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90mm Rockwool SP120 FireStop Slab (2.6m2/Pack)
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Firestop slab for sealing cavities in masonry and curtain wall construction. Suitable for cavity widths between 50-400mm. 90mm thickness provides up to 120 minutes fire resistance.
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- 8hrs
- 19mins
- 6secs
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Product Overview
Firestop slab for sealing cavities in masonry and curtain wall construction. Suitable for cavity widths between 50-400mm. 90mm thickness provides up to 120 minutes fire resistance.
Delivery & Returns Information
How Our Delivery Works
We work with a nationwide network of trusted suppliers. As a result, items in your basket may be supplied by different suppliers and delivered separately. Where this applies, you'll see multiple delivery charges at checkout. We always aim to group products from the same supplier to keep delivery costs as low as possible.
Delivery Areas & Charges
Delivery charges listed on our website apply to mainland UK, excluding the following postcode areas: AB, CF, DD, DG, EH, FK, KA, KW, KY, IV, LA, LD, LL, ML, NP, PA, PH, SA, SY & TD
If your delivery address falls within one of these postcode areas, we’ll be in touch before processing your order to confirm any additional delivery costs.
Please note: We do not currently offer delivery outside the UK mainland.
Standard (Nationwide) Delivery
| Insulation, Plasterboard and Drylining Products | |
|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £350 | £35 ex. VAT |
| Over £350 ex. VAT | FREE |
| Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £100 | £20 ex. VAT |
| Over £100 ex. VAT | FREE |
| Screws & Fixings and Adhesives & Sealants | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £50 | £5 ex. VAT |
| Over £50 ex. VAT | FREE |
Express Delivery
| Express Delivery - Insulation and Plasterboard & Drylining | |
|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £400 | £50 ex. VAT |
| Over £400 ex. VAT | £35 ex. VAT |
| Express Delivery - Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £300 | £50 ex. VAT |
| Over £300 ex. VAT | £35 ex. VAT |
Returns
We offer a 30 day returns policy on any faulty products.
Key Features
- {{local_fire_department}} Firestop slab
- {{house_siding}} For sealing cavities in masonry and curtain wall construction
- {{width_wide}} Suitable for cavity widths between 50-400mm
- {{shield}} 90mm thickness provides up to 120 minutes fire resistance
Technical Specification
| Thickness: | 90mm |
|---|---|
| Width: | 650mm |
| Length: | 1000mm |
| Pieces Per Pack: | 4 |
| Sales Unit: | Pack |
| Sales Unit Coverage: | 2.6m2 |
| Brand: | Rockwool |
| Manufacturer's Reference: | 124827 |
| Fire Rating: | 120mins |
Technical Downloads
Product Overview
Rockwool SP120 FireStop Slab with a 90mm thickness and total coverage of 2.6 m² per pack. High-density, non-combustible stone wool slab designed to provide firestopping, thermal, and acoustic performance at the junctions of compartment walls and floors.
Engineered for use in curtain walling and cladding interfaces, it offers proven fire resistance and dimensional stability under load and temperature exposure.
Manufactured from molten volcanic rock spun into fine fibres, the slab achieves Euroclass A1 non-combustibility and maintains integrity for up to 120 minutes fire resistance when correctly installed. The robust, semi-rigid structure ensures close friction fit within cavities and movement joints without the need for mechanical restraint.
The 90mm thickness provides optimum fire-stopping depth for high-rise and commercial façade applications requiring maximum fire containment.
Features & Benefits
- Non-combustible performance: Euroclass A1 reaction-to-fire rating provides up to 120 minutes’ integrity and insulation when tested to relevant standards.
- Thermal and acoustic control: Mineral fibre composition delivers consistent insulation and sound absorption performance.
- Dimensional stability: Retains thickness and density under heat, ensuring maintained fire seal integrity.
- Ease of installation: Semi-rigid format allows compression fit without adhesives or mechanical fixings.
- Durability: Unaffected by moisture, rot, or vermin and retains properties throughout building life.
- Thickness: 90mm slab provides full-depth fire and thermal separation at roof or wall junctions.
Applications
- Curtain walling: Installed at the interface between façade panels and floor slabs.
- Compartment walls and floors: Provides fire-stopping in masonry, steel, and concrete constructions.
- Perimeter barriers: Used around openings, penetrations, and façade perimeters to prevent fire spread.
- Service voids and soffits: Suitable for void closures requiring both fire resistance and insulation.
Installation Guidance
- Preparation: Ensure cavity or joint is clean, dry, and free of debris before fitting.
- Cutting: Trim slabs accurately using a long-bladed knife or insulation saw for a tight fit.
- Compression fit: Insert slab under slight compression to ensure complete seal across the gap.
- Joint treatment: Butt edges tightly; apply Rockwool FireStop Compound or coated strip if specified.
- Protection: Keep slabs dry prior to installation and protect from weather exposure.
Compliance & Performance
- Material specification: Rock mineral wool insulation manufactured to BS EN 13162.
- Fire classification: Euroclass A1 non-combustible to BS EN 13501-1.
- Fire resistance: Provides up to 120 minutes integrity and insulation (SP120 rating).
- Thermal conductivity: Approximately 0.037 W/m·K.
- Density: Nominal 80–100 kg/m³ for stable fire-stopping performance.
- Environmental compliance: Recyclable and manufactured with high recycled content.
- Important note: Fire performance is dependent on correct system detailing and installation to tested configurations.
