The Rockwool SCB is a flexible stone wool cavity barrier designed to help control fire, smoke, heat, and noise movement within external wall cavities. Encased in a durable polythene sleeve, it compresses neatly into place, creating a dependable seal that supports fire safety while also improving thermal and acoustic performance. Made for both horizontal and vertical installation, it offers a simple, robust solution for safeguarding cavity walls in residential, commercial, and multi-storey buildings.

Benefits

Helps slow the spread of fire and smoke through wall cavities thanks to its stone wool core
Compression-fit installation creates a tight seal that reduces air movement and heat loss
Mineral fibre insulation naturally absorbs sound, reducing flanking transmission between internal and external areas
Polythene sleeve protects against moisture and site dirt, maintaining performance during installation
Suitable for masonry, timber frame, and steel frame constructions
Lightweight, flexible, and easy to position around typical cavity wall irregularities
Offers dependable long-term performance without sagging or deterioration
Manufactured from durable, non-combustible stone wool for added peace of mind

Good to Know

Designed for cavity depths from 50 mm up to large-format cavity spaces
Available in multiple widths to match common wall build-ups
Can be installed both horizontally and vertically to maintain continuous fire-stopping lines
Compression ensures a snug fit — Joints should meet cleanly to maintain a continuous protective line.
Easily cut using a utility knife; wear gloves and a dust mask when cutting in unventilated areas
Store under cover, off the ground, avoiding prolonged exposure to sunlight and rain
Specialist PPE is not required, though a dust mask is recommended if cutting in unventilated areas

Internal Wall Insulation