Menu
Menu
Your Cart

25mm Rocksilk RS45 Universal Insulation Slab Knauf (pack of 20)

25mm Rocksilk RS45 Universal Insulation Slab Knauf (pack of 20)
25mm Rocksilk RS45 Universal Insulation Slab Knauf (pack of 20)
25mm Rocksilk RS45 Universal Insulation Slab Knauf (pack of 20)
25mm Rocksilk RS45 Universal Insulation Slab Knauf (pack of 20)
Guide Price
25mm Rocksilk RS45 Universal Insulation Slab Knauf (pack of 20)
25mm Rocksilk RS45 Universal Insulation Slab Knauf (pack of 20)
25mm Rocksilk RS45 Universal Insulation Slab Knauf (pack of 20)
25mm Rocksilk RS45 Universal Insulation Slab Knauf (pack of 20)
25mm Rocksilk RS45 Universal Insulation Slab Knauf (pack of 20)
Guide Price: £41.63 (£49.96 inc VAT)
Price per m2: £2.89/m2 (£3.47 inc VAT)
5 or more £40.96 (£49.15 inc VAT)
10 or more £40.29 (£48.35 inc VAT)
20 or more £39.25 (£47.10 inc VAT)
  • Product Code: A1-69
  • Delivery Time: 2 - 3 working days
  • Brand: Knauf
  • (Tech. support: 08000304135)
  • Model and Size: 1200x600 - 14.4m2
  • Weight: 16.20kg
Our ratings on 19-09-2025:
Google My Business Reviews
4.8 out of 5
Show other thicknesses

25mm Rocksilk RS45 Universal Insulation Slab Knauf (pack of 20)

Width: 600mm
Length: 1200mm
Pack Quantity: 20
Pack Coverage: 14.4m2
Density: 45kg/m3
Weight/m2: 1.13kg
Weight: 16.2kg
Thermal Conductivity: 0.035W/mK
R-Value: 0.7m2K/W
Fire Rating (Reaction to Fire): A1(Non-combustible)

25mm Knauf Rocksilk RS45 Universal Insulation Slab is a high-performance mineral wool insulation product suitable for a variety of applications. Manufactured from rock mineral wool using Knauf's unique bio-based ECOSE Technology binder, it provides excellent thermal and acoustic insulation properties. The mineral wool construction offers higher levels of sound absorption and reduction than other mainstream insulants. The slab has a higher density and a good thermal conductivity, helping to improve the energy efficiency of buildings and reduce heating and cooling costs. Knauf Rocksilk RS45 is non-combustible with Euroclass A1 reaction to fire classification, and the rock mineral wool has a melting temperature of over 1000°C to provide longer periods of fire resistance than other mainstream insulants. Knauf Rocksilk RS45 is also resistant to mould, mildew, and vermin, ensuring long-lasting performance and durability. Knauf Rocksilk RS45 is easy to cut and install, making it a versatile choice for insulating walls, floors, and roofs in both new build and refurbishment projects.

APPLICATION

Rocksilk RS45 Universal Slabs are used for a wide range of thermal and acoustic insulation applications in buildings, building services, and industry. This product can be used for insulating:
  • Internal partitions
  • Between timber and metal studs
  • Rafters and floor joists

CHARACTERISTICS

  • Manufactured from rock mineral wool using Knauf's bio-based ECOSE Technology binder
  • Provides excellent thermal and acoustic insulation performance
  • Mineral wool construction offers higher levels of sound absorption and reduction compared to other mainstream insulants
  • Density of 45kg/m³ and thermal conductivity of 0.035 W/mK
  • Non-combustible with Euroclass A1 reaction to fire classification
  • Rock mineral wool has a melting temperature over 1000°C for longer fire resistance
  • Odourless, non-hygroscopic, rot-proof, do not sustain vermin, and will not encourage the growth of fungi, mould, or bacteria
  • Lightweight
  • Easy to cut and install, making it versatile for walls, floors, and roofs
  • Sustainable insulation solution

CERTIFICATION

Manufactured in accordance with:

  • In conformity with BS EN 13162
  • ISO 50001 Energy Management Systems
  • ISO 14001 Environmental Management Systems
  • ISO 45001 Occupational Health and Safety Management Systems
  • ISO 9001 Quality Management Systems


Brand: Knauf Model and Size: 1200x2400mm - 161.28m2
Delivery Time: 1 - 2 weeks
12.5mm Knauf Windliner has been developed for steel infill construction methods. It is a 12.5mm paper-faced gypsum sheathing board, designed to provide protection against the weather for the outer face of the metal stud external wall. Knauf Windliner has a fire and moisture resistant core and is fac..
£1,928.12
£2,313.74 inc VAT
Add to Cart
12.5mm Knauf Aquapanel Exterior Cement Board - 2400mm x 900mm 12.5mm Knauf Aquapanel Exterior Cement Board - 2400mm x 900mm
Guide Price
Brand: Knauf Model and Size: 2400x900mm - 2.16m2
Delivery Time: 1-3 working days
12.5mm Knauf Aquapanel Exterior Cement Board provides a solid, dry base that can withstand the extreme weathering effects of wind, rain, and snow. It makes an ideal substrate for directly applied render finishes and can be used for exterior walls in ventilated systems, exterior ceilings, and soffits..
Guide Price: £60.25
£72.30 inc VAT
Get Best Price
Brand: Knauf Model and Size: 600mm x 1200mm - 0.72m2
Delivery Time: TBC
32mm Knauf Gifafloor 18 is a high performance high density gypsum fibreboard floor panel used to create raised floors over pedestals with incredible strength. it is a high-quality, interlocking tongue and grooved floor board system bonded together to form a flat screed like surface. Knauf Gifafloor ..
Get Best Price
100mm Earthwool Acoustic Insulation Roll Knauf (Split 3 x 400mm) - Pallet of 24 100mm Earthwool Acoustic Insulation Roll Knauf (Split 3 x 400mm) - Pallet of 24
Guide Price
Brand: Knauf Model and Size: 9.17m x 1.2m - 264.00m2
Delivery Time: 3 - 5 weeks
100mm Knauf Earthwool Acoustic Insulation Roll is a high-performance, sustainable insulation solution designed to provide excellent acoustic and thermal performance. Manufactured from renewable and recycled materials, this insulation roll is split into two 600mm wide sections, making it easy to inst..
Guide Price: £2,980.30
£3,576.36 inc VAT
Get Best Price
Brand: Knauf Model and Size: 1200mm x 600mm - 11.52m2
Delivery Time: 3 - 5 weeks
60mm Knauf Earthwool Timber Frame Party Wall Slab is a high-performance insulation solution specifically designed for use in timber frame party walls. This product is manufactured using Knauf's innovative Ecose Technology, which incorporates sustainable materials and a unique binder that significant..
£1,266.00
£1,519.20 inc VAT
Add to Cart
150mm Knauf  DriTherm Cavity Slab 34 Super (pack of 5) 150mm Knauf  DriTherm Cavity Slab 34 Super (pack of 5)
Guide Price
Brand: Knauf Model and Size: 1200x455mm - 2.73m2
Delivery Time: 2 - 3 working days
150mm Knauf DriTherm 34 Super Cavity Slab is a high-performance insulation product specifically designed for use in external full-fill masonry cavity walls. These water-repellent glass mineral wool slabs provide exceptional thermal performance, making them an ideal choice for enhancing energy effici..
Guide Price: £62.39
£74.87 inc VAT
Get Best Price
This product is listed in the following categories and systems (click to show).