ᐅ Tiles on synthetic resin plaster? Will anything stick to it at all?
Created on: 1 Sep 2021 13:54
K
Karsten B
Hello everyone,
This concerns an exterior facade but also tiles. Since I couldn’t find a suitable forum for this, I am posting my question here.
Unfortunately, I am not a professional in construction matters and hope to get some advice here.
I am planning to have a part of an exterior facade covered with tiles.
There are concerns regarding the adhesive bond because the topcoat is made of synthetic resin render (render grain size 1.5 mm (0.06 inches)).
From what I learned in a discussion with a tiler, no adhesive will properly stick to this render.
Do you have any ideas? Are there any experiences of this kind?
Alternatives suggested so far were:
1) The render and insulation must be removed where the tiles are to be applied. Then, pretreat with a two-component bonding bridge and work with fast-setting tile adhesive.
2) Screw boards like waterproof gypsum boards or cement boards to the wall, and then bond the tiles onto these.
The total tiled area is about 30 m² (320 ft²), arranged either in a horizontal layout (approx. 1.8 x 17 m (6 x 56 ft)) or vertical layout (6.3 x 4.4 m (21 x 14 ft)).
I am looking for a solution that minimizes potential sources of failure as much as possible. Ideally, the tiles could be applied directly onto the facade or at least appear to be bonded directly to it.
I assume that alternative 1) (see above) will probably not be feasible.
Here is the facade description I received from the architect:
ETICS (external thermal insulation composite system) for the facade consists of a mineral wool insulation board, lambda value 0.034 W/mK, adhesive mortar, and reinforced organic base coat with a nominal layer thickness of 5 mm (0.2 inches), an intermediate coating (primer), as well as a synthetic resin render topcoat with render grain size 1.5 mm (0.06 inches), colored throughout with a scraped texture finish. Color chosen by client or architect, at least 4 different colors, lightness reference value similar to RAL 7024. Fire performance: Class A2 according to EN 13501-1.
Insulation board thickness: 20 cm (8 inches).
Material: STO THERM MINERAL.
Of course, time is also pressing now, so I would really appreciate your help.
Please excuse me if I am not using the correct technical terminology or if my request sounds unprofessional in any way.
Thank you very much and best regards,
Karsten
This concerns an exterior facade but also tiles. Since I couldn’t find a suitable forum for this, I am posting my question here.
Unfortunately, I am not a professional in construction matters and hope to get some advice here.
I am planning to have a part of an exterior facade covered with tiles.
There are concerns regarding the adhesive bond because the topcoat is made of synthetic resin render (render grain size 1.5 mm (0.06 inches)).
From what I learned in a discussion with a tiler, no adhesive will properly stick to this render.
Do you have any ideas? Are there any experiences of this kind?
Alternatives suggested so far were:
1) The render and insulation must be removed where the tiles are to be applied. Then, pretreat with a two-component bonding bridge and work with fast-setting tile adhesive.
2) Screw boards like waterproof gypsum boards or cement boards to the wall, and then bond the tiles onto these.
The total tiled area is about 30 m² (320 ft²), arranged either in a horizontal layout (approx. 1.8 x 17 m (6 x 56 ft)) or vertical layout (6.3 x 4.4 m (21 x 14 ft)).
I am looking for a solution that minimizes potential sources of failure as much as possible. Ideally, the tiles could be applied directly onto the facade or at least appear to be bonded directly to it.
I assume that alternative 1) (see above) will probably not be feasible.
Here is the facade description I received from the architect:
ETICS (external thermal insulation composite system) for the facade consists of a mineral wool insulation board, lambda value 0.034 W/mK, adhesive mortar, and reinforced organic base coat with a nominal layer thickness of 5 mm (0.2 inches), an intermediate coating (primer), as well as a synthetic resin render topcoat with render grain size 1.5 mm (0.06 inches), colored throughout with a scraped texture finish. Color chosen by client or architect, at least 4 different colors, lightness reference value similar to RAL 7024. Fire performance: Class A2 according to EN 13501-1.
Insulation board thickness: 20 cm (8 inches).
Material: STO THERM MINERAL.
Of course, time is also pressing now, so I would really appreciate your help.
Please excuse me if I am not using the correct technical terminology or if my request sounds unprofessional in any way.
Thank you very much and best regards,
Karsten
K
Karsten B2 Sep 2021 11:08Tommi27 schrieb:
Anchor, clean, reinforce, bond with Ardex X90, and grout with epoxy. That should work 🙂Hi Tommi,
thanks for your tip. I would be very happy if that works out. However, I didn’t fully understand what you are suggesting.
Sorry, but could you please explain it to me in more detail? That would be incredibly helpful, as I’m not a professional in this field.
What exactly should be anchored? How many times? Are there any special considerations for the anchors?
Clean with a pressure washer?
What kind of reinforcement?
Thanks for your effort and sorry for the inconvenience!
Hello Karsten, “The doweling of the current facade is only necessary because you want to apply an additional cladding. More weight... The specifications can be found from the manufacturer of the dowels used. There are guidelines such as how many dowels per square meter, etc. Then clean the surface using a pressure washer. To create a reasonably even surface/contact layer, I would also embed/reinforce a mesh there. Good luck 🙂
K
Karsten B16 Sep 2021 13:52Many thanks to all of you for your advice!