Rockwool Flexi 90mm x 600mm x 1200mm Insulation 4.32m2

£48.96 £40.80
In stock
Product Description

Rockwool Flexi 90mm is a multi-purpose mineral wool insulation solution with a patented design. The unique flexible edge design makes each slab a perfect fit between joists, so you can install it on roofs, walls, floors, and partitions without cutting and wasting product. This both makes installation more simple and insulation more effective.

Size: 600mm x 1200mm

Pack: 6 Slabs

Other available thicknesses: 50mm, 70mm, 100mm & 140mm

We are happy to help with enquiries, stock availability or any technical help you require, however for security reasons we cannot take orders over the phone. So if you need to chat give us a call on 03301231761 or email us at [email protected].

What is Rockwool Flexi 90mm?

Rockwool Flexi 90mm is one of the most effective and versatile insulation slabs which has thermal, acoustic, and fire-resistant properties. Insulate your building, reduce noise, and increase fire safety with one insulation product. Rockwool Flexi 90mm has lifelong durability – once it is installed in your building, you don’t need to maintain it. Plus, it is produced from eco-friendly materials. Rockwool Flexi has earned a rating of A1, the highest rating in fire resistance, making it non-combustible.


As well as outstanding noise and vibration absorbency, Rockwool insulation is rot-resistant and can withstand mildew – it has both water-repellant and temperature-resistant qualities.

Features and benefits of Rockwool Flexi 90mm:

  • The unique design ensures an accurate fit and won’t require cutting or waste.
  • Low maintenance insulation which is easy to install.
  • The slab expands into wider spaces after installation which provides outstanding insulation.
  • Rated A1 making it incredibly fire-resistant.
  • Multi-functional with acoustic, thermal, and fire-resistant insulation.
  • Comes in different thicknesses.
  • Is rot-resistant and can withstand high temperatures.

Applications for Rockwool Flexi 90mm:

  • Pitched roof rafters
  • Framed external walls
  • Internal timber or steel partitions
  • Internal frame ceilings
  • Intermediate floors
  • Separating walls and floors
  • Timber suspended ground floors
  • Party walls

Find out more on Rockwool insulation and how it is made.

Data Sheet (2.98 MB)
Customer Questions
What is Rockwool insulation and how is it made?
Rockwool insulation is a stone-based insulation. It is sourced from abundant lava deposits of volcanic rocks which are melted in a cupola furnace like a controlled man-made volcano. As the re-melted lava comes out of the furnace, it is spun, given water repellency treatment and bound together in a wool-like fleece.
Is Rockwool Flexi only to be used in a timber frame?
Rockwool Flexi slab is an effective thermal and acoustic insulator for use throughout the structure. This could be in pitched roof rafters, framed external walls, internal partitions, intermediate floors, separating walls and floors, and timber suspended ground floors. The flexible edge makes the product a particularly good solution in a timber frame as it helps to overcome the issue of timber shrinkage/expansion by filling the space left behind.
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More Information
Supplier Part Number123324
Pack Size6
Size600mm x 1200mm

Orders and Delivery

Free delivery if your order is over £300 ex VAT. Orders between £100 - £300 ex VAT will be subject to a delivery charge of £50 ex VAT. Please note, we are unable to accept orders less than £100 ex VAT

When ordering on line you can specify the date of delivery, however we would not be able to specify the time of delivery on that day.

• Please note that we have a number of large vehicles, including articulated vehicles that may be used for delivery. Please advise us in the comments on your order if access to the delivery address is limited.

• Due to insurance guidelines, delivery personnel are unable to enter private residences. Delivery will be as far as possible to the kerbside of the delivery address. The recipient of the products is responsible for any additional lifting once the delivery has been made. Please bear in mind that Insulation products can be bulky and / or heavy.

• The delivery driver will require a signature to confirm the goods have been received.

 † Unfortunately we, Insulation Express, cannot deliver to the Highlands & Islands of the UK. However we will be happy to deliver to a freight forwarding company on your behalf.


Returns and Refunds

In the unlikely event that you need to return an item, please contact our team on [email protected] within 14 days of accepting delivery of the item.

Restocking charges may apply. We will discuss this with you upon receipt of the cancellation request. Restocking charges will be applied where the products are no longer required AND NOT for goods returned because either defective or damaged.

We usually charge 30% of value (minimum £25.00).

Please note that we cannot accept returns on special orders. Special orders may consist of items sent via third party shipping companies or made to measure products. If you are unsure on whether or not your item is a special order, please contact us on [email protected] prior to placing the order.

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