From £23.85 + VAT per pack

Thermal and acoustic flexible wood fibre wool insulation – SteicoFLEX

SteicoFLEX flexible wood fibre wool insulation batts are:-

  • high density flexible wood fibre wool (with <7% polyester), great for thermal and acoustic insulation.
  • a simple way to keep your home cool in the summer and warm in the winter.
  • perfect for insulating areas where keeping timbers dry is critical.
  • quick to instal and do not slump over time.
  • highly insulating with a conductivity of 0.036 W/mK.

Product overview

Where is it used?

  • In all timber structures, such as floors, walls and roofs.
  • In internal partitions or suspended floors as sound insulation.
  • Within historic timber frames where keeping the moisture content low is critical.
  • Inside recording studios or other sound insulated structures.

How is it used?

  • SteicoFLEX flexible wood fibre wool is simply pressed in between timbers or laid flat on ceilings.
  • It is designed to be fitted between timbers at 600mm or 400mm centres but if it does need to be cut in any significant quantity then an ‘Alligator saw’ is the best tool for this.
  • It should be cut 5-10mm wider than the void into which it is being fitted so as a snug fit without voids is achieved.
  • SteicoFLEX is not suitable for cavity wall insulation or use in a masonry cavity.
  • To see how to use this product in roofing applications see our guide here – How to install roof insulation
  • To see how to use this product in suspended flooring applications see our guide here – How to install suspended floor insulation

How much will you need?

Each batt is 1220mm long, 575mm wide or 0.7m2. 50mm, 80mm, 100mm and 140mm thicknesses are also available in 385mm widths, see the sizes/quantities tab for more information.

Frequently asked questions

What is their thermal conductivity?

The thermal conductivity of the SteicoFlex 038 is 0.038 W/mK and the density is around 50kg/m³. The thermal conductivity of the SteicoFlex 036 is 0.036 W/mK and the density is around 60kg/m³.

See it in action

Pitched roof insulation

Loft Insulation

Suspended floor insulation

Technical details

Pricing & shipping

This product will require one pallet space and so shipping is likely to cost between £50 and £100, depending on where you live. Contact Us for a more accurate costing.

Thickness [mm]Batts per pack [pcs]Batt dimensions [cm]Coverage per pack [sqm]Packs per pallet [pcs]Pallet dimensions [cm] [LxWxH]Cost – single packCost – pack on full pallets
25231220 x 57.516.138122 x 122 x 250£3.38 - single batt£69.97
40101190 x 57.56.84210122 X 122 X 250£40.40£36.36
5091190 x 57.56.158258122 x 122 x 250£46.32£41.69
6081190 x 57.55.4748122 x 122 x 250£48.47£43.63
8061190 x 57.54.10558122 x 122 x 250£48.47£43.63
10041190 x 57.52.73710122 x 122 x 250£40.40£36.36
12041190 x 57.52.7378122 x 122 x 250£48.43£43.59
14041190 x 57.52.7376122 x 122 x 250£57.71£51.94
16031190 x 57.52.10458122 x 122 x 250POAPOA
18031220 x 57.52.10456122 x 122 x 250POAPOA
20021190 x 57.51.40310122 x 122 x 250POAPOA
22021190 x 57.51.4038122 x 122 x 250POAPOA
24021190 x 57.51.4038122 x 122 x 250POAPOA
5091190 x 37.54.0162512122 x 122 x 250£30.42£27.38
8061190 x 37.52.675512122 x 122 x 250£31.84£28.66
10041190 x 37.51.78515122 x 122 x 250£26.49£23.85
14041190 x 37.51.7859122 x 122 x 250£37.88£34.09

Book your free project consultation

We’d like to hear from you. Call us on 01392 861763 or email us at with any questions or comments.

If you can’t seem to find what you need on our website or you have large quantities of materials to purchase please contact us for a chat and we’ll offer you a more bespoke solution.

We’re normally open from 8.30 am to 5 pm Monday to Thursday, and 8.30 am to 1pm on Friday.