Is Rockwool Flexi only to be used in a timber frame?

Rockwool Flexi slab is an effective thermal and acoustic insulator for use throughout the structure. This could be in pitched roof rafters, framed external walls, internal partitions, intermediate floors, separating walls and floors, and timber suspended ground floors. The flexible edge makes the product a particularly good solution in a timber frame as it helps to overcome the issue of timber shrinkage/expansion by filling the space left behind.