Tony Bryer wrote:

In article , Bob
wrote:

I think screed is used on top of the concrete to give the finished
level for flooring, usually when tiles are to be installed, so it
would be a thin layer.


50mm is usual


Sharp sand would be the aggregate rather than stone. This may not
be fully correct as there has been an amount of wine involved.%-)


Yes 1(of cement):3-4 (sand) would be normal.

Screed is a much wekare mix than concrete and contains no stones.

I've been using a 10:1 mix of sharp sand and cement to bed stone slabs on.

Its striong enough, but concrete it ain't. Its cheaper as teh cement is
tehbig cost.

Its porous because teh faps between teh sand grains are not totally
filled with cement.

If you like, screed is simply snad loosely bound together with cement.

In flloring its normally mixed fairly dry as well, so it has no tendency
to slump. Then its sweated with a float to bring the water to the top
and create a sligthly better surface finish.

I'd say 5:1 is about right for floors.