Anhydrite Screed Prep

[tubs]

Hi

I know these questions have been asked time and time again but here goes !

I have a ground floor area of a house around 160m2 to tile, the screed is calcuim sulphate , the depth is 70mm, this was laid around 3 months ago , all i need to know are the proper steps to follow , ie how dry etc it has to be , do you put the heating on prior to tile , sanding the latience and what primer and adheive is best ???

Thanks Martin

 

[Old Mod]

Hey Martin,
Tbh never laid to a Anhydride screed myself,

U may find this useful tho!

Good luck mate!

 

[AliGage]

I've just done half a dozen floors at one place with Anhydrate.
After speaking to Weber technical these are the steps u took.

Sanded off latency with floor sander.
Swept and hoovered all dust
dust.
Primed using PR360 @ 3:1 until substrate would not absorb anymore. Anything left on the surface was wiped off with a sponge.
Fixed ditra, and tiled.

 

[widler]

Ive done as ali except with tiemaster products (primer and anylfix)
Plus , yes get the heating on beforehand

Plus you need to mke sure its dry enough
Oh yes and don't just wack it on fully, turn it on lowxand gradually turn it up
Oh and wear a seatbelt when driving

 

[Dave]

No one has mentioned how dry it should be , 75% RH and yes the heating should be commissioned and you don't just crack the heating on , needs to be heated slowly and the same on cool down.
If there is still moisture within the screed (70mm is deep) then you can use the heating to force dry.

 

[Old Mod]

No one has mentioned how dry it should be , 75% RH and yes the heating should be commissioned and you don't just crack the heating on , needs to be heated slowly and the same on cool down.
If there is still moisture within the screed (70mm is deep) then you can use the heating to force dry.

Ooow ooow! I did I did! Hahaha

 

[widler]

Look , i did as well

 

[Andy Allen]

Yeah widler....don't just wack it up....

 

[tubs]

Thanks for the feedback !

 

[AliGage]

Sorry Dave

 

[Dave]

I love how widler updated his post lol lol lol lol....

 

[widler]

Ha ha, how did u know ? Was it the seatbelt comment

 

[bcd-87]

No one has mentioned how dry it should be , 75% RH and yes the heating should be commissioned and you don't just crack the heating on , needs to be heated slowly and the same on cool down.
If there is still moisture within the screed (70mm is deep) then you can use the heating to force dry.

what's the RH stand for ?

 

[Dave]

what's the RH stand for ?

relative humidity