Introducing Rockwool Flexi, a versatile and high-performance insulation solution designed for optimal fit and function in a variety of construction applications. Engineered with a unique flexible edge, this insulation creates a snug fit against the supporting framework, accommodating both fresh and seasoned timber.

As the timber dries and shrinks, Rockwool Flexi expands to fill the space, ensuring continuous insulation coverage. With Euroclass A1 non-combustibility classification according to EN 13501-1, it offers excellent fire resistance while simultaneously enhancing the thermal and acoustic comfort of your home. Rockwool Flexi is suitable for a wide range of applications throughout the house, making it an ideal choice for pitched roof rafters, framed external walls, internal partitions, intermediate floors, separating walls and floors, and timber suspended ground floors. Designed to meet rigorous safety and performance standards, its thermal conductivity and density make it a reliable and efficient solution for improving energy efficiency and sound insulation. - Euroclass A1 Reaction to Fire rating in accordance with BS EN 13501-1 - Thermal conductivity: 0.038 W/mK (50-120mm); 0.035 W/mK (140mm+) - Classified in accordance with BS EN 13162:2012 - Density exceeds 10kg/m3, compliant with Approved Document E - Ideal for various applications including pitched roof rafters, attic loft floors, and timber/metal stud walls.

  • Size: 1200x600x140mm
  • Coverage: 2.88 m2 per slab
  • Euroclass A1 non-combustible rating
  • Thermal conductivity: 0.035 W/mK (140mm+)
  • Flexible edge for a snug fit
  • Suitable for roofs, walls, and floors
  • Provides thermal and acoustic insulation
  • Certified to BS EN 13162:2012 standards

£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 (1200x600x140mm - 2.88 m2)

  • 55,27 â‚¬
  • (Delivery from 14,55 â‚¬ )
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 Wednesday 14th October? Order within 4 days, 14 hours, 46 minutes