What adhesive best to use for attaching GRC?

The issue of securing GRC with adhesives arouses quite intensive discussions among professionals in the construction industry. Some believe that adhesives provide good fixing only in dry interiors. Others, however, argue that the only situation in which anchors should be used instead of adhesive is laying GRC panels outdoors, on a façade insulated with mineral wool. Apart from the above case, GRC can stick to any suitably strong and primed substrate, both indoors and outdoors. However, the truth looks a little different.
First of all, it is worth remembering that not every GRC panel should be fixed with adhesives. Some are simply too heavy. They may also require a suitable surface to which they may be fixed, such as unclad wall, which is not always possible. If the panel with dimensions 120x60x2 cm weighs approx. 25 kg, then there are no major contraindications to it being glued. But if its weight exceeds 40 kg, bonding may not be the best solution, especially where the individual panels are located on the ceiling or on the wall and support each other.
Besides, it is a GRC manufacturer who has a sort of obligation to determine as accurately as possible the way of fixing their product, and recommend an appropriate adhesive. Of course, the best course of action in this case is to use the services of an installation team recommended by the concrete manufacturer.
Adhesives that are most commonly recommended by GRC manufacturers include gypsum mortars or highly-flexible mineral adhesives. For indoor use, it is often enough to use a high-quality tile adhesive. The perfect solution, although relatively expensive, involves using very strong epoxy adhesives. It is also worth considering traditional polyurethane adhesives, although in their case, one should consult the GRC manufacturer.


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