The Rockwool Rainscreen Duo Slab is an advanced stone wool insulation solution designed for use in ventilated cladding systems and sealed systems, such as curtain walling. Measuring 1200mm x 600mm, this dual-density slab delivers exceptional thermal insulation, fire resistance, and acoustic performance.
Its unique dual-density construction features a high-density outer surface, providing a robust and stable fixing point, while the flexible underside adapts to uneven surfaces, ensuring a smooth installation. Additionally, the outer layer is treated with a factory-applied water-repellent agent, offering enhanced resistance to rain during construction. With a Euroclass A1 fire rating (non-combustible), it is ideal for projects requiring high levels of fire safety.
The Rainscreen Duo Slab also boasts proven acoustic performance, reducing airborne noise transmission by up to Rw 62 dB. It is Quiet Mark accredited, ensuring superior soundproofing in both residential and commercial applications.
Key Features:
-
Dual-density construction for enhanced durability and secure fixings
-
Euroclass A1 fire rating for maximum fire safety
-
Water-repellent outer layer to prevent rain ingress during construction
-
Proven acoustic performance with sound reduction up to Rw 62 dB
-
Dimensions: 1200mm x 600mm
- Compliant with BS EN 13162 and BBA certified
Applications:
- Ventilated facades
- External wall systems
- Curtain walling
- Residential and commercial buildings
Rockwool
Building Materials
- 50mm (5.76m2 Per Pack)
- 60mm (4.32m2 Per Pack)
- 75mm (4.32m2 Per Pack)
- 100mm (2.88m2 Per Pack)
- 125mm (2.88m2 Per Pack)
- 150mm (2.16m2 Per Pack)
- 180mm (2.16m2 Per Pack)
Delivery is free to Mainland England and Wales. Deliveries are chargable to Scotland.
Once the order is placed, our courier will call you within 3 working days to arrange a delivery date. If you do not hear from the courier within 3 days, please get in touch with us. The majority of deliveries are made within 7 days, occasionally a little longer during peak periods.
Deliveries are made between 08:00 and 18:00 on the day, we request the driver calls you one hour before with an advised time.
Delivery is made via a kerbside tail lift lorry, we cannot deliver to sloping ground as the tail lift must be able to lay flat.
The road must be wide enough for a lorry to fit down and free from obstruction, if there are any access restrictions, please contact us.
Deliveries must be signed for, please report any damages to us within 24 hours.
We offer all bricks with a tail lift offloading service, Please familiarise yourself with the information below.
Crane offloading is available as a premium service for some bricks.

All of our C16 and C24 graded timber is regularised
Regularised timber is timber that has been processed to have a uniform shape and size. This means that the wood has been sawn and planed to remove any irregularities and ensure that each piece of wood has consistent dimensions. Regularised timber is often used in construction, particularly in the framing of buildings, as it is easier to work with and can be more efficiently installed than irregularly shaped timber.
We have one of the largest ranges of timber lengths, dimensions and grades available to buy online.
The variation you require will determine the exact lead time and delivery method.
Most orders arrive within 3-4 days, the maximum is 7 days. Please get in touch before you order if you need a specifc delivery date.
Delivery charges vary by postcode. To find out the delivery charge, add the item(s) you require to your basket and select CALCULATE SHIPPING at the bottom of the page.
Some orders are delivered on our own vehicles based in Leicestershire and Cheshire. We also use carriers including Yodel and Tuffnells. For some sizes and locations we use regional distributors.
If you'd prefer crane offloading rather than tail lift vehicle offloading for your brick order then this service is available for the majority of bricks that we sell. Charges are shown at checkout.
For deliveries of less than 6 packs then Taillift offloading is normally a more cost effective option
Downloadable information can be found here:

Armstrong Cheshire supply the full range of Catnic Lintels. If you don't see the lintel you need on our website, choose from the Catnic Lintel Selector Brochure and give us a call 01625 322269
Downloadable information can be found here:
The Rockwool Rainscreen Duo Slab is an advanced stone wool insulation solution designed for use in ventilated cladding systems and sealed systems, such as curtain walling. Measuring 1200mm x 600mm, this dual-density slab delivers exceptional thermal insulation, fire resistance, and acoustic performance.
Its unique dual-density construction features a high-density outer surface, providing a robust and stable fixing point, while the flexible underside adapts to uneven surfaces, ensuring a smooth installation. Additionally, the outer layer is treated with a factory-applied water-repellent agent, offering enhanced resistance to rain during construction. With a Euroclass A1 fire rating (non-combustible), it is ideal for projects requiring high levels of fire safety.
The Rainscreen Duo Slab also boasts proven acoustic performance, reducing airborne noise transmission by up to Rw 62 dB. It is Quiet Mark accredited, ensuring superior soundproofing in both residential and commercial applications.
Key Features:
-
Dual-density construction for enhanced durability and secure fixings
-
Euroclass A1 fire rating for maximum fire safety
-
Water-repellent outer layer to prevent rain ingress during construction
-
Proven acoustic performance with sound reduction up to Rw 62 dB
-
Dimensions: 1200mm x 600mm
- Compliant with BS EN 13162 and BBA certified
Applications:
- Ventilated facades
- External wall systems
- Curtain walling
- Residential and commercial buildings
Rockwool
Building Materials
- 50mm (5.76m2 Per Pack)
- 60mm (4.32m2 Per Pack)
- 75mm (4.32m2 Per Pack)
- 100mm (2.88m2 Per Pack)
- 125mm (2.88m2 Per Pack)
- 150mm (2.16m2 Per Pack)
- 180mm (2.16m2 Per Pack)
Delivery is free to Mainland England and Wales. Deliveries are chargable to Scotland.
Once the order is placed, our courier will call you within 3 working days to arrange a delivery date. If you do not hear from the courier within 3 days, please get in touch with us. The majority of deliveries are made within 7 days, occasionally a little longer during peak periods.
Deliveries are made between 08:00 and 18:00 on the day, we request the driver calls you one hour before with an advised time.
Delivery is made via a kerbside tail lift lorry, we cannot deliver to sloping ground as the tail lift must be able to lay flat.
The road must be wide enough for a lorry to fit down and free from obstruction, if there are any access restrictions, please contact us.
Deliveries must be signed for, please report any damages to us within 24 hours.
We offer all bricks with a tail lift offloading service, Please familiarise yourself with the information below.
Crane offloading is available as a premium service for some bricks.

All of our C16 and C24 graded timber is regularised
Regularised timber is timber that has been processed to have a uniform shape and size. This means that the wood has been sawn and planed to remove any irregularities and ensure that each piece of wood has consistent dimensions. Regularised timber is often used in construction, particularly in the framing of buildings, as it is easier to work with and can be more efficiently installed than irregularly shaped timber.
We have one of the largest ranges of timber lengths, dimensions and grades available to buy online. The variation you require will determine the exact lead time and delivery method.
Most orders arrive within 3-4 days, the maximum is 7 days.
Please get in touch before you order if you need a specific delivery date.
Delivery charges vary by postcode. To find out the delivery charge, add the item(s) you require to your basket and select CALCULATE SHIPPING at the bottom of the page. Some orders are delivered on our vehicles based in Leicestershire and Cheshire. We also use carriers including Yodel and Tuffnells. For some sizes and locations, we use regional distributors.
If you'd prefer crane offloading rather than tail lift vehicle offloading for your brick order then this service is available for the majority of bricks that we sell. Charges are shown at checkout.
For deliveries of less than 6 packs then Taillift offloading is normally a more cost effective option
Downloadable information can be found here:
Armstrong Cheshire supply the full range of Catnic Lintels. If you don't see the lintel you need on our website, choose from the Catnic Lintel Selector Brochure and give us a call 01625 322269
Downloadable information can be found here:
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Rockwool
Rockwool Rainscreen Duo Slab 1200mm x 600mm
The Rockwool Rainscreen Duo Slab is an advanced stone wool insulation solution designed for use in ventilated cladding systems and sealed systems, such as curtain walling. Measuring 1200mm x 600mm, this dual-density slab delivers exceptional thermal insulation, fire resistance, and acoustic performance.
Its unique dual-density construction features a high-density outer surface, providing a robust and stable fixing point, while the flexible underside adapts to uneven surfaces, ensuring a smooth installation. Additionally, the outer layer is treated with a factory-applied water-repellent agent, offering enhanced resistance to rain during construction. With a Euroclass A1 fire rating (non-combustible), it is ideal for projects requiring high levels of fire safety.
The Rainscreen Duo Slab also boasts proven acoustic performance, reducing airborne noise transmission by up to Rw 62 dB. It is Quiet Mark accredited, ensuring superior soundproofing in both residential and commercial applications.
Key Features:
-
Dual-density construction for enhanced durability and secure fixings
-
Euroclass A1 fire rating for maximum fire safety
-
Water-repellent outer layer to prevent rain ingress during construction
-
Proven acoustic performance with sound reduction up to Rw 62 dB
-
Dimensions: 1200mm x 600mm
- Compliant with BS EN 13162 and BBA certified
Applications:
- Ventilated facades
- External wall systems
- Curtain walling
- Residential and commercial buildings
Size
- 50mm (5.76m2 Per Pack)
- 60mm (4.32m2 Per Pack)
- 75mm (4.32m2 Per Pack)
- 100mm (2.88m2 Per Pack)
- 125mm (2.88m2 Per Pack)
- 150mm (2.16m2 Per Pack)
- 180mm (2.16m2 Per Pack)