Treatment

We are able to offer 2 types of treatment, Vacsol Aqua and Tanalised E.

Preservative Use Class

The choice of treatment depends very much on the eventual end use of the timber, the timber species and consequently, its risk of fungal decay or insect attack.

TANALISED E treated timber is generally used for medium to high risk end use applications, and VACSOL Aqua treated timber is used for low to medium risk end uses.

British and European Standards refer to Use Classes (previously Hazard Classes) for the preservative treatment of timber, based around its eventual end use and its risk of attack. The level of preservative treatment is varied according to the Use Class situation that the timber is exposed to during its life. A greater degree or protection is required as the Use Class increases.

USE CLASS (UC) SUMMARY

UC 1 Internal, dry – for example upper floor joists
UC 2 Internal, risk of wetting – for example tile battens
UC 3.1 Outdoors, coated, above ground – for example window frames
UC 3.2 Outdoors, uncoated, above ground – for example fence rails
UC 4 Direct soil or fresh water contact – for example fence posts
UC 5 Marine use – for example marine pilings
vacvac
Suitable for Use Classes 1, 2 & 3.1
VACSOL Aqua treated timber has been impregnated with VACSOL Aqua preservative, a waterborne product containing biodegradable fungicides and insecticides. VACSOL Aqua treated timber is usually specified for above dpc level construction timbers with a low to medium risk of decay or insect attack.
The Treatment Process...
vac1
1. Vacuum created and timber cells evacuated of air. Vacuum held.
vac2
2. Vessel flooded under vacuum, release of which then forces preservative into the wood cells under atmospheric pressure. Alternatively, low pressure may be applied for more resistant species or to achieve a higher specification.
vac3
3. Second vacuum applied to evacuate timber cells of preservative. Surface wet.
vac4
4. Venting to atmospheric pressure drives surface preservative back into the timber. Surface drip dry.
• Effective long-term protection against fungal and insect attack.
• Designed for use in internal and external building applications above dpc level.
• Timber appearance unchanged (many suppliers use a yellow colour tint for ease of identification).
• Treated using the VAC-VAC double vacuum impregnation process.
• Treatment does not significantly alter the dimensions or moisture content of the timber - ideal for
stress graded material in accordance with BS 4978.
• Conforms to new European Standards for treatment of construction timbers in Use Classes 1, 2 and 3.1.
• Approved by the National House Builders Council (NHBC) and major house builders.
• Approved with the Q-Mark quality mark from the UK Timber Frame Association.

VACSOL® Aqua treated timber can have a service life of 30 and 60 years depending on its end use.
VACSOL® Aqua treated timber must only be used above damp proof course level and out of ground contact.
When VACSOL® Aqua treated timber is used in external building situations, it should be used in conjunction with a maintained and appropriate surface coating.
Any timber surface exposed by cross cutting, drilling, notching or boring should be brushed with VACSELE® end-grain preservative to maintain the integrity of the treatment.
Depending upon the expected in-service moisture content of the timber, different fixings are recommended. Pre and post-treatment gluing of VACSOL® Aqua treated timber is possible using a wide range of glue types.

tan

Suitable for Use Classes 1, 2, 3 & 4

TANALISED E pressure treated timber has been impregnated with TANALITH E, a waterborne product based on copper triazole technology. Copper is derived from recycled sources and triazoles are organic biodegradable biocides, commonly used to protect many of the food crops we eat. TANALISED E pressure treated timber is usually specified for both in and out of ground contact applications where there is a medium to high risk of decay or insect attack.

The Treatment Process...

vac1
1.Timber is loaded into treatment vessel. Initial vacuum is applied - timber cells evacuated of air. Vacuum held.
vac2
2.Cylinder is flooded under vacuum with Tanalith® E wood preservative.
vac3
3. Hydraulic pressure is applied, forcing the preservative deep into the structure of the timber.
vac4
4. Final vacuum extracts excess preservative solution, which is pumped back to storage.
vac4
5. Low pressure inside the timber draws in surface solution when vented to atmosphere. Treated timber is left to dry.
• An established and proven alternative to traditional chromated/copper/arsenate (CCA) treated timber.
• Effective long-term protection against fungal and insect attack.
• Proven performance, widely used and accepted worldwide.
• Appealing natural green colour with excellent colour durability, blending perfectly with nature.
• Impregnated using vacuum pressure technology.
• Conforms to new European Standards and individual countries' national requirements.
• Ideal for general construction, fencing, garden and leisure timber applications.

TANALISED® E pressure treated timber can have a service life of 15 - 60 years depending on its end use.
The colour of TANALISED® E pressure treated timber slowly weathers from an initial green hue to a warm, honey brown and in the longer term to a natural silver grey. If required the colour can be refreshed with a brush-on colour product such as RESTOL® (Tanalith® Green).
Any timber surface exposed by cross cutting, drilling, notching or boring must be brushed with ENSELE® end-grain preservative to maintain the integrity of the treatment.
As TANALISED® E pressure treated timber is a high performance product, it is appropriate to use metal fixings and fastenings that give a comparable service life. Under normal conditions the use of hot dipped galvanised nails, screws and fixings is recommended.