Flexi®
Flexi® slab has been designed as a multi-use, dual purpose acoustic and thermal stone wool insulation with a unique flexible edge along one side.
The Flexi® slab is manufactured with the flexible edge which ensures a perfect fit is maintained between the insulation and the supporting framework. The insulation is easy to install and can be fitted between fresh timber and will expand into the wider space as the timber dries out and shrinks back. ROCKWOOL Flexi® is Euroclass A1 non-combustible as defined in EN 13501-1 and provides additional thermal and acoustic benefits in application.
It is suitable for use all over the home, in pitched roof rafters, framed external walls, internal partitions, intermediate floors, separating walls and floors, and timber suspended ground floors.
Specification
| NBS Clause | Length (mm) | Width (mm) | *Approved thickness range (mm) |
K10-115, K10-125 K10-145, K10-155 K10-165, K10-215 K11-115, K11-125 K11-135, K11-145 K11-795, K11-796 K20-150, K21-120 K21-130, K21-140 P10-140, P10-170 P10-240, P10-250 | 1200 | 400, 600 | 50 - 200 |
*Thickness options may be subject to a minimum production volume. Speak to the specification team for guidance.
Standards and Certification
| Product standards | BS EN 13162, Keymark, Kitemark |
| CE Marking | CE Marked |
Technical Properties
| Reaction to fire (Euroclass) | Euroclass A1 |
| Thermal conductivity | 50-120mm 0.038 W/mK 140mm> 0.035 W/mK |
| Acoustic | Achieves Part E (resistance to sound) when installed in accordance to ROCKWOOL guidelines |
| Water vapour resistance | 5.2 MNs/gm |
| Water repellent | Yes |
Thermal Performance
Construction Example: Warm/Hybrid frame (with no service void).
Warm/hybrid timber frame cavity wall with ROCKWOOL Flexi insulation between studs and 50mm ROCKWOOL RainScreen Duo Slab, fixed to face of OSB over breather membrane
U-value (W/m²K) | RainScreen Duo Slab over OSB (mm) | Flexi® in frame (mm) |
| 0.25 | 50 | 90 |
| 0.19 | 50 | 140 |
CAD Drawings
Download CAD Drawings here
