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Steico Therm Woodfibre Internal Insulation Board - 1350 x 600 x 20mm

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Steico Therm rigid insulation board is made from natural wood fibres and is suitable for masonry, brick and solid wall applications.

Easy and fast fixing wood fibre board with superior insulating properties in both summer and winter. High compressive strength, water vapour open (helps regulate the indoor climate of a building) fire resistant.

The board has a light side (machine sanded in the factory) and a darker unsanded side, the lighter side is the plaster carrying face.

Steico Therm is water vapour open, which means that water vapour can pass through it without hinderance. If you have a house built with lime mortar, this can be a critical factor in deciding which insulating materials you need to use to insulate your house.

Steico Therm Specifications

Length: 1350mm
Width: 600mm
Thickness: 20mm
Thermal Conductivity: 0.038 W/mK
Fire Class: E - EN 13501-1
Material: Wood fibre, bond between layers


  • High compression strength
  • High heat protection during summer months
  • Excellent insulation qualities
  • Water vapour open
  • Helps to regulate indoor climates
  • Eco-friendly insulation board
  • Recyclable
  • Accredited heat insulation material


Length 1350mm Thickness 20mm Width 600mm


Thermal Conductivity 0.038 W/mK Edging Square Edge Material Wood Fibre

Questions & Answers


Hi. How do in join two boards that butt against each other?


I would suggest getting in touch with the manufacturer for this answer. (steico)


What adhesive would you use to fix to bare stone?


For something like this, adhesive wouldn't be recommended for fixing this product to a stone wall at all.

My suppliers for this product in particular recommend the use of Mechanical Fixings (Screws) to be used, as they are secure enough to keep the boards in place safely.  


Can I use this in place of Chipboard etc for boarding my loft? Is it strong enough to take a person's weight?


I would not recommend the use of these to take weight in any form, I would still recommend them to go between the joists, and still board over the top of the joists with Ply. These Steico Therm boards are not designed to be load bearing.

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