How long should cement cure before laying ceramic tiles? Screed is going
down today. There will be underfloor heating if that is an issue.

Want back in house before Dec 19... wah....

Suzanne

In article ,
"Suz" writes:
How long should cement cure before laying ceramic tiles? Screed is going
down today. There will be underfloor heating if that is an issue.

Cement takes 4-6 weeks to reach final set (and needs to retain
some moisture during this period, not enough to feel wet, but
I wouldn't artificially heat it).

Want back in house before Dec 19... wah....

I would leave it as long as you can. Probably don't need full
set just for tiling, but if you do it too early, I think you
risk the tiles pulling away with the screed surface. (This
is probably more an issue of when you start using the floor,
than when you lay the tiles.)

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

On 28 Nov, 08:09, "Suz" wrote:
How long should cement cure before laying ceramic tiles? *Screed is going
down today. *There will be underfloor heating if that is an issue.

Want back in house before Dec 19... *wah....

Suzanne

1 day per mm, officially (thats for sand/cement, rather than pourable
screed which sets much faster).

The way around it is to use Schluter Ditra matting as an intermediate
layer between the green screed and the tiles. Flexi adhesive under
and over the matting. More expense, but you can tile as soon as it is
firm enough to stand on and gives you a shot at your Christmas
ambitions...

wrote:
On 28 Nov, 08:09, "Suz" wrote:
How long should cement cure before laying ceramic tiles? �Screed is going
down today. �There will be underfloor heating if that is an issue.

Want back in house before Dec 19... �wah....

Suzanne

1 day per mm, officially (thats for sand/cement, rather than pourable
screed which sets much faster).

The way around it is to use Schluter Ditra matting as an intermediate
layer between the green screed and the tiles. Flexi adhesive under
and over the matting. More expense, but you can tile as soon as it is
firm enough to stand on and gives you a shot at your Christmas
ambitions...

can it not get tiled after you move in?


NT

Suz wrote:
How long should cement cure before laying ceramic tiles? Screed is going
down today. There will be underfloor heating if that is an issue.

Want back in house before Dec 19... wah....

Suzanne


Only enough so that any cracks that appear can be filled with PVA, or
that was my experience anyway.

Strictly you should let it dry out thoroughly - weeks - but it will
simply slow the evaporation rate from the screed by tiling it. ince te
cement you will uses is pretty wet anyway, I wouldn't regard that as a
major issue.

You might want to hold up grouting it though.

But really, the best tiled and DPM'ed screed still has some form of path
to air, even if its a very slow one. It will dry out eventually whatever.

I would lay off heating it for a few weeks though. To let the strength
build.

Andrew Gabriel wrote:
In article ,
"Suz" writes:
How long should cement cure before laying ceramic tiles? Screed is going
down today. There will be underfloor heating if that is an issue.

Cement takes 4-6 weeks to reach final set (and needs to retain
some moisture during this period, not enough to feel wet, but
I wouldn't artificially heat it).

Want back in house before Dec 19... wah....

I would leave it as long as you can. Probably don't need full
set just for tiling, but if you do it too early, I think you
risk the tiles pulling away with the screed surface. (This
is probably more an issue of when you start using the floor,
than when you lay the tiles.)

It's well worth dousing the floor with PVA before tiling. As much to
kill any surface dust as anything.

On 28 Nov, 10:30, wrote:
On 28 Nov, 08:09, "Suz" wrote:

How long should cement cure before laying ceramic tiles? *Screed is going
down today. *There will be underfloor heating if that is an issue.

Want back in house before Dec 19... *wah....

Suzanne

1 day per mm, officially (thats for sand/cement, rather than pourable
screed which sets much faster).

The way around it is to use Schluter Ditra matting as an intermediate
layer between the green screed and the tiles. *Flexi adhesive under
and over the matting. *More expense, but you can tile as soon as it is
firm enough to stand on and gives you a shot at your Christmas
ambitions...

Having said that, here's another cheaper one (tile after 7 days):

http://194.223.92.131/pdf/Technical%...d_Adhesive.pdf

On 28 Nov, 15:27, The Natural Philosopher wrote:

It's well worth dousing the floor with PVA before tiling. As much to
kill any surface dust as anything.- Hide quoted text -

- Show quoted text -

Don't do this if the floor might get wet. Use SBR if you want to
prime it, not PVA. PVA is a bad idea in this application. You end up
gluing the tiles to something that turns into a squidgy mush if it
gets wet, which is pretty dumb thing to do when the screed itself is a
much better substrate.