On 05/06/10 10:12, Dave Liquorice wrote:
On Sat, 5 Jun 2010 09:53:37 +0100, The Medway Handyman wrote:

They want a metal shed erected on top, but there is no way thats going
to work until the base is sorted.

Simple. Get the people who did the base to dig it out and replace
properly at their expense.

If cowboys are allowed to get away with crap they will remain in
business.


Wot Dave said.


But if you do end up fixing it, I wouldn't put more concrete on top,
because unless you are expecting to put about 3" thickness all over
you'll liable to end up with a weak layer that may crack off.

What you could do is screed it (ie sharp sand, cement, forget the
pebbles). As long as that goes on about 30mm all over (so 50mm in the
off level bit) it would probably be fine and it would look dead smooth.

Keep whatever you do covered for a few days by polythene in this sun or
it will fall off if it dries out without setting.

Lots of water/cement slurry on the existing concrete to assist with the
bond.

You could go all the way to an SBR screed regime as mentioned recently
then you could repair it down to 10mm minimum depth. Maybe the cost of
the SBR will balance the saving in the materials???

Don't know what the original monkeys were doing. I can get raw concrete
good to 5mm in a confined inside 3x1m space without formwork or guides
(flat enough to take insulation).

With level formwork and a straight bar it could hardly be easier. It
should be practically perfect.

--
Tim Watts

Hung parliament? Rather have a hanged parliament.