A high compressive strength mineral wool slab which offers a cost effective insulation solution. Its dual density (high and low combined) construction provides thermal insulation properties for ground floors and acoustic insulation properties for separating floors. It has been designed to meet the thermal insulation requirements in Building Regulations (E&W) Approved Document L and the acoustic requirements in Building Regulations (E&W) Approved Document E.

Features/ Benefits:

  • Excellent acoustic and thermal performance.
  • Rigid structure makes handling and fitting simple and precise.
  • Reduces thermal and acoustic bridging.
  • Water resistant but DPM required in high water table or to protect against rising damp.
  • High compressive strength enables JCW Stonefloor Underfloor Insulation to support normal floor loadings in domestic property, offices, shops and similar areas.
  • Environmentally friendly and does not contain gases that have ozone depleting (ODP) or global warming potential (GWP). Compliant with Code for Sustainable Homes.

Standard product features


1200 x 600 x 30 mm.

Fire rating (to BS EN 1350-1):


NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-45-70/385 Mineral wool slab insulation

Product specification

An important note about specifying



JCW Acoustic Supplies Limited


+44 (0)1204 548400

Product reference

JCW Stonefloor

Manufacturer details

Units 32-34,
Waters Meeting Development,
Britannia Way,
Lancashire, BL2 2HH
Tel +44 (0)1204 548400
Fax +44 (0)1204 366960
NBS Plus