Hello,
Over the past few days, we have poured our 60m² (645 sq ft) terrace using monocrete / drainage mortar.
Work is scheduled to continue in a week. All materials except the adhesive are ready. A single-component epoxy resin will be used between the joints.
How many kilograms of tile adhesive will be needed approximately for this area, and which one would you recommend?
Baumit construction adhesive for ceramic tiles and slabs on walls and floors, for indoor and outdoor use? PCI CM 117 flexible thin-bed mortar, 25 kg (55 lbs), grey? PCI Carrament 25 kg (55 lbs), grey, 3342?
Over the past few days, we have poured our 60m² (645 sq ft) terrace using monocrete / drainage mortar.
Work is scheduled to continue in a week. All materials except the adhesive are ready. A single-component epoxy resin will be used between the joints.
How many kilograms of tile adhesive will be needed approximately for this area, and which one would you recommend?
Baumit construction adhesive for ceramic tiles and slabs on walls and floors, for indoor and outdoor use? PCI CM 117 flexible thin-bed mortar, 25 kg (55 lbs), grey? PCI Carrament 25 kg (55 lbs), grey, 3342?
As an expert, I am always eager to learn more. Therefore, I have the following question and would appreciate your feedback:
Why was a single-sized aggregate screed installed, and who recommended it?
Single-sized aggregate screeds, also known as mono-aggregate screeds, have the advantage of preventing surface water from accumulating by acting as a drainage screed. However, if the pores are filled with an adhesive, this desired effect—the water-permeable characteristic of the material—is significantly compromised.
Furthermore, considering that a mono-aggregate screed with the same thickness as a standard cement screed never achieves the same flexural tensile strength and therefore must be applied at a considerably greater thickness, I question the logic of installing a drainage screed and then neutralizing its material properties by applying an adhesive that effectively acts as a sealant.
It should also be taken into account that the surface strength of a drainage screed cannot match that of a standard screed and is therefore lower. If ceramic tiles are to be installed on top, my initial question about the purpose of a drainage screed becomes even more relevant. I am also concerned that, due to the lower surface strength and the thermal expansion of the ceramic tiles (which inevitably occurs in summer), delamination and hollow spots will soon develop.
-------------
In summary:
A standard cement screed would certainly have been a better choice compared to a mono-aggregate screed that is to be covered with ceramic tiles!
Best regards, KlaRa
Why was a single-sized aggregate screed installed, and who recommended it?
Single-sized aggregate screeds, also known as mono-aggregate screeds, have the advantage of preventing surface water from accumulating by acting as a drainage screed. However, if the pores are filled with an adhesive, this desired effect—the water-permeable characteristic of the material—is significantly compromised.
Furthermore, considering that a mono-aggregate screed with the same thickness as a standard cement screed never achieves the same flexural tensile strength and therefore must be applied at a considerably greater thickness, I question the logic of installing a drainage screed and then neutralizing its material properties by applying an adhesive that effectively acts as a sealant.
It should also be taken into account that the surface strength of a drainage screed cannot match that of a standard screed and is therefore lower. If ceramic tiles are to be installed on top, my initial question about the purpose of a drainage screed becomes even more relevant. I am also concerned that, due to the lower surface strength and the thermal expansion of the ceramic tiles (which inevitably occurs in summer), delamination and hollow spots will soon develop.
-------------
In summary:
A standard cement screed would certainly have been a better choice compared to a mono-aggregate screed that is to be covered with ceramic tiles!
Best regards, KlaRa
In our entire municipality, all terraces are constructed using single-grain concrete because pouring concrete without water permeability is prohibited. This was also suggested to us by several local landscape gardeners after reviewing the development plan.
Why is epoxy resin not suitable for this? According to the description, it is water-permeable.
“Only suitable on water-permeable substrates. Characteristics: water-permeable, surface water (e.g., rain) is quickly drained into the ground. The surfaces are not completely sealed.”
Why is epoxy resin not suitable for this? According to the description, it is water-permeable.
“Only suitable on water-permeable substrates. Characteristics: water-permeable, surface water (e.g., rain) is quickly drained into the ground. The surfaces are not completely sealed.”
Maxwell8 schrieb:
Why is epoxy resin not suitable for this? According to the description, it is water-permeable. Epoxy resins are not water-permeable once cured!
There are no reactive resins that are water-permeable when fully cured.
At best, they can be permeable to water vapor to some extent (as water-emulsified resins).
----------
Regards: KlaRa
W
WilderSueden3 Jul 2023 11:09All manufacturers state that the epoxy resin mortar (presumably not the same as pure epoxy resin?) is permeable to water.
Maxwell8 schrieb:
Why is epoxy resin not suitable for this? According to the description, it is water-permeable. @ "WilderSueden":
The original statement in the question referred to an epoxy resin (see above). It is correct that a surface layer coated with what is called a "stone carpet" also has drainage properties. This is because the quartz grains (in the mortar) are only bonded together at their edges, leaving gaps that allow for drainage. However, in epoxy resin, as mentioned at the beginning, there are neither pores nor gaps but a three-dimensional chemically cross-linked macromolecule. Therefore, a "stone carpet" made with reactive resin is different from the pure resin itself. Even with an epoxy resin mortar, a dense matrix is formed, which prevents drainage behavior. It is not so simple to find the right terminology (and thus to avoid possible misunderstandings). Regards, KlaRa
Similar topics