Facade SystemsExternal WallsSeparating FloorsInternal and Separating WallsIntermediate FloorsFire Solutions 

Product description

ROCKWOOL FLEXI® is a multi-use, dual purpose thermal and acoustic insulation product with a unique flexible edge along one side. The flexible edge ensures a perfect fit is maintained between the product and its supporting framework for optimum effectiveness. The product consists of a semi-rigid slab with a flexible edge along one side. Advantages

  • Patented ‘flexi’ edge offers accurate fit to all widths
  • Will not slump, even if studs shrink
  • Fits all typical metal and timber frame spacing
  • Excellent thermal, acoustic and fire properties
  • Non-combustible (Euroclass A1)
  • Easy to handle and install
  • Superior fit with no waste

How to use this product

ROCKWOOL FLEXI® provides effective thermal insulation, fire resistance and acoustic performance in all framed areas of the building. The ‘flexi’ edge allows the product to be tightly fitted between timber and metal frames, without the need for cutting or waste.

Performance & properties

Thermal Properties

ROCKWOOL FLEXI® has a thermal conductivity of 50 – 120mm, 0.038 W/mK when tested to EN13162. At 140 mm thickness, ROCKWOOL Flexi™ has a thermal conductivity of 0.035W/mK. Refer to the datasheet for U-values.

Acoustic Properties

ROCKWOOL FLEXI® works in two distinct ways to reduce noise, either by impeding the transmission of sound through an element of the structure, or by absorption of sound at the surface. Noise absorption is expressed as a factor between 0 and 1.0. The more sound that a surface absorbs, the higher its absorption coefficient. The structure of the fibres in ROCKWOOL FLEXI® slabs make them ideal for use as a sound absorber, with characteristically high coefficients over a wide frequency range.

Fire Properties

ROCKWOOL FLEXI® achieves a reaction to Fire classification of A1, as defined in EN13501-1. Refer to datasheet and SOPUNDPRO® guide for relevant fire rated constructions. Specifically for details about the ROCKWOL FLEXI® 1 Hour fire floor and fire rated internal partition. Refer to the Application Guide for construction information.

Green Guide Rating

ROCKWOOL FLEXI® corresponds to the BRE Global Green Guide online generic specification ‘Stone wool insulation - density 45 kg/m³ ’ (ref. 815320008) which achieves a summary rating of ‘A+’ within all building types.

Water Repellency

All ROCKWOOL® stone wool insulation repels liquid water due to its fibre orientation and the presence of water repellent additives.

Third Party Approvals

ROCKWOOL FLEXI® has the following certifications: LBCB 022E (Loss Prevention Certification Board) KM 06661 (KiteMark) LUL (London Underground Limited) CE Mark

Ozone Depleting Potential

Relying on entrapped air for its thermal properties, we are proud to say that ROCKWOOL FLEXI® does not contain (and has never contained) gases that have an ozone depleting potential (ODP).

Global Warming Potential

Relying on entrapped air for its thermal properties, we are proud to say that ROCKWOOL FLEXI® does not contain (and has never contained) gases that have a global warming potential (GWP). Therefore, they have a zero GWP for the purposes of rating schemes such as the Code for Sustainable Homes.