We are in the process of renovating an apartment and have removed part of a load-bearing concrete wall (yes, we have the necessary permits, approvals, and statements from the board and structural engineer).
In the structural engineer's report, it is stated that the installed steel pillar should be clad in double plasterboards for fire protection. We will of course do this and install them with staggered joints between the layers.
Our question is which adhesive we should use to glue the plasterboard to the steel pillar and between the plasterboard layers. Regular PL400? Or is a special adhesive required since it concerns fire protection?
The smoothest option is KNAUS Fireboard which you staple to the boards, so no impact on the beam or any glue.
Cladding of VKR Pillars Without Frame - Knauf Danogips
Norgips advocates their system with PHL Profiles;
Fire Protection Insulation of Steel Structures - Norgips
Knauf also has their system with PHL profiles;
Cladding of VKR Pillars - Knauf Danogips
So check what the manufacturer of the cladding you intend to use recommends.
The cladding will be regular 12.5mm plaster, in two layers.
It is okay to glue if the adhesive is approved for this. Ordinary tile adhesive won't work. We usually fasten with a bolt gun, but you can also screw it directly into the steel. Alternatively, use steel profiles and screw as usual.
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