ROCKWOOL has expanded its non-combustible stone wool insulation range for builders and tradespeople by launching two new products – 150mm Thermal Insulation Cavity Slab 32 and 140mm Sound Insulation Slab.

The manufacturer is also introducing more sustainable product packaging across the ROCKWOOL Trade Range in 2024.

A new 150mm thickness of Thermal Insulation Cavity Slab 32 will support builders and tradespeople in meeting the UK's now more stringent thermal regulations, such as Part L 2021 (England). Developed using patented NyRock® technology, Cavity Slab 32 has a 0.032 W/mK lambda rating, making it the lowest lambda stone wool currently available in the UK and Ireland.

Cavity Slab 32 helps installers achieve 'continuity of insulation', as recommended in guidance in Approved Document L 2021, as it can be friction-fitted without precise cutting. The product is also water-repellent and has a Euroclass A1 non-combustible reaction to fire classification.

Further expanding its range, ROCKWOOL has introduced a 140mm version of its popular Sound Insulation Slab, joining 50, 70, and 100mm thicknesses. The new 140mm Sound Slab provides acoustic performance for internal floors, and with a 0.035 W/mK lambda, it can also be used as thermal insulation for external timber frame walls. As with Cavity Slab 32, Sound Slab has a Euroclass A1 non-combustible reaction to fire classification and a flexible edge for easy friction fitting.

Commenting on the launch, Cameron Lee, National Sales Manager Merchants & DIY at ROCKWOOL UK. "Our new products are designed to support builders and tradespeople in addressing the changing needs of homeowners and compliance with legislation.”

In 2024, alongside launching two new products, ROCKWOOL will introduce new-look packaging across its Trade Range. Cameron explained, “At ROCKWOOL, we're continually seeking ways to reduce landfill waste and minimise the use of virgin materials. As a result, our new product packaging contains at least 30% recycled content and is made with less ink making it easier to recycle. We will be rolling out the new packaging throughout the year.”

To support the launch of the new products, ROCKWOOL has also produced a refreshed version of its Trade Application Guide – the ultimate guide to its Trade Range and a helpful sales tool for merchants.

For more information on the new SKUs and to become a ROCKWOOL stockist, visit