Rockwool Flexi 140mm x 600mm x 1200mm Insulation 2.88m2

£48.38 £40.32
In stock
Product Description

Rockwool Flexi Insulation 140mm is a market-leading insulation slab designed with a unique patented flexible edge which ensures there is a perfect fit between the product and its supporting framework. Installation for roofs, walls, floors, and partitions is made easy and effective.

Size: 600mm x 1200mm

Pack: 4 Slabs

Other available thicknesses: 50mm, 70mm, 90mm & 100mm

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 140mm?
Rockwool Flexi 140mm insulation slab is made from renewable volcanic rock. With these resin-bonded slabs, you can envelop heat in your building, absorb noise and vibrations, and increase fire safety with one insulation product. Reducing your building’s carbon footprint, this product has a thermal conductivity of 0.035W/mK and is ideal for multipurpose applications, available in various sizes.

Rockwool Flexi 140mm has lifelong durability with zero maintenance after installation. These slabs are fire resistant, earning a classification of A1 non-combustible, which is the highest rating meaning they won’t burn. The unique flexible edge has been designed so you don’t need to cut it and create waste.

Features and benefits of Rockwool Flexi 140mm:

  • Get a perfect fit for maximum insulation efficiency with the patented edge unique to Rockwool.
  • Easy to install with zero maintenance afterwards.
  • The slab expands into wider spaces after installation which doesn’t leave any gaps.
  • Rated A1 making it incredibly fire-resistant.
  • Multi-purpose slab with acoustic, thermal, and fire-resistant insulation.
  • Comes in different thicknesses to choose from.
  • Is rot-resistant and can withstand high temperatures.

Applications for Rockwool Flexi 140mm:

  • 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

Discover our guide on Rockwool insulation and how it is made as well as how to double layer Rockwool products.

Data Sheet (2.98 MB)
Customer Questions
There are water pipes running between some of my floor joists. Can I fit this Rockwool slab around them? How soft is it, can it be moulded around pipes or does it need to be carved?
The Flexi slabs are semi-rigid slabs which retain their shape. This means that they probably aren't flexible enough for this application. If you are looking to soundproof, acoustic roll would be a good option if you are looking to enclose pipes without having to make many cuts to the slabs.
What is the coverage of 1 piece of the Rockwool at 140mm?
The Rockwool Flexi slabs are 600mm x 1200mm, and cover 0.72m2 each. These are sold in a pack of 4 which covers 2.88m2.
Are Rockwool slabs itchy to touch?
While handling, protective clothing should be worn, which includes a face mask and gloves. Small fibers can become dislodged from the product, and can be inhaled or cause iritation to skin.
What is u-value of the 140mm Rockwool Flexi?
Rockwool Flexi has a thermal conductivity of 0.035 W/mK at 140mm thickness and above. The thermal conductivity can be used in conjunction with other parts of the construction to calculate the U Value. You can use the Rockwool U-value calculator by following this link:
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More Information
Supplier Part Number123330
Pack Size4
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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