Hi,

We've just had a concrete floor done by a professional builder and I'm 
proposing to lay a wood floor over it. However I'm not convinced the floor 
is level enough - I'm seeing variation of maybe 7-8mm over a 1m length of 
floor, and there's no way the underlay is going to be able to take up that 
much undulation.

Would you agree that this isn't flat enough to lay a wood floor onto as it 
stands?

I'm going to insist that the builder comes back and improves the flatness 
(levelling compound or rescreed the floor or whatever) before we make the 
final payment. Does anyone know if there's a standard for acceptable 
flatness of a domestic concrete floor specified in Buildings Regs or 
anywhere similar?

Cheers, Nick

nbdobb@SPAMTRAPDELETEiee.org

"Nick Dobb"  wrote in message
news:Wh1ee.17239$WW5.5897@newsfe2-win.ntli.net...

> Hi,
>
> We've just had a concrete floor done by a professional builder and I'm
> proposing to lay a wood floor over it. However I'm not convinced the floor
> is level enough - I'm seeing variation of maybe 7-8mm over a 1m length of
> floor, and there's no way the underlay is going to be able to take up that
> much undulation.
>
> Would you agree that this isn't flat enough to lay a wood floor onto as it
> stands?
>
> I'm going to insist that the builder comes back and improves the flatness
> (levelling compound or rescreed the floor or whatever) before we make the
> final payment. Does anyone know if there's a standard for acceptable
> flatness of a domestic concrete floor specified in Buildings Regs or
> anywhere similar?
>


8mm to 1 metre is almost guttering specification for water drainage
are you sure the whole area is'nt deliberatly slanted to allow water to
drain away?

If its up in one place and down in another, get him back to re-do
--
Vass

"Nick Dobb"  wrote in message
news:Wh1ee.17239$WW5.5897@newsfe2-win.ntli.net...

> Hi,
>
> We've just had a concrete floor done by a professional builder and I'm
> proposing to lay a wood floor over it. However I'm not convinced the floor
> is level enough - I'm seeing variation of maybe 7-8mm over a 1m length of
> floor, and there's no way the underlay is going to be able to take up that
> much undulation.



I remember being around when our new kitchen floor was laid, and the builder
couldn't have been more careful with spirit level on a long straight edge
etc.  I was very surprised when I later installed my kitchen units to find
that there was a 19mm in 60cm slope under the units.

At work we had builders relay a floor 3 times trying to get <6mm in 10m -
they claimed they could do it, but we measured and rejected as it was
necessary for correct assembly of a screened room.  Eventually we employed
the guys responsible for the fountains in Milton Keynes, and they got it
right - no problem.
-- 
M Stewart
Milton Keynes, UK
http://www.megalith.freeserve.co.uk/oddimage.htm

"Malcolm Stewart"  wrote in 
message news:d5ae21$n2t$1@news8.svr.pol.co.uk...

> "Nick Dobb"  wrote in message
> news:Wh1ee.17239$WW5.5897@newsfe2-win.ntli.net...
>> Hi,
>>
>> We've just had a concrete floor done by a professional builder and I'm
>> proposing to lay a wood floor over it. However I'm not convinced the 
>> floor
>> is level enough - I'm seeing variation of maybe 7-8mm over a 1m length of
>> floor, and there's no way the underlay is going to be able to take up 
>> that
>> much undulation.
>
> I remember being around when our new kitchen floor was laid, and the 
> builder
> couldn't have been more careful with spirit level on a long straight edge
> etc.  I was very surprised when I later installed my kitchen units to find
> that there was a 19mm in 60cm slope under the units.


I should emphasise that what I'm talking about here is not a slope - it's 
undulation, i.e. there's at least one 'valley' in the floor that is about 
70cm wide and about 7mm deep in the middle.