Dimensions 1200 × 400 mm
Brand

Rockwool

Thickness

50mm

Material Type

Rock Mineral

Pieces Per Pack

24 Packs

Sales Unit

Pallet

Unit Coverage

138.24m2

Manufacturers Reference

123317

Thermal Conductivity

0.038W/mK

Density

33kg/m3

Fire Rating

A1 Non-Combustible

Edge Type

Square

Facing

Stone Wool

Weight (kg/m2)

1.65kg/m2

Product Range

Rockwool Flexi Slab

Special Order Item
Please note this item is a Special Order – see terms and conditions

ROCKWOOL Flexi – 1200 x 400 x 50mm – 138.24m2 pallet

(2 customer reviews)
Delivery In 3 - 4 Weeks
Request your delivery date in checkout
Free Delivery
on orders over £300
+VAT
Pallet of 24 Packs (138.24m2)
Secure your product at this price before the increase

£625.00 ex VAT

In Stock

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Thickness
Special Order Item
Please note this item is a Special Order – see terms and conditions
Stu Cazaly
Stu Cazaly
2024-07-11
Trustindex verifies that the original source of the review is Google.
Excellect service via ordering and email. Quick delivery and great communication with delivery driver. Highly recommended.
Kendo Nagasaki
Kendo Nagasaki
2024-07-09
Trustindex verifies that the original source of the review is Google.
Delivery was correct, well packaged and on time. Driver was very helpful. Overall a great experience. Highly recommend these guys 👍
James Moore
James Moore
2024-07-08
Trustindex verifies that the original source of the review is Google.
Initial impressions : i was dubious of ordering after seeing some of the negative reviews, but equally amused by trade insulation replies....... i was looking at reviews because i'd never heard of the business, but after reading the reviews it became clear that actually the place was not a scam, the goods were arriving however people had not paid attention to tickboxes at checkout or were expecting craned deliveries (again not reading checkout\terms) and leaving their mrs at home to accept the orders i ordered 50mm celotex, and rwa45 insulation it's all arrived on the day they said it would yes i needed to help unload it, but guess what, i ordered it to use it so i fully intended to be handling it anyway and not only that even if i didn't need to help i would have had to move it anyway as they would have just done a kerbside delivery driver was great, he asked if i was comfortable in lifting the pallet of pir off in one go, (if you're not you're an adult, simply say no and open the pack) basically it came from travis perkins and i imagine it will come via other major suppliers too much like most of the online companies..... but because these guys order such large quantities they can pass on the discount and they're responsible for dealing with the the like of the tp if there's an issue summary : Yes i would recommend and yes i will order again
David Marsden
David Marsden
2024-07-07
Trustindex verifies that the original source of the review is Google.
My materials were delivered within the specified delivery window. The delivery guy was very skilled at navigating our driveway and he dropped the materials right at our front door. I’m delighted with the quality of materials and service and I will reorder from Trade Insulations Ltd at the next stage of my renovation.
Piotr Sedecki
Piotr Sedecki
2024-07-04
Trustindex verifies that the original source of the review is Google.
Great service. Arrived on time. Very helpful delivery gentelman. Highly recommend.
ian kiddle
ian kiddle
2024-07-04
Trustindex verifies that the original source of the review is Google.
Good product delivered quickly at a competitive price
*M *
*M *
2024-07-04
Trustindex verifies that the original source of the review is Google.
Recommended supplier! I found Trade Insulations easy to deal with, contactable, transparent on pricing and delivery schedules. Saved to my Favourites!

ROCKWOOL FLEXI is an insulation material that has been designed to improve a buildings thermal conductivity. The Flexi Slab is a multi-use acoustic and thermal mineral wool insulation slab with a distinctive flexible edge along one side of the slab specifically developed using patented technology for quick and simple, perfect friction fit between timber and metal frame systems. Rockwool Flexi provides effective thermal insulation, fire resistance and acoustic performance in all areas of the building. Flexi slabs ensure essential tight fitting for thermal and acoustic reliability between frames in walls, partitions, floors, and roofs, without the need for cutting or waste. The insulation is easy to install and can be fitted between fresh timber, the slabs will expand into the wider space as the timber dries out and shrinks back moving with the frame.

Key features:

  • Unique flexible edge on one side
  • Manufactured with patented flexible edge
  • Ensures a perfect fit between insulation and framework
  • Easy to install
  • Excellent thermal and acoustic performance
  • Easy to handle and install requiring no maintenance
  • Designed to prevents gaps in the insulation
  • Non-combustible
  • Environmentally friendly, with no GWP and ODP potential
  • Helps comply with applicable regulations
  • No waste

Sustainability

Made of renewable volcanic rock, Rockwool Flexi Insulation Slabs are made from 97% recyclable and renewable material and packaging, they are environmentally friendly, and they can lower the carbon footprint of the household. By reducing the level of heat escaping your property you are contributing to tackling climate change and global warming.

Acoustic performance

Rockwool stone wool products work in two distinctive ways to reduce noise, either by impeding the transmission of sound through an element of the structure or by absorption of sound at the surface. The structure of the fibres in Rockwool RW slabs make them ideal for use as a sound absorber, with characteristically high coefficients over a wide frequency range.

Fire resistance

All Rockwool RW slab products, either un-faced or with an aluminium foil or glass fleece on one or both surfaces, achieve an A1 classification in accordance with BS EN 13501-1. Rockwool Flexi Slabs should not catch fire and can prevent the spread of flames.

Rockwool Flexi slabs can be installed in a range of methods. These methods include:

  • Pitched roof rafters
  • Framed external walls
  • Internal partitions
  • Intermediate floors
  • Separating walls and floors
  • Timber suspended ground floors

Safety:
BS EN 13162, ISO 14001
Fire Properties Euroclass A1
Achieves Part E when installed in accordance with ROCKWOOL guidelines

More Information:
Brand: Rockwool Flexi Slab
Length: 1200mm
Width: 400mm, 600mm
Thickness: 50mm, 60mm, 70mm, 90mm, 100, 120mm, 140mm, 180mm
Materials: Mineral Wool
Thermal conductivity: 0.035W/mK, 0.38W/mK
Water vapour resistance: Negligible

Datasheet:

Thickness (mm)Thermal Conductivity (W/mK) Length (mm)Width (mm)Slabs Area Per Pack
500.0381200400125.76
500.0381200600128.64
600.0381200600128.64
700.03810060085.76
900.038120060064.32
1000.038120040062.88
1000.038120060064.32
1200.038120060064.32
1400.038120040041.92
1400.035120060042.88
1800.035120060032.16

When installing Flexi Slabs:

  • Ensure your chosen insulation materials are the correct product for your project and meet the required
  • building regulations.
  • If installing the Flexi Slabs into a wall or floor frame, check whether the structure is 400mm or 600mm wide, and ensure you select the product with the correct width to match.
  • This is just a guide and a building professional, or architect should be consulted before starting any construction works on your property. If insulation is installed incorrectly, this can cost time and money.
  • Protective gear such as clothing, gloves, goggles, and face masks are recommended when installing mineral wool products to avoid irritation to the skin and eyes.
  • The Rockwool Flexi slabs should be stored in a weatherproof environment, if indoor storage is not an option, the relevant weatherproofing materials should be applied to protect the material.
  • Ensure there no potential hazards within the construction space such as electrical wires, work heights, etc.
  • Any damage to the property should be repaired before insulation is installed to ensure the problem does not escalate. An example of this is cracked, split, or eroded wood, and rot, mould, or signs of leaks.
  • A saw and a tape measure are required when installing Flexi Slabs.

Measure the spaces within the frame rafter or joist that you will be applying the insulation. Note that not all sizes of the spacings within the frame will be consistent, particularly within older structures. Each insulation slab should be measured and cut to specifically fit each section of the frame.

Use an insulation saw, or sharp knife with a serrated blade, to cut the insulation to size if required. Do not overcut the insulation. Allow an extra 10mm on both dimensions (width and length) of the insulation, over and above the aperture dimensions.

The density and dimensional stability of ROCKWOOL stone wool allows tight friction to fit. The insulation slabs will not require pinning or fixings unless specifically stated otherwise. To install, simply push the insulation into one side of the structure and let the insulation go so it tightly fits into the other side of the structure and holds in place. Ensure there are no visible gaps, as this will have effects on the thermal performance.

Continue until the frame is full. Off cuts can be kept and used to fill smaller gaps. The project can be completed with the next steps depending on the method and area of insulation.


Dimensions 1200 × 400 mm
Brand

Rockwool

Thickness

50mm

Material Type

Rock Mineral

Pieces Per Pack

24 Packs

Sales Unit

Pallet

Unit Coverage

138.24m2

Manufacturers Reference

123317

Thermal Conductivity

0.038W/mK

Density

33kg/m3

Fire Rating

A1 Non-Combustible

Edge Type

Square

Facing

Stone Wool

Weight (kg/m2)

1.65kg/m2

Product Range

Rockwool Flexi Slab

Dimensions 1200 × 400 mm
Brand

Rockwool

Thickness

50mm

Material Type

Rock Mineral

Pieces Per Pack

24 Packs

Sales Unit

Pallet

Unit Coverage

138.24m2

Manufacturers Reference

123317

Thermal Conductivity

0.038W/mK

Density

33kg/m3

Fire Rating

A1 Non-Combustible

Edge Type

Square

Facing

Stone Wool

Weight (kg/m2)

1.65kg/m2

Product Range

Rockwool Flexi Slab

2 reviews for ROCKWOOL Flexi – 1200 x 400 x 50mm – 138.24m2 pallet

  1. Edward

    Great for both thermal and acoustic insulation. Highly versatile product.

  2. Gabriel

    Packaged nicely so easy to handle

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ROCKWOOL Limited is part of the ROCKWOOL Group. Rockwool was founded in 1909 and is a Danish manufacturer with headquarters in Denmark. Rockwool is a leading manufacturer of mineral wool and insulation materials. Rockwool is the second-largest maker of insulation materials and continues to grow. They have one factory in Bridgend, South Wales, and over 500 employees across the UK. Rockwool also has businesses in over 39 countries and a very large number of employees.

Rockwool Flexi Installation Guide
Rockwool Flexi Datasheet
Rockwool Flexi NBS Specification

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