APPLICATION 100mm DriTherm 37 Standard Cavity Slabs are used for the thermal insulation of: Masonry cavity external walls, either partially filling or fully filling the cavity For use in buildings up to 12m high in any exposure zone For use in multi-storey applications up to 25m in height 100mm DriTherm 37 Standard Cavity Slabs have been used in many buildings over 25m in height, including exposed coastal sites. Approval can be sought from Knauf Insulation Ltd and the British Board of Agrément for DriTherm Cavity Slab’s use in buildings over 25m high.