With pumped or gunned cork
Cork is the most natural insulation in existence . It has a great thermal conductivity index, acoustic absorption, the way it acts with dampness, fire, compression, chemical agents, etc.; it can compete with the most cutting edge synthetic materials and even outdoing them in some cases.
Its properties are a result of the special structure and chemical composition of its cells. Cork has an extraordinary elasticity which means it can be compressed without becoming deformed, going back to its original form.
Regarding performance, its low thermal conductivity should be highlighted as well as its great acoustic insulation. It is chemically inert which means there is no risk in using it. It has a relatively high impermiability rate for air and water thanks to the oily substance that goes through its cell walls and makes up the material.
This is one of the lightest solid materials (its relative thickness is between 0.15 and 0.25) its reaction to fire it’s considerably good (class E). Furthermore, it does not give off toxic gases when it burns, unlike other chemical insulation, given that it is natural.
As insulation, cork has a brilliant life cycle and is environmentally friendly. It last a long time compared to other insulation, it is not affected by insects (suberin is an insect repellent) and is very resistant to chemical agents. It is recyclable and reusable and if it is thrown away it is completely biodegradable.
PIMAT recommends using it for:
- Walls, floors and ceilings for thermal and acoustic insulation and insulation from vibrations.
Cork is sold in sheets, blocks and in grains.
The most commonly used variety is expanded corkboard. This product is obtained from cork granules that stick together due to their natural resin (suberin) without any additives by cooking it in an autoclave.