With exceptional fire resistance and energy efficiency for homes, this stone wool insulation solution ideal for residential extensions and renovations.

This high-performance insulation is designed for masonry cavity wall constructions, providing a full fill solution that effectively safeguards families while reducing energy costs. Its Euroclass A1 Reaction to Fire rating ensures unparalleled safety, making it a reliable choice for both external and separating walls. The semi-rigid composition of these batts allows for easy cutting and friction fitting, ensuring a snug installation with minimal gaps. This not only enhances thermal insulation but also provides excellent acoustic protection for party walls between dwellings. With a thermal conductivity of 0.037 W/mK and BBA approval, ROCKWOOL Thermal Insulation Cavity Batt ensures a robust and efficient insulation solution, contributing to a comfortable and secure living environment.

  • Size: 1200mm x 455mm, covering 3.28m²
  • Thickness: 100mm
  • Lightweight and easy to handle during installation
  • Suitable for external, cavity, and internal walls
  • Provides fire resistance with Euroclass A1 rating
  • Thermal conductivity is 0.037 W/mK
  • Improves acoustic protection in party walls
  • Cut to size and friction fit for minimal gaps
  • BBA approved for reliable performance

£4.99 Standard Delivery, or FREE on most orders over £99* (some exclusions apply)

£9.99 Next day delivery is available for orders places before 12 noon. Any orders placed for next day delivery after this time, will take 2 working days to be delivered.

Working/delivery days are Monday to Friday, deliveries will not normally be made Saturday or Sunday.

We offer a 30-day returns policy on on the majority of our items*, as long as the item is unused, undamaged and unopened**. We only ask that the postage is covered by yourself. 


* Please see our delivery page for further details on specific exceptions.

** Some products that are made to order or personalised cannot be returned.

***Exclusions apply for items shipped directly from our suppliers, and some big & bulky items may incur an additional charge. Please see our delivery page for full details. 

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Rockwool 100mm Thermal Insulation Cavity Batt 1200mm x 455mm 3.28m2

  • £28.09
  • (Delivery from £10.86 )
Item in Stock   |   Usually dispatched within 24 hours
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Free UK Delivery on most orders over £99
Delivery Rates & Information

Delivery Options

Standard Delivery: £4.99 - Free for all orders over £99.*
Next Day Delivery: £9.99 - Available for orders placed before 12:00 PM (Noon).

Important Delivery Notes

Next Day Delivery Cut-off: Orders placed after 12:00 PM (Noon) using Next Day Delivery will be delivered within two working days.
Working Days: Our standard delivery and shipping days are Monday through Friday. We do not normally deliver on Saturdays or Sundays.

Easy 30-Day Returns

We want you to be happy with your purchase! We offer a 30-day returns policy on all items, provided the following conditions are met:
  • The item is unused and undamaged.
  • The item is returned in its original packaging.
  • The customer is responsible for the return postage costs.

Combining Your Order

We always strive to combine your order into a single delivery. However, your order may arrive in multiple shipments if it contains:
  • Items from different warehouses (Standard items).
  • 'Direct' items (These are shipped separately and directly from the supplier) and will arrive separately from other items in your order.

*Exclusions & Additional Charges

The following items may be excluded from standard shipping rates or may incur extra delivery charges:
  • Items Shipped Directly from Suppliers ('Direct' items).
  • Certain Large or Bulky Items.
Want it by Thursday 15th October? Order within 3 days, 11 hours, 26 minutes