Superglass Adapt Slab 35 – Flexible Glass Mineral Wool Insulation

Superglass Adapt Slab 35 is a non-combustible glass mineral wool slab designed for fast, accurate friction fit between studs and joists. Supplied in 400 mm and 600 mm widths, it minimises gaps at joints, reduces cutting on site and delivers dependable thermal and acoustic performance across walls, floors and roofs.

Why choose Adapt Slab 35

• Euroclass A1 non-combustible for maximum fire safety and compliance
• λ 0.035 W/mK declared thermal conductivity to cut heat loss and running costs
• Friction fit installation at 400 mm and 600 mm centres to reduce gaps and waste
• Acoustic benefit to help control sound transmission through partitions and floors
• Robust, flexible slab that handles well and keeps its shape in service
• Low environmental impact with up to 84% recycled glass and A+ Green Guide rating

Typical applications

• Light gauge steel framing systems (between studs only)
• Party and separating walls
• Internal stud partitions
• External timber frame walls
• Internal and separating floors
• Suspended timber ground floors
• Warm pitched roofs

Technical details

Product specification

Note: Slabs below are 600 mm wide. 400 mm width is also available for common stud centres.

Standards and approvals

• Manufactured to BS EN 13162:2012+A1:2015 and evaluated to BS EN 13172:2012
• ISO 9001:2015 Quality Management Systems, Certificate FM 02264
• ISO 14001:2015 Environmental Management Systems, Certificate EMS 646508
• UKCA certified to BS EN 13162:2012+A1:2015, Certificate 0086 CPR 469699
• CE marked to EN 13162:2012+A1:2015, Certificate 0751-CPR-399.0-01
• CCPI Assessment Mark, Certificate 005800130/0227
• EUCEB certified fibres, Certificate BEUC-511-27949-491-14462

Environmental credentials

• Manufactured from up to 84% recycled glass
• Generic BRE Green Guide Rating A+
• Contains no ozone-depleting substances or greenhouse gases
• Products and pallets wrapped in LDPE4 with a minimum 30% recycled content and fully recyclable, subject to local guidance

Installation guidance

1. Measure stud or joist centres and select 400 mm or 600 mm slabs for a snug friction fit.
2. Cut cleanly where required and fit tightly with no gaps at edges or corners.
3. Avoid over-compression to maintain declared thermal and acoustic performance.
4. Stagger joints between layers where multiple layers are specified.
5. Follow the project specification for any required linings, membranes or finishes.

All Superglass products are non-hygroscopic, will not rot or degrade, do not sustain vermin and do not encourage mould, bacteria or fungi.

Handling and storage

Supplied compression packed in polythene for short-term protection only. Store indoors or under a waterproof cover, off the ground and protected from weather. Keep slabs clean and undamaged. Do not leave permanently exposed to the elements.

	Adapt Slab 35 – Datasheet – August 2025 – Non-combustible glass mineral wool slabs for thermal and acoustic insulation. Key properties, sizes and performance data for walls, floors and warm roofs. Download The Full Data & Spec Sheet
	Material Safety Datasheet (MSDS) – Glass Mineral Wool Insulation – June 2025 – Safety and handling guidance for glass mineral wool. PPE, first-aid information and storage notes for safe use on site.
	CCPI Schedule of Assessed Products – Timber & Rafter Insulation – Independent record of product claims and supporting evidence. Transparency and accuracy in line with the CCPI framework.
	Installation Guide – Internal Walls & Floors – May 2025 – Step-by-step fitting between studs and joists. Cutting, friction fit and detailing to minimise gaps and maintain performance.
	Installation Guide – Timber Frame Applications – May 2025 – Best practice for timber frame walls and warm roofs. Service penetrations, membranes and junction details to hit thermal and acoustic targets.
	Product Storage and Pallet Guide – May 2025 – Storage, stacking and pallet handling instructions. Protects packs on site and preserves product integrity before installation.
	Environmental Product Declaration (EPD) – Cured Glass Wool Insulation – Issue 04 – Third-party verified lifecycle data. Embodied carbon, resource use and end-of-life information for transparent specification.
	UKCA Certificate – Cured – Evidence of conformity with UK regulations for cured glass wool insulation. Standards, scope and manufacturer identification.
	CE Mark Certificate – Cured – Declaration of performance for European markets. Confirms compliance with EN 13162 for factory-made mineral wool products.
	Robust Detail E-WT-1 – Datasheet – May 2025 – Timber frame separating wall construction detail. Acoustic targets, build-ups and workmanship guidance aligned to the Robust Details scheme.
	Robust Detail E-WT-2 – Datasheet – May 2025 – Alternative timber frame separating wall specification. Layer build-ups, junction treatment and site checks to meet Approved Document E via Robust Details.

Frequently asked questions

Is Adapt Slab 35 non-combustible?
Yes. It is Euroclass A1 which is the highest possible reaction to fire rating.

Will it help with sound?
Yes. The flexible glass mineral wool structure helps reduce airborne sound through stud walls and timber floors when installed correctly.

Can I friction fit it between 400 mm and 600 mm centres?
Yes. It is supplied in 400 mm and 600 mm widths for a tight fit that limits air gaps and waste.

Does it absorb moisture?
No. It is non-hygroscopic and has a nominal vapour resistivity of 5 MNs/gm.

Recommended with this product

• Acoustic sealant for perimeter and service penetrations
• Polythene vapour control layer where specified
• Appropriate fixings and linings for the chosen wall or floor build-up
• Protective gloves and a suitable dust mask during installation

Ready to order or need advice?

Buy Insulation is here to help you choose the right thickness and width for your build, align to spec and get it on site without fuss.

• Friendly product advice and quick quotes
• Guidance on compliance and best practice
• UK delivery options to suit your schedule