The building regs say that a waste/soil/toilet stack pipe has to be at
least 900mm above an opening window within a few metres.
If the stack pipe was 10mm short of this then would that be seen as being
with some marigin of error accepted by the regs?
Or would the regs mean that it must be corrected and made up to the full
If the window is right up against the stack? I'd expect a building
inspector to care a bit more if so than if it's almost outside the
Is the building inspector likely to be looking for reasons to refuse
a completion certificate? (Try to avoid getting into this situation;
rumour has it it that offering tea and biscuits before you get to
this point is worthwhile.)
On Tuesday, 17 November 2015 14:16:38 UTC, Martin Bonner wrote:
Depends. If the inspector gets the impression the building is generally ok and that any minor niggles will be dealt with then he's unlikely to be too exacting.
If he's not happy with the building and wants to refuse a certificate then he'll have to find a reason for doing so.
Certainly nothing wrong with tea and biscuits -- after all if he's sitting eating biscuits he's not looking at your vent pipes :-)
The stack pipe was far too short originally (780mm plus grille) and the
builders were extremely reluctantly extended it. The new one now comes
to just short of the full 900mm.
The builders are now very awkwardly sticking to the smallest details of
the plan in the written agreement about additional work with much
flexibility at all. So I wonder if I could, in turn, insist the stack be
made up to the full 900mm. Might save a call out charge for the
What's that about no one taking a tape measure to it? :-)
Quite frankly I don't think anyone could every measure it *that*
accurately. 1cm is definitely an error margin over 90cm - you are
talking about a 1% error. Tell the BCO it's 900 and leave it at that.
Visibly it's going to look "about right".
On Tuesday, 17 November 2015 16:14:51 UTC+1, Tim Watts wrote:
I think the builder could legitimately argue that is 960mm. The
width of the bit of plastic around the window is irrelevant, it's
the height above the opening that matters.
I might warn the builder (possibly in writing), that you will hold
him responsible for any failure of the building inspector to issue
a completion certificate and for any charges that may become
payable if the building inspector has to make a repeat visit.
OTOH, you risk the builder just sticking a coupling on the top which
will look dreadful.
I also think another poster is right - try very hard not to get
into a dispute with the builder. If you have changed your mind
about what you want, you are going to have to pay for it :-(
The coupling idea, which I saw Mr Pounder write about earlier, might be a
quick and dirty solution but not necessarily to my advantage. :-(
I had been kind of thinking that the building regs do not say "at least
900mm OR THEREABOUTS". They say 900mm minimum. If the regs wanted it to
be 890mm or more then they would have said 890mm instead of 900mm. However
this is probably purely speculative.
In addition, my detailed millimetre-specific measurements failed to take
into account that the PVC window opening is a few millimitres below the top
of the opening part of the window.
I too can imagine that it happens a lot. Luckily for me your subsequent
speculation is incorrect but thank you anyway for the friendly warning.
However Jonno was partly right about our contractor being less than happy
but hopefully that is now circumvented as I mention in my other posts.
Umm.. There must be a balance between ensuring the builder complies with
the regulations and the design spec. without leading to conflict.
External supervision may be worth the money but two jobs I know of it
appeared wasted leaving the clients dissatisfied. 10% snagging hold over
with expert checking?
You're right that I am indeed being pedantic. I had been kind of thinking
that the building regs do not say:
"at least 900mm OR THEREABOUTS"
"at least 900mm TO THE BEST OF YOUR ENDEAVOURS"
"at least 900mm ALLOWING FOR SOME ERROR"
Instead they say "at least 900mm.
If the regs wanted it to be at least 890mm then they would have said
890mm instead of 900mm. However this is all now speculative and your
point about not entering into an outright dispute is well taken.
You're worrying too much.
The regs say >= 900mm. They do not quote an error tolerance.
Error tolerances are normal and the BCO would have to be looking for an
excuse to not allow a +/-1% error - which is a *good* error in the real
I agree that error tolerance are normal but also normal would be to
build the tolerance into the figure used in the specification. So if
the requirement was actually a minimum of 1000mm give or take 10% then
the requirement becomes a minimum of 900mm simply stated.
If you went to your bank to draw ?900 but they ... well, you know where
this is going and I don't need to finish it!
However other factors (like couplings, disputes with builders, etc) have
now overtaken the value of outright measurements in my case.
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