Rockwool Flexi is an innovative insulation solution designed with a flexible edge, ensuring a snug fit between the insulation material and its supporting framework. Its unique flexibility allows it to adapt seamlessly between timber, expanding into larger spaces as the wood dries and shrinks.

This adaptability not only simplifies installation but also enhances its effectiveness across a variety of applications. Renowned for its Euroclass A1 non-combustible rating, Rockwool Flexi offers superior fire safety, making it an ideal choice for homeowners and builders alike. Additionally, it provides excellent thermal and acoustic insulation, contributing to a more comfortable and energy-efficient living environment. Perfect for versatile use throughout the home, Rockwool Flexi is suitable for installation in pitched roof rafters, framed external walls, internal partitions, and various types of floors, including intermediate, separating, and timber suspended ground floors. Its high-density composition, compliant with Approved Document E, ensures long-lasting performance and reliability. Whether you are constructing a new home or upgrading an existing structure, Rockwool Flexi is a reliable choice that meets rigorous safety and performance standards. - Fire Rating: Euroclass A1 non-combustible (EN 13501-1) - Thermal Conductivity: 0.038 W/mK (50-120mm); 0.035 W/mK (140mm+) - Compliance: BS EN 13162:2012 - Density: Exceeds 10kg/m3 (Approved Document E) - Applications: Pitched roofs, attic loft floors, timber and metal stud walls, suspended floors

  • Size: 1200x400x140mm, covering 1.92 m2
  • Suitable for pitched roofs, walls, and floors
  • Engineered with a flexible edge for a snug fit
  • Euroclass A1 non-combustible, ensures fire safety
  • Thermal conductivity: 0.038 W/mK (50-120mm)
  • Enhanced thermal conductivity: 0.035 W/mK (140mm+)
  • Compliant with BS EN 13162:2012 standards
  • Density exceeds 10kg/m3 for acoustic insulation

£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 Flexi Dual Purpose Insulation Slab (1200x400x140mm - 1.92 m2)

  • $46.53
  • (Delivery from $17.88 )
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 4 days, 13 hours, 17 minutes