Timber iQ August- September 2018 // Issue: 39 | Page 37

FEATURES added by using a sun primer – this is a pre-treatment that will enhance the colour, assist as an anti-fungal treatment and strengthen the UV protection already in the oil. Due to its molecular bonding technology, these products will bond to timbers that are CCA treated, as well as thermal treated timbers,” notes Steenkamp. He adds, “With penetrating oils, the oil is to be applied as soon as the surface appears dry. This will feed the wood but offers little protection against wear and tear. Maintenance requirements may vary, but it could range from monthly to annually. With varnishes, the surfaces need to be lightly sanded and recoated periodically. “Should the varnish start to flake, the surface should be stripped back to raw wood and re-coated as a new surface. This offers good protection against wear and tear, but the maintenance is intense when due to the sanding required, and the drying times between coats. Maintenance may vary and can range between annual to once every two to three years depending on products, wear and tear as well as environmental factors.” Conradie says there are numerous advantages in treating timber with boron-based wood preservatives by using the dip diffusion process instead of the conventional press ure impregnation process, especially in the case of structural sawn timber intended for Hazard Class H2 applications. “Boron-based wood preservatives are substantially cheaper than other waterborne wood preservatives currently available in South Africa. Savings in chemical cost for Hazard Class H2 treatment can be 40% and more. Borates are also the only wood preservatives that can be applied to timber by either conventional pressure impregnation or by simple dip diffusion treatment.” Single Coat Oil-Based Wood Stain Protects, nourishes and colours wood in one easy application TAKING NOTE OF TIMBER PRESERVATION HAZARDS Factors that have bearing on the effectiveness of biological preservation systems: • The biological hazard to which the wood will be subjected in service. • The toxicity of the preservative chemical to the particular wood- destroying organisms which will be encountered. Also, the permanence of the preservative chemical under given conditions of hazard following treatment of the wood. • The penetration and retention of preservative chemical, for example, the extent of the penetration of the preservative chemical into the cross section of the timber and the amount retained in the penetrated zone per cubic metre of the wood. Factors that determine the effectiveness of preservative treatments against weathering and fire: • Natural durability of the wood. • The presence or absence of sapwood. • Variability within and between pieces and species. • Preservative distribution gradient. Timber categories ranging from low to high hazard include: • Interior timbers – indoor framing, linings and joinery. • Exterior timbers outdoors above ground – cladding, barge boards, window joinery, palings, rails and bridge decking. • Ground contact – posts, foundation piles, poles, house stumps, crib walls, landscape timbers, playground equipment, bridge and wharf timbers. • Timber used in fresh water or heavy wet soil – poles for livestock pens, piling and jetties. • Marine timbers – marine piles and sea walls. Can be used on all types of untreated wood for both interior and exterior application Easy to apply in one single coat 1 litre covers up to 50m² Low VOC’s Wide colour range with over 70 colours to choose from Good stock levels and quick turn around time Competitively priced quality product backed by great service Proudly made in South Africa [phone] www.jaxoleum.co.za [email protected] Connect with us // AUGUST / SEPTEMBER 2018 35