I’ve just installed 4 steel beams in my house, do I still need to box them in with plasterboard if they are at joist level (the ceiling will be flush).
The structural calculations only say 30 mins fire proof. If I were to use the fire retardant board on the bottom of steel, would that be enough?
The structural calculations only say 30 mins fire proof. If I were to use the fire retardant board on the bottom of steel, would that be enough?