Knauf Rocksilk® RS100 Building Slab | 1200mm x 600mm | All Sizes

KnaufSKU: IUK01682

Sale price£58.86 

inc VAT

Pay in 3 prices shown are an example only. Total calculated at checkout.

Delivery within 3 - 5 working days

Free Delivery On Orders
Over £599.95 Ex-Vat

Need something quicker?

Contact us on 0300 303 4578
or email here!

Knauf Insulation Rocksilk® RS100 Rock Mineral Wool Slabs: Enhanced Insulation for Superior Thermal and Acoustic Control


Introducing Knauf Insulation Rocksilk® RS100, a robust rock mineral wool slab engineered for exceptional thermal insulation, fire safety, and soundproofing across multiple applications. 

Featuring a high density of 100 kg/m³ and a thermal conductivity of 0.034 W/mK, this product is crafted using eco-friendly ECOSE® Technology, securing a Euroclass A1 fire safety rating.

Key Benefits

  • Multifunctional Insulation: Perfect for a variety of settings including commercial, residential, and industrial buildings.
  • Optimal Fire Resistance: Achieves remarkable fire safety standards with a high resistance to extreme temperatures.
  • Acoustic Efficiency: Delivers superior sound reduction, ideal for environments where noise control is critical.

Available Sizes

Thickness Thermal Resistance Length Width Slabs Per Pack
25mm 0.70m2K/W 1200mm 600mm 12
50mm 1.45m2K/W 1200mm 600mm 6
75mm 2.20m2K/W 1200mm 600mm 4
100mm 2.90m2K/W 1200mm 600mm 3

Product Specifications

Specification Value
Thermal Conductivity  0.034W/mK
Fire Classification A1
Generic BRE Green Guide Rating A+
Vapour Resistivity 5.00 MNs/g.m
Material Rock Mineral Wool
Density 100 kg/m3


  • Thermal Management: Exceptional for managing indoor climate control in floors, roofs, and wall systems.
  • Soundproofing Barriers: Effectively reduces noise transmission in multi-story buildings and between different areas.
  • Safety Enhancements: Provides reliable fire protection in critical areas, supporting overall building safety.

Frequently Asked Questions (FAQs)

What is Knauf Insulation Rocksilk® RS100?

Knauf Insulation Rocksilk® RS100 is a high-density rock mineral wool slab optimized for thermal insulation, acoustic control, and fire protection in a variety of building applications.

What is the difference between Knauf Insulation Rocksilk® RS45, RS60, RS80, RS100 and RS140?

The Knauf Insulation Rocksilk® RS range consists of mineral wool slabs that differ primarily in density, which affects their thermal and acoustic insulation properties. The RS45, RS60, RS80, RS100, and RS140 are all designed for various applications but vary by density and, consequently, by their specific use-cases:

  • RS45 has a density of 45 kg/m3, making it suitable for a broad range of general applications where moderate insulation is needed.
  • RS60 has a density of 60 kg/m3, offering enhanced thermal and acoustic performance suitable for more demanding environments.
  • RS80 and RS100 increase in density and are typically used where higher performance insulation is necessary, such as in industrial applications or where superior fire resistance is required.
  • RS140 has the highest density at 140 kg/m3, providing the maximum level of insulation and fire protection, making it ideal for specialized applications needing the highest performance material.

Each slab type is also available in various thicknesses to accommodate different requirements, ensuring versatility across a range of construction scenarios.

How does Rocksilk® RS100 enhance building safety?

With a density of 100 kg/m³ and outstanding fire-resistant properties, Rocksilk® RS100 meets Euroclass A1 standards, providing significant protection against the spread of fire.

Can Rocksilk® RS100 be used in both residential and commercial construction?

Absolutely, Rocksilk® RS100 is versatile enough for use in residential, commercial, and industrial settings, offering premium insulation and safety features.

What makes Rocksilk® RS100 an eco-friendly choice?

Rocksilk® RS100 is manufactured using ECOSE® Technology, a sustainable binder that is free from formaldehyde and other harmful chemicals, making it a greener choice for insulation.

How does Rocksilk® RS100 improve acoustic comfort?

Due to its high density and effective sound-absorbing properties, Rocksilk® RS100 is excellent for reducing noise transmission, enhancing comfort in spaces that require quiet.


Data Sheet


Order Value Delivery Charge
Up to £200.00 ex-vat £100.00 ex-vat
£200.00 - £599.95 ex-vat £59.95 ex-vat
Above £599.95 ex-vat Free Delivery


Weekend Delivery
Available upon request


Parcel Rates
Delivery charge may vary depending on quantity and volume of your order.
Pricing will be calculated during checkout.


Local Delivery Charge
Within 35 miles of Postcode S63 9BL - Up to £500.00 ex-vat
Delivery Charge £35.00 ex-vat
Please contact us to arrange collections
Tel: 0300 303 4578 | Email:


Delivery charges will automatically be calculated within the checkout process.
Orders are only processed for delivery between 8.00am - 5.00pm Monday to Friday excluding bank holidays.
Moffett offload will be used for large bulky deliveries and only when agreed with you.
Please advise of any access issues on ordering.
Delivery is Kerbside only.
In the unlikely event that your delivery is not correct or damaged please notify us immediately and mark any issues on the delivery slip.


    Where We Deliver

    Delivery Areas

    We have a fleet of FORS delivery vehicles all with Moffett mechanical off loads that deliver nationwide. Sometimes we may use 3rd party carriers for smaller orders.


      Product Delivery Times

      The vast majority of our orders are dispatched within 3 working days, this can however be up to 5 working days, please contact us if you require something urgent.
      Speciality items may take up to 5-7 working days.
      We will contact you with in 24/48hrs of your order been placed to confirm delivery times and dates.

        Enter the width(m) and length(m) of your project below:

        You may also like...

        Customer Reviews

        Be the first to write a review