Hi, I’m new to this forum. I’m interested in peoples view on how I should infill the void in an oak truss I’ve just had installed. The architect has suggested Infill the voids of the truss using 50 x 75mm softwood studs at maximum 600mm ctrs with 12.5mm plasterboard and skim finish. Stud partitions to be filled with 75mm Rockwool Acoustic Insulation to achieve adequate sound insulation and 30mins fire resistance. This would lose 100mm of the oak truss depth that is visible. Could I use fermacell instead, would that give me the same fire protection but allow more oak to be visible. I’ve written to my building inspector to ask if it’s possible.
thanks in advance