Hi all. New to Forum from Scarborough

[pear tree]

Hi all, I`m a plasterer and Tiler and have been for a number of years. Came across this site and looks like you`re all a friendly bunch.
Has anyone had problems with drying times with Gyvlon floors? I`m waiting for a floor to dry out which has been a few months now. Have used correct methods of testing and drying(has underfloor heating) but can`t get below 85%.
I know I need to be at around 75% to be able to tile and to sand the surface and seal. But my readings never go below 85%. Is this normal?
Thanks for reading this and any advise you might have.

 

[Gazzer]

Welcome to tilersforums.com.

 

[DHTiling]

It can be sanded to aid drying , what are you testing RH with ?

 

[Ajax123]

How are yo measuring iitnis your equipment calibrated
What is the depth of screed and hw long ago was it laid
what is th floor build up
what is the ambient humidity in the building
Have you comissioned and run the heating yet

 

[Ian]

Welcome along to TF

 

[Gazzer]

The meter you are testing with could be a fault here ..not saying it is but what sort is it ?

 

[Gazzer]

Oh and welcome, The main man to listen to is Alan, AJAX.

 

[steve187]

Hi and welcome to the forum, have you considered kerakoll ideal for the floor saves having to seal, i used a different kerakoll product the other week and found it easy to mix/use. sorry i can not help with the drying out problem

 

[pear tree]

Thanks all for welcoming me to the forum.i didn't have a part in laying the gyvlon floor, but but
have found out that floor is 60mm deep which could explain why its taking so long to dry. I calculate it to be 90 days at that depth if im right. The reading has gone down slightly now.

 

[White Room]

Hi and welcome......

 

[Ajax123]

Yes 60mm would take 90 days in ideal conditions. We have had less than ideal
Conditions for drying this year so add a bit onto that. When you place the meter on the floor (I assume it is a floor hygrometer) it hould not stay in place for longer than 72 hours otherwise you start getting issues with interstitial condensation in he moisture chamber which will give you a false reading. Typically 48hours will give you an accurate reading. if you need toile quickly and are below 85% rh measured using a hygrometer then there are options. One is ditra and the other is gypsum based adhesive e.g GBTA from creative impressions. . Kerakoll h40 ideal is not designed to work above 75rh on these screeds so whilst you might get away with it there would be no guarantees. I would not risk it myself. If you go ditra you would need touse gypsum to stickit down with. You MUSt comision and run the underfloor heating prior to covering the screed and this can be done now if it H's not already done. In doing this you will help to force dry the screed but this will only happen if you do it properly and run it p to high low temperatures around 55degrees C. There is a simple procedure for doing this. Run at ambient for three days then increase by 5 degrees per day p to maximum. Leave at tis temp for 7 days minimum. Then cool by 5 degrees per day back to ambien before switching off for 48hours before re measuring the moisture. I wold expect a 60mm screed to be dry a the nd of this procedure if you maintain the top temperature for about 10days.