Rockwool Flexi acoustic and thermal slab Rockwool Insulation

Rockwool Flexi Slabs

Acoustic and thermal building slabs

Dual purpose acoustic and thermal mineral wool insulation with a patented Flexi® edge along one side.

Suitable for a wide range of applications, fitting all stud and joist centers with ease.

Will not slump, even if studs shrink.

Non-combustible – Euroclass A1.

Made from diabase rock, which is a renewable and plentiful natural resource.

Does not contain gases that have ozone depletion potential (ODP) or global warming potential (GWP).

Thicknesses and Availability:

This Rockwool Range includes the following readily available product thicknesses: 50mm, 60mm, 70mm, 90mm, 100mm, 140mm, and 180mm (some thicknesses may only be available in pallet quantities as they will need to be sourced from the manufacturer before being delivered to site).

The following thicknesses are manufactured to order and have minimum order requirements: 120mm (minimum order: 16 x pallets).

Due to supply challenges from the manufacturers, please allow extended lead times on Rockwool products. Please feel free to contact me to check availability and lead times.

Product Information

General information about Rockwool Flexi Slabs

Product Application

Thermal and Acoustic flexi edge Building Slab

Rockwools versatile flexi edge building slab, Rockwool Flexi, is suitable for use in pitched roof rafters, framed external walls, internal partitions, intermediate floors, separating walls and floors, and timber suspended ground floors.

Product Make-up

Core

Durable non-combustable stone wool spun from volcanic rock, resin bonded into slabs

Facings

Unfaced

Product Properties

Thermal Conductivity 0.038 W/m·K (insulant thickness > 140 mm)
0.035 W/m·K (insulant thickness 140 - 180 mm)
Nominal Density approx. 33 kg/m³
Fire Performance Classification A1 BS EN 13501-1
Surface Spread of Flame Non-combustable
Slab Length 1.2m
Slab Width 0.4m and 0.6m
Board Edge Square
Vapour Resistance Negligable

Product Prices

Buy Rockwool Flexi Slabs

The prices and quantity discounts below are 'per pack' rates. Packs contain multiple slabs... 12 x 0.4x1.2m = 5.76m² - in this instance, there are 12 x slabs in a pack where each slab is 0.4m x 1.2m providing a total coverage of 5.76m² per pack.

Rockwool Flexi comes in two slab sizes... 400mm (0.4m) and 600mm (0.6m)

Availability Undetermined - Special circumstances are involved in the supply of these products. Rockwool Flexi 50mm, 24 x (12 x 0.4x1.2m) = 138.24m² - ranging from £3.41 to £3.57 per m²

1 x pallet @ £3.57 per m² / £1.71 per slab = £493.63 (£592.36 inc-VAT) per pallet
2 x pallets @ £3.54 per m² / £1.70 per slab = £489.27 (£587.12 inc-VAT) per pallet
3 x pallets @ £3.51 per m² / £1.68 per slab = £484.90 (£581.88 inc-VAT) per pallet
4 x pallets @ £3.48 per m² / £1.67 per slab = £480.53 (£576.64 inc-VAT) per pallet
5 x pallets @ £3.44 per m² / £1.65 per slab = £476.16 (£571.39 inc-VAT) per pallet
6 x pallets @ £3.41 per m² / £1.64 per slab = £471.79 (£566.15 inc-VAT) per pallet

Availability Undetermined - Special circumstances are involved in the supply of these products. Rockwool Flexi 100mm, 30 x (6 x 0.4x1.2m) = 86.4m² - ranging from £6.46 to £6.76 per m²

1 x pallet @ £6.76 per m² / £3.24 per slab = £583.85 (£700.62 inc-VAT) per pallet
2 x pallets @ £6.70 per m² / £3.21 per slab = £578.69 (£694.43 inc-VAT) per pallet
3 x pallets @ £6.64 per m² / £3.19 per slab = £573.52 (£688.22 inc-VAT) per pallet
4 x pallets @ £6.58 per m² / £3.16 per slab = £568.35 (£682.02 inc-VAT) per pallet
5 x pallets @ £6.52 per m² / £3.13 per slab = £563.19 (£675.83 inc-VAT) per pallet
6 x pallets @ £6.46 per m² / £3.10 per slab = £558.02 (£669.62 inc-VAT) per pallet

Availability Undetermined - Special circumstances are involved in the supply of these products. Rockwool Flexi 140mm, 24 x (4 x 0.4x1.2m) = 46.08m² - ranging from £9.50 to £9.94 per m²

1 x pallet @ £9.94 per m² / £4.77 per slab = £458.23 (£549.88 inc-VAT) per pallet
2 x pallets @ £9.86 per m² / £4.73 per slab = £454.18 (£545.02 inc-VAT) per pallet
3 x pallets @ £9.77 per m² / £4.69 per slab = £450.12 (£540.14 inc-VAT) per pallet
4 x pallets @ £9.68 per m² / £4.65 per slab = £446.07 (£535.28 inc-VAT) per pallet
5 x pallets @ £9.59 per m² / £4.60 per slab = £442.01 (£530.41 inc-VAT) per pallet
6 x pallets @ £9.50 per m² / £4.56 per slab = £437.96 (£525.55 inc-VAT) per pallet

Availability Undetermined - Special circumstances are involved in the supply of these products. Rockwool Flexi 50mm, 12 x 0.6x1.2m = 8.64m² - ranging from £3.25 to £3.40 per m²

1 plus packs @ £3.40 per m² / £2.45 per slab = £29.40 (£35.28 inc-VAT) per pack
6 plus packs @ £3.37 per m² / £2.43 per slab = £29.14 (£34.97 inc-VAT) per pack
12 plus packs @ £3.34 per m² / £2.41 per slab = £28.88 (£34.66 inc-VAT) per pack
18 plus packs @ £3.31 per m² / £2.39 per slab = £28.62 (£34.34 inc-VAT) per pack
24 plus packs @ £3.28 per m² / £2.36 per slab = £28.36 (£34.03 inc-VAT) per pack
30 plus packs @ £3.25 per m² / £2.34 per slab = £28.10 (£33.72 inc-VAT) per pack

Availability Undetermined - Special circumstances are involved in the supply of these products. Rockwool Flexi 100mm, 6 x 0.6x1.2m = 4.32m² - ranging from £6.46 to £6.76 per m²

1 plus packs @ £6.76 per m² / £4.87 per slab = £29.20 (£35.04 inc-VAT) per pack
10 plus packs @ £6.70 per m² / £4.83 per slab = £28.95 (£34.74 inc-VAT) per pack
20 plus packs @ £6.64 per m² / £4.78 per slab = £28.69 (£34.43 inc-VAT) per pack
30 plus packs @ £6.58 per m² / £4.74 per slab = £28.43 (£34.12 inc-VAT) per pack
40 plus packs @ £6.52 per m² / £4.70 per slab = £28.17 (£33.80 inc-VAT) per pack
50 plus packs @ £6.46 per m² / £4.65 per slab = £27.91 (£33.49 inc-VAT) per pack

Availability Undetermined - Special circumstances are involved in the supply of these products. Rockwool Flexi 140mm, 4 x 0.6x1.2m = 2.88m² - ranging from £8.51 to £8.91 per m²

1 plus packs @ £8.91 per m² / £6.42 per slab = £25.66 (£30.79 inc-VAT) per pack
8 plus packs @ £8.83 per m² / £6.36 per slab = £25.43 (£30.52 inc-VAT) per pack
16 plus packs @ £8.75 per m² / £6.30 per slab = £25.20 (£30.24 inc-VAT) per pack
24 plus packs @ £8.67 per m² / £6.24 per slab = £24.97 (£29.96 inc-VAT) per pack
32 plus packs @ £8.59 per m² / £6.19 per slab = £24.75 (£29.70 inc-VAT) per pack
40 plus packs @ £8.51 per m² / £6.13 per slab = £24.52 (£29.42 inc-VAT) per pack

Limited stock of the most popular thicknesses are held at most of our depots. Where we need to bring stock in from the manufacturer, please allow up to 2 weeks for delivery

Please observe the 'Star Rating' indicators to assess availability.
Product Availability Excellent Generally 1 or 2 days for delivery
Product Availability Good Generally 1 to 5 days for delivery
Product Availability Fair Generally 5 to 10 days for delivery
Product Availability Poor Generally 5 to 15 days for delivery
Product Availability Undetermined Please call to check availability and approximate lead times

Product availability depends upon stock levels at closest depot and delivery logistics to geographic locations


Product Performance and Guides

Product Performance, Manufacturer Certification, Downloads, and Installation Guides

Thermal Resistance

While we have provided Thermal Resistance values for all thicknesses on the Rockwool Flexi datasheet, some thicknesses may not be readily available.

Items highlighted in green are generally held in stock at our depots.

Product Thickness Thermal Resistance kg/m³
Flexi (400mm) 50mm 50mm 1.32 m²K/W 33 kg/m³
Flexi (400mm) 100mm 100mm 2.63 m²K/W 33 kg/m³
Flexi (400mm) 140mm 140mm 4.00 m²K/W 33 kg/m³
Flexi (600mm) 50mm 50mm 1.32 m²K/W 33 kg/m³
Flexi (600mm) 60mm 60mm 1.58 m²K/W 33 kg/m³
Flexi (600mm) 70mm 70mm 1.84 m²K/W 33 kg/m³
Flexi (600mm) 90mm 90mm 2.37 m²K/W 33 kg/m³
Flexi (600mm) 100mm 100mm 2.63 m²K/W 33 kg/m³
Flexi (600mm) 120mm 120mm 3.16 m²K/W 33 kg/m³
Flexi (600mm) 140mm 140mm 4.00 m²K/W 33 kg/m³
Flexi (600mm) 180mm 180mm 5.14 m²K/W 33 kg/m³
Minimum order level - £175.00 ex-VAT. For further details on Delivery Charges and Minimum Order levels, please Click Here