooooooong time )
btw, the manhole wasn't just for this house, it served a number of neighbour's houses as well.
Yes you can...with the correct pipe protection....I'm not sure who told you that but it's bStrangely neither my builder nor my architect had heard of this (even though this rule has been in place for a loooooooong time
)btw, the manhole wasn't just for this house, it served a number of neighbour's houses as well.
Edited by pikey on Wednesday 30th September 09:39
ks.jules_s said:
pikey said:
Yep. You can't build within 600mm of a manhole.
Strangely neither my builder nor my architect had heard of this (even though this rule has been in place for a loooooooong time )
btw, the manhole wasn't just for this house, it served a number of neighbour's houses as well.
Yes you can...with the correct pipe protection....I'm not sure who told you that but it's bStrangely neither my builder nor my architect had heard of this (even though this rule has been in place for a loooooooong time
)btw, the manhole wasn't just for this house, it served a number of neighbour's houses as well.
ks.Greenwich council's building control inspector identified it as a Class II public sewer and advised he needed authorisation from Thames Water to sign that element off.
Thames water required a formal application to build close to a public sewer. This, accompanied with a £600 cheque, includes correspondence, inspections, CCTV scans before and after and confirming the drawings are correct. With my works they advised that they required 600mm clearance and required drawings to show that the foundations were 600mm clear, as well as the pipes that fed into it were 600mm clear to the sides and on top (with shingle in between).
A Thames Water guide to these works is here http://www.thameswater.co.uk/cps/rde/xbcr/corp/bui...
The Thames Water application form is here http://www.thameswater.co.uk/cps/rde/xbcr/corp/bui...
eps said:
+1
Not being funny but in your profile you say you're an architectural and planning professional so how is it someone in that career wouldn't know about this issue?Neither my architect or builder spotted this and hence I incurred a 6 week delay. The building control inspector said this isn't anything new and was surprised it hadn't been highlighted to me.
pikey said:
eps said:
+1
Not being funny but in your profile you say you're an architectural and planning professional so how is it someone in that career wouldn't know about this issue?Neither my architect or builder spotted this and hence I incurred a 6 week delay. The building control inspector said this isn't anything new and was surprised it hadn't been highlighted to me.
pikey said:
jules_s said:
pikey said:
Yep. You can't build within 600mm of a manhole.
Strangely neither my builder nor my architect had heard of this (even though this rule has been in place for a loooooooong time )
btw, the manhole wasn't just for this house, it served a number of neighbour's houses as well.
Yes you can...with the correct pipe protection....I'm not sure who told you that but it's bStrangely neither my builder nor my architect had heard of this (even though this rule has been in place for a loooooooong time
)btw, the manhole wasn't just for this house, it served a number of neighbour's houses as well.
ks.Greenwich council's building control inspector identified it as a Class II public sewer and advised he needed authorisation from Thames Water to sign that element off.
Thames water required a formal application to build close to a public sewer. This, accompanied with a £600 cheque, includes correspondence, inspections, CCTV scans before and after and confirming the drawings are correct. With my works they advised that they required 600mm clearance and required drawings to show that the foundations were 600mm clear, as well as the pipes that fed into it were 600mm clear to the sides and on top (with shingle in between).
A Thames Water guide to these works is here http://www.thameswater.co.uk/cps/rde/xbcr/corp/bui...
The Thames Water application form is here http://www.thameswater.co.uk/cps/rde/xbcr/corp/bui...
eps said:
pikey said:
jules_s said:
pikey said:
Yep. You can't build within 600mm of a manhole.
Strangely neither my builder nor my architect had heard of this (even though this rule has been in place for a loooooooong time )
btw, the manhole wasn't just for this house, it served a number of neighbour's houses as well.
Yes you can...with the correct pipe protection....I'm not sure who told you that but it's bStrangely neither my builder nor my architect had heard of this (even though this rule has been in place for a loooooooong time
)btw, the manhole wasn't just for this house, it served a number of neighbour's houses as well.
ks.Greenwich council's building control inspector identified it as a Class II public sewer and advised he needed authorisation from Thames Water to sign that element off.
Thames water required a formal application to build close to a public sewer. This, accompanied with a £600 cheque, includes correspondence, inspections, CCTV scans before and after and confirming the drawings are correct. With my works they advised that they required 600mm clearance and required drawings to show that the foundations were 600mm clear, as well as the pipes that fed into it were 600mm clear to the sides and on top (with shingle in between).
A Thames Water guide to these works is here http://www.thameswater.co.uk/cps/rde/xbcr/corp/bui...
The Thames Water application form is here http://www.thameswater.co.uk/cps/rde/xbcr/corp/bui...
pikey said:
the manhole wasn't just for this house, it served a number of neighbour's houses as well.
Even if it was a class I / only served my house I still would have had to submit an application to build near it.pikey said:
eps said:
pikey said:
jules_s said:
pikey said:
Yep. You can't build within 600mm of a manhole.
Strangely neither my builder nor my architect had heard of this (even though this rule has been in place for a loooooooong time )
btw, the manhole wasn't just for this house, it served a number of neighbour's houses as well.
Yes you can...with the correct pipe protection....I'm not sure who told you that but it's bStrangely neither my builder nor my architect had heard of this (even though this rule has been in place for a loooooooong time
)btw, the manhole wasn't just for this house, it served a number of neighbour's houses as well.
ks.Greenwich council's building control inspector identified it as a Class II public sewer and advised he needed authorisation from Thames Water to sign that element off.
Thames water required a formal application to build close to a public sewer. This, accompanied with a £600 cheque, includes correspondence, inspections, CCTV scans before and after and confirming the drawings are correct. With my works they advised that they required 600mm clearance and required drawings to show that the foundations were 600mm clear, as well as the pipes that fed into it were 600mm clear to the sides and on top (with shingle in between).
A Thames Water guide to these works is here http://www.thameswater.co.uk/cps/rde/xbcr/corp/bui...
The Thames Water application form is here http://www.thameswater.co.uk/cps/rde/xbcr/corp/bui...
pikey said:
the manhole wasn't just for this house, it served a number of neighbour's houses as well.
Even if it was a class I / only served my house I still would have had to submit an application to build near it.I was referring to your original post, not the later one, apologies as I missed that extra part.
pikey said:
[Greenwich council's building control inspector identified it as a Class II public sewer and advised he needed authorisation from Thames Water to sign that element off.
Thames water required a formal application to build close to a public sewer.
The building inspector should have picked that up when the Full Plans Building regs application was submitted.Thames water required a formal application to build close to a public sewer.
Anything public within 3m needs this agreement .
The fact that it serves adjoining properties does not in itself make it a public sewer
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