I just learned something new: there are rectified tiles and calibrated tiles (in addition to "normal" tiles). Have you installed either of these? If so, why? Do you have any photos?
[QUOTE=http://WWW.fliesenaktuell.de/Blog/?p=52] ... Tiles produced in a manufacturing process can have slight size variations, typically around 1-2 mm (0.04-0.08 inches). [...] However, when laying these tiles, joints of about 5 mm (0.2 inches) need to be left to compensate for these small differences.
Calibrated tiles, on the other hand, have uniform dimensions. These tiles are measured after production and sorted by size. [...]
Rectification refers to a specific edge treatment for porcelain tiles. After production, the tiles are precisely cut to an exact, consistent size with 90-degree edges. The exact dimensional accuracy of rectified tiles allows them to be installed with very narrow joints, around 2 mm (0.08 inches). [/QUOTE]
[QUOTE=http://WWW.fliesenaktuell.de/Blog/?p=52] ... Tiles produced in a manufacturing process can have slight size variations, typically around 1-2 mm (0.04-0.08 inches). [...] However, when laying these tiles, joints of about 5 mm (0.2 inches) need to be left to compensate for these small differences.
Calibrated tiles, on the other hand, have uniform dimensions. These tiles are measured after production and sorted by size. [...]
Rectification refers to a specific edge treatment for porcelain tiles. After production, the tiles are precisely cut to an exact, consistent size with 90-degree edges. The exact dimensional accuracy of rectified tiles allows them to be installed with very narrow joints, around 2 mm (0.08 inches). [/QUOTE]
This is all baffling!
The term "anhydrite screed" is outdated, has long been removed from professional terminology, and has been referred to as "calcium sulfate screed" (CAS) since 2003.
While it is theoretically correct that calcium sulfate screeds absorb moisture when looking at their material-specific sorption isotherm, this is more of an academic point. Cement screeds absorb moisture starting at about 65% to 70% relative humidity, whereas calcium sulfate screeds only do so above 85% relative humidity, and then only marginally.
A screed is not ground in order to achieve load-bearing capacity. Screeds, regardless of how they are installed, are not a load-bearing (and therefore non-structural) component!
Furthermore, load-bearing capacity cannot be created by material removal, as grinding represents, but only the readiness for covering with regard to surface strength of the substrate.
On a personal note, I suspect that the tiler has probably not fulfilled a necessary continuing education requirement in the trade for many years.
And I mean that seriously!
----------------------
Regards, Klaus
The term "anhydrite screed" is outdated, has long been removed from professional terminology, and has been referred to as "calcium sulfate screed" (CAS) since 2003.
While it is theoretically correct that calcium sulfate screeds absorb moisture when looking at their material-specific sorption isotherm, this is more of an academic point. Cement screeds absorb moisture starting at about 65% to 70% relative humidity, whereas calcium sulfate screeds only do so above 85% relative humidity, and then only marginally.
A screed is not ground in order to achieve load-bearing capacity. Screeds, regardless of how they are installed, are not a load-bearing (and therefore non-structural) component!
Furthermore, load-bearing capacity cannot be created by material removal, as grinding represents, but only the readiness for covering with regard to surface strength of the substrate.
On a personal note, I suspect that the tiler has probably not fulfilled a necessary continuing education requirement in the trade for many years.
And I mean that seriously!
----------------------
Regards, Klaus
...yes, Sebastian. All corners, the bathtub area, and the entire shower have been sealed with a waterproof membrane.
It's great that Klaus is sharing his knowledge openly here; we would have appreciated having an expert like him during the construction phase! We had three(!), but unfortunately, none of them were convincing....
It's great that Klaus is sharing his knowledge openly here; we would have appreciated having an expert like him during the construction phase! We had three(!), but unfortunately, none of them were convincing....
S
Sebastian7920 Mar 2016 10:49Yep, same for me – luckily without any inspector involved.