It occurs to me that rather than go back to my schoolboy maths (I failed the O level) someone might quickly and easily be able to work out the quantities of sand and cement I need for the screed floor I am about to lay.

The room is 11' by 5' 6" by 3 1/2 " deep.  Any takers?

I make that about 335  by 168 by 8.89 cm, for those who think in metric.  Don't rely on the conversion however - as I say, I failed maths!

Thanks - and thanks to Jerry for his help so far.

John D

Don't forget that a cubic metre of sand will not quite make a cubic metre of screed due to 'bulking' of sand when it is damp.

You may need as much as 5.5 - 6 cu/m of sharp sand to get 5 cu/m of screed.


Now the cement.  A 25kg bag of cement will produce 0.06 cu/m of screed at 4:1 mix so for 5 cu/m you will need 83 bags.

Good luck!

btw, for volumes like this we always get Tilcon Ready mix screed.  Screed is difficult and slow to mix in a conventional mixer.  Ready mix screed has a retarder in it so you have all day to lay it.  If you do decide to get Readymix screed you will need 5 cu/m as the bulking has been taken into account by the batching plant.

Bloody 'ell Dewy.  What a cock up  

lol

Well spotted woody!  

(btw, it's always best to over-order slightly................  )

Better to look at it than look for it!      

If there's any left over I've got Dewy's address  

btw, just divide everything I said by 10  

Erm.... 8.3 bags, ok get 10 then  

lol

Seven sacks of cement did it - and there was some sand left over too - the floor sloped more than I realised! Result was not absolutely perfect but quite good enough!

Thanks to all who gave advice.

JohnD