Hello,
Now started our build.
Builder by his own admission made a little bit of a mess of digging the trenches (lost his usual digger guy so tried to do himself), and once the digger had gone had to do some remedial work to extend the existing trenches and make sure they were positioned under the proposed walls of our extension, using shovels and hard graft.
Whilst I am now comfortable they are under where the walls are supposed to be, due to the original challenges the extension walls if built to approved dimensions will be off centre to centre of footings, often by quite an amount. Generally there is at least 100mm of clearance on the 'problem sides', but in a small number of places less than this (I know general good practise is 150mm).
The trenches were dug to 1100mm, and are between 600mm and 900mm wide (due to the remedial works). They have been deep filled with I estimate 800mm of concrete.
The ground is clay, which does not yield when pressed with your finger.
I've read elsewhere on here, that offsetting on footings is not necessarily a problem, but wanted to double check ok here as the brickies start on Monday?
Also what is the 'allowable margin of error' when constructing an extension (from a planning perspective), as the 'emergency option' here would be to deliberately shift the wall dimensions so they are better fitting to the trenches we have ended up with? Not an option I really want to go with, but useful to know anyway. I've heard 50mm.
Thanks in advance for replies.
Now started our build.
Builder by his own admission made a little bit of a mess of digging the trenches (lost his usual digger guy so tried to do himself), and once the digger had gone had to do some remedial work to extend the existing trenches and make sure they were positioned under the proposed walls of our extension, using shovels and hard graft.
Whilst I am now comfortable they are under where the walls are supposed to be, due to the original challenges the extension walls if built to approved dimensions will be off centre to centre of footings, often by quite an amount. Generally there is at least 100mm of clearance on the 'problem sides', but in a small number of places less than this (I know general good practise is 150mm).
The trenches were dug to 1100mm, and are between 600mm and 900mm wide (due to the remedial works). They have been deep filled with I estimate 800mm of concrete.
The ground is clay, which does not yield when pressed with your finger.
I've read elsewhere on here, that offsetting on footings is not necessarily a problem, but wanted to double check ok here as the brickies start on Monday?
Also what is the 'allowable margin of error' when constructing an extension (from a planning perspective), as the 'emergency option' here would be to deliberately shift the wall dimensions so they are better fitting to the trenches we have ended up with? Not an option I really want to go with, but useful to know anyway. I've heard 50mm.
Thanks in advance for replies.
