Screed preperation for floor

[JonHeath]

Hi all,

I've posted about screed / self levelling compound advice in the building forum:

//www.diynot.com/diy/threads/screed-self-levelling-compound-help.439900/

I was advised to come here when asking about drying time of screed before progressing with my Karndean preparation. What's the general rule on letting screed dry? (60mm thick)

If you see my original post I'm tempted to leave the screed and just invest in a lot of self levelling compound which will dry a lot quicker.

Thanks
Jon

 

[dazlight]

You be looking at about 70 days in good drying conditions. You could always use a liquid dpm like
Stopgap F78 or Ardex MVS95 before you use levelling compound.

 

[JonHeath]

Thanks for the reply. So are you saying I could put down the screed, and then put a liquid DPM on top (before smoothing compound) which will mitigate against the long drying time?

I might just go straight into a deep fill levelling compound. Something that does up to 50mm like this product:

http://www.ultratileadhesives.co.uk/product.jsp?productID=71

Not much of my sub floor needs that sort of depth. Does anyone have any experience with this product or can recommend similar?

Thanks

 

[dazlight]

That's screed will work fine .
Another one you could use. Is Levelflex

http://www.tilemasteradhesives.co.uk/levelflex

 

[JonHeath]

Thanks.

Still not 100% sure what I'm going to do. I'd like to be able to leave the screed and quarry tiles in place and pour a levelling compound over the top. However I'm worried that the existing screed is a bit dodgy in places. I've knocked some of it up and its only 30mm or so deep with a layer of sand underneath. Is it normal to have sand underneath?

If I rip it all up then I'm left with a big depth to try and fill. I haven't got 50+ days to let traditional screed dry. If I went with a liquid DPM on top I'd be concerned that the moisture has nowhere to go?

 

[crazydaze]

Contact F-Ball or Arditex direct and they can advise, based on your levels, to speed up installation times, you'll be needing some very specialist products. There is no margin for error here, it's very easy to blow screeds and LVT rushing drying times.