Rockwool Flexi Slab Insulation 600mm- All Thicknesses

Description

ROCKWOOL Flexi® Slab – Premium Stone Wool Insulation for Thermal, Acoustic & Fire Performance

Product overview
ROCKWOOL Flexi® Slab is a high-performance, dual-purpose insulation slab crafted from stone wool. Engineered to combine excellent thermal and acoustic performance with superior fire resistance, this versatile slab features a patented flexible edge that ensures a perfect friction fit between the insulation and framing—minimising air gaps even as timber or metal structures move over time.

Key features & benefits

• Flexible edge for friction fit – The unique Flexi® edge compresses to accommodate timber or metal studs, ensuring a snug fit that reduces gaps and maintains long-term performance.

• Excellent thermal performance – Thermal conductivity of 0.038 W/m·K (50-120 mm) and 0.035 W/m·K (140 mm+), helping to reduce heat loss and improve energy efficiency.

• Outstanding acoustic insulation – Stone wool naturally absorbs sound, reducing noise transfer between rooms, floors and walls for a quieter internal environment.

• Fire-safe performance (Euroclass A1) – Non-combustible stone wool provides the highest level of fire resistance, contributing to safer domestic and commercial buildings.

• Versatile for multiple applications – Suitable for timber frames, metal stud walls, internal partitions, pitched roofs, separating floors and more.

• Sustainable & recyclable – Made from natural volcanic rock and manufactured through environmentally responsible processes, with high recyclability.

Applications
ROCKWOOL Flexi® Slab is ideal for:

• Pitched roofs and loft areas

• Timber or metal stud wall partitions

• Internal walls and separating floors

• Refurbishment and new-build projects

• Areas requiring precise fit, long-lasting performance and reduced noise transfer

Why choose Flexi®?
Flexi® is designed to stay in place, even as buildings settle or timber frames shrink. The slab’s flexible edge ensures continuous contact with studs, helping prevent cold spots, sound leaks and insulation slippage. Combined with stone wool’s natural fire, thermal and acoustic benefits, Flexi® offers long-term performance and reliability.