Hello,
Our screed has now been heated for 6 weeks. I am planning to lay the tiles soon with my father, but before that, I need to check the residual moisture in the screed.
What is the current state of technology? Is it best to borrow a CM meter somewhere, or are other methods like impedance or conductivity now reliable as well? For example, Conrad offers a device that supposedly measures moisture in screed with a tolerance of only ±0.5%, which would be sufficient for me.
Best regards
M.
Our screed has now been heated for 6 weeks. I am planning to lay the tiles soon with my father, but before that, I need to check the residual moisture in the screed.
What is the current state of technology? Is it best to borrow a CM meter somewhere, or are other methods like impedance or conductivity now reliable as well? For example, Conrad offers a device that supposedly measures moisture in screed with a tolerance of only ±0.5%, which would be sufficient for me.
Best regards
M.
Hello "bvlgari".
Better skip the electric testing devices; that money would be wasted!
The state of the art for measuring moisture in screeds is still the CM device. It can be rented, but inexperienced users should also stay away from it. There are simply too many sources of error that you need to know to avoid; not to mention the inherent systematic error of the measurement method!
When it comes to ceramic tiles, just as a side note, you need to be especially thorough. For example, if elastic floor coverings only detach with slight waviness when residual moisture was too high, rigid coverings like tiles and slabs often suffer total failure of the screed as well! No matter what other sources whisper to you.
NO JOKE
--------------------
Regards, KlaRa
Better skip the electric testing devices; that money would be wasted!
The state of the art for measuring moisture in screeds is still the CM device. It can be rented, but inexperienced users should also stay away from it. There are simply too many sources of error that you need to know to avoid; not to mention the inherent systematic error of the measurement method!
When it comes to ceramic tiles, just as a side note, you need to be especially thorough. For example, if elastic floor coverings only detach with slight waviness when residual moisture was too high, rigid coverings like tiles and slabs often suffer total failure of the screed as well! No matter what other sources whisper to you.
NO JOKE
--------------------
Regards, KlaRa
The drying time of a screed depends on its thickness and the surrounding climatic conditions.
Without regular fresh air circulation, a cement screed would never reach the readiness for floor covering installation.
A general rule of thumb for conventional cement screeds:
about 6 weeks for 50mm (2 inches), plus approximately 1 month for each additional centimeter (0.4 inches) of thickness.
This applies under optimal climate conditions.
From 10 to 11 cm (4 to 4.3 inches) thickness onward, a cement screed will no longer dry out voluntarily, meaning it will not dry naturally without forced drying methods!
Best regards, KlaRa
Without regular fresh air circulation, a cement screed would never reach the readiness for floor covering installation.
A general rule of thumb for conventional cement screeds:
about 6 weeks for 50mm (2 inches), plus approximately 1 month for each additional centimeter (0.4 inches) of thickness.
This applies under optimal climate conditions.
From 10 to 11 cm (4 to 4.3 inches) thickness onward, a cement screed will no longer dry out voluntarily, meaning it will not dry naturally without forced drying methods!
Best regards, KlaRa
Does this also apply to retanole screeds? One was laid in our house exactly two weeks ago, and they want to start tiling next week. It is a floating screed over underfloor heating, which is also running. All the windows are kept open, with good ventilation, strong wind, and little rain. The screed already looks completely dry visually, a very light gray. Karsten
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