FireCrunch is more expensive than plasterboard due to the additional properties that make FireCrunch a superior lining product.
We cannot give you price variations here as plasterboard prices vary between suppliers, however, the cost of maintaining plasterboard in the long term well outweighs the cost of installing FireCrunch to begin with. Plus only 1 layer of 10mm FCA equals 3 layers of 13mm for 90 minutes in fire.