ᐅ Wall connections, corners, and joint formation with Fermacell

Hello everyone,

can someone explain if there is a "best" method for connecting Fermacell gypsum fiberboards at the walls? The Fermacell brochure lists several options (see excerpt from the brochure). However, I don’t understand which method is intended for which purpose. Or can the wall joints be glued with the same adhesive used for the other joints? Or will there always be a small crack in the corners? If you then apply textured plaster, the crack will probably still appear.

Specifically in a timber frame house.

Thank you very much

The best connection is a sliding joint that allows for structural movement caused by building shifts or thermal/hygroscopic deformation, which will inevitably occur.

Fully filled joints will crack again. The method with an inserted separating strip works, or with a built-in joint profile as a shadow gap, but usually from the gypsum board systems of Knauf/Rigips or, for example, Protektor. This solution is very high quality. In the case of a very precise new construction, it may also be possible to work simply with a sharp, exact edge of the board with spacing. Fermacell boards are edge-stable. However, this requires very careful preparation and perfect execution.

Thank you for the explanation. But won’t the wall covering, whether painter’s fleece or textured plaster, crack again at this spot? Or is it possible to fill the narrow joint with inserted separating tape using acrylic?

Read and understand: "Fully filled joints will crack again." Painter's fleece might help to conceal it. The only solution is to try it. It depends on the building construction. A timber frame structure experiences more movement than a solid construction.

So, should the sealing tape only be cut after the base coat plaster?
And how is it handled with painter’s fleece?

Hello,

I need to bring up the old topic again.
Does anyone have experience with Rigips AquaBead Flex PRO? It is a corner tape that has a self-adhesive layer. However, I am not entirely sure whether a 5mm (0.2 inch) gap needs to be left and then filled with joint compound, or if the corner is butted directly and the corner tape is applied afterwards.