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ecoCORK by SecilTek is a product formulated exclusively with Secil Natural Hydraulic Lime binder and free from cement.
Mixed mostly with cork aggregate, ecoCORK provides a lightweight, insulating, vapour permeable and environmentally friendly render or plaster.
Cork is well known for it’s great thermal values and that it comes from a renewable source.
SecilTek ecoCORK Brochure
SecilTek ecoCORK Application Guidance
Uses
Renovation: Stone (Rubble & Dressed Stone), Brick, Cob, Wichert, Clunch and Straw bale.
New Build: Stone, Brick and Block.
Advantages
- Cost effective compared to hemp or traditional lime mortars
- Easy to apply, single coats up to 20-25 mm
- Ready to top coat sooner than traditional lime putty plasters and renders
- Good vapour permeability
- Improves thermal performance of building being rated as T2 under EN998-1
- Improves acoustic performance of building
- 50% lighter than traditional lime mortars
- Reduced CO2
- Reduced consumption of non-renewable aggregates
- High durability
- Resistant to salts
The ecoCORK Plastering System
SecilTek ecoCORK is suitable for internal or external plastering. It is applied on top of a specially formulated consolidating mortar, which is hand harled onto the wall to get a key.
After the consolidating mortar one or two coats of ecoCORK can be applied in thicknesses of 10-25 mm per coat, giving up to 40-50 mm thick plaster or render in total. The surface is floated after a few hours to prepare for the finishing coat. After letting the ecoCORK harden, a final 3 mm coat of Secil finishing mortar is applied or a traditional lime putty plaster can be used internally.
Example U-Values
Thermal performance of traditional buildings are notoriously difficult to calculate, be them made of cob, stone, wattle and daub or whatever. We have therefore provided some examples below of potential thermal performance and improvements, based on extremes of performance. The worse the performance of the original material, the better the improvement when Secil ecoCORK is added as can be seen from the tables below.
Although the thermal performance is not the only consideration when deciding on how comfortable a building will be to occupy, it is important for Building Regulations. The thermal performance therefore needs to be calculated as accurately as the available information allows and aim to achieve the necessary targets where possible.
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Cob walls based on lambda value of 0.40
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Existing structure
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U-Value before
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ecoCORK internally
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ecoCORK externally
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U-Value after
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Improvement
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600 mm
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0.579
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~
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20 mm
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0.525
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10%
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600 mm
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0.579
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~
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40 mm
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0.475
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18%
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600 mm
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0.579
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20 mm
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40 mm
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0.438
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24%
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Cob walls based on lambda value of 0.80
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Existing structure
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U-Value before
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ecoCORK internally
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ecoCORK externally
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U-Value after
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Improvement
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600 mm
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1.023
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~
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20 mm
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0.865
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15%
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600 mm
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1.023
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~
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40 mm
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0.738
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28%
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600 mm
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1.023
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20 mm
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40 mm
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0.652
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36%
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