Construction World Septemer 2017

WOOD CONSTRUCTION

Buying and using preservative treated timber? In South Africa treated timber is required by law to comply with

Cross cut ends All machine, cutting or drilling of preservative treated timber should be done prior to preservative impregnation due to cross cutting etc. It must be treated by liberally applying a suitable paint-on or brush-on remedial or supplemental preservatives (excluding ground contact). How to plant a pole Poles must have proper drainage of moisture that may be absorbed but a wooden pole. A structural engineer must be consulted for detailed structural requirements. Poles intended for planting in the ground must be purchased at required lengths. Never plant a cross-cut end of a treated pole or post into the ground as this will expose the untreated heartwood to fungal and termite attack resulting in premature failure. 

national and compulsory specifications and must bear marking containing the following information:

POLES (Metal marker)

SAWN TIMBER (Ink stamp)

Choose the correct hazard class • H6 – High hazard: prolonged immersion in sea water (marine piling, jetty cross- bracing, landing steps, retaining walls, etc.) • H5 – High hazard: outside in contact with heavy wet soil or in fresh water (piling, substructure for walkways and jetties, vineyards etc.) • H4 – high hazard: outside in ground, subject to periodic wetting and leaching (fencing and structural posts, landscaping, stakes, pergolas, etc.) • H3 – moderate hazard: outside above grounds, subject to periodic wetting and leaching (cladding, decking, stairs, balustrades, log homes, etc.). • H2 – low hazard: inside above grounds, protected from wetting and leaching (roof trusses, framing, panelling, laminated beams, flooring, etc.

South African Wood Preservers Association (SAWPA) The South African Wood Preservers Association (SAWPA) is a non-profit association formed in 1980, by the South African wood preserving industry, primarily to promote timber treatment and treated timber products. Commercially grown timber in Southern Africa is mainly of the Eucalyptus and Pinus species, both of which are not durable. By applying the correct chemicals to these timbers ensures that the timber performs as if it were durable thereby giving predictable long life performance.

Innovative timber fasteners in South Africa For 60 years, Simpson Strong-Tie has been recognised and an innovative manufacturer of high quality

precise countersink adjustment, and a patented auto-advance mechanism. This is designed to deliver speed and accuracy when using screws for many applications. →

construction products across a broad range of products including connectors, fasteners, anchors and repair, protect and strengthening systems.

The company’s success can be attributed to its focus of helping its customers make stronger and safer structures. A customer oriented focus along with a commitment to research and development of new ways for construction has been critical in making Simpson Strong- Tie synonymous with high quality construction solutions. In the past Simpson Strong Tie within South Africa promoted one of its popular tools, the Quik Drive ® auto feed fastening system. The Quik Drive ® systems are ideal for a broad range of fastening applications to increase productivity with quick-loading screw strips,

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CONSTRUCTION WORLD SEPTEMBER 2017