The cork insulation

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Properties and characteristics of the main natural and ecological insulation.

This page is part of the file on natural insulation.

2) Cork

Expanded pure cork comes from the cork oak tree (ideally renewable material) which is used abundantly in the Mediterranean.

C’est une partie de l’écorce de cet arbre. C’est un tissu végétal formé de cellules mortes aux parois subérifiées. Il protège les parties vivantes du tronc et des branches de l’arbre. Sa récolte par « ecorçage », si elle est bien faite, n’entraine pas la mort du chêne! C’est donc un matériaux facilement renouvelable.

Section of a trunk of oak-Liege (source)

Rot-proof, waterproof, fireproof, resistant to attack by insects, rodents, fungi, this is one of the best sound and thermal insulation.

It may be packaged as sheets, plates, or bulk form of granules. It is very simple to implement for externally insulate walls, roofs.

Top notch econological: it may come from recycled cork.

The expanded cork chipboard panels

Rot-proof, lightweight, waterproof, rodent and compression. It is sold in the form of different dimensions and thicknesses of plates and can also be used for sound insulation of walls and floors. A surface coating can be applied directly (painting, plastering, wallpaper ...).

The cork granules (bulk):

It is deposited in the same floor, in the attic or under a floor or a double wall and bound in a lime-cement concrete floors for light.

The cork tiles:

Easy to install, replace cork tile a floor, it is waterproof, soft underfoot, quiet and isolated acoustically better than a floor.

To have already walked on cork slabs, I can assure you that the feeling is nice.

Can be used for the surface to a high traffic (entrances, hallways, bathrooms) or often sprayed with water (bathroom) or in children's rooms to replace the carpet.

Thermal properties:

  • Thermal conductivity: 0,032 (chipboard) to 0,05 (slab) W / m ° C.
  • Thermal resistance for a layer of 10 cm chipboard: 0,1 / 0,032 3,125 = m² ° C / W.. In other words, a cork m2 of 10cm will pass 0,32W (1 / 3,125) per degree of temperature difference.

Cork chipboard is 0,4 / 0,32 1,25 = times better than glass wool. For the same insulation, reduced 25% of thickness is sufficient.

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