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Buyer guidance

Timber-pole product resources

Practical guidance for comparing listed products and preparing an accurate RFQ.

K2, K3, K4 and similar descriptions indicate pole size/class in this catalogue. They are not treatment hazard classes.

Treatment and safe handling

Pressure treatment is what lets pine stand outdoors and in the ground for years. Here is how it works, and what the hazard classes on a quote mean.

How pressure treatment works

  1. Load. Dried timber goes into a sealed treatment cylinder.
  2. Vacuum. Air is drawn out of the cylinder and out of the wood cells.
  3. Pressure. Preservative floods in and is forced deep into the timber.
  4. Fix. A final vacuum removes excess, and the preservative fixes in the wood to protect it against fungal decay and wood-boring insects.

Hazard classes (SANS 10005)

ClassWhere the timber is usedTypical examples
H2Indoors, dry, above groundRoof timbers
H3Outdoors, above groundPergola beams, rails, decking
H4In ground or fresh-water contactFence posts, garden poles
H5In ground or fresh water where failure would be seriousStructural building poles, retaining structures
H6In sea waterJetties, marine structures

Standard items are supplied with the treatment specified for that product. If your project calls for a specific class such as H5 or H6, creosote, untreated timber or SABS-marked product, say so in your quote request and we will confirm before supply.

Working with treated timber

  • Wear gloves, a dust mask and eye protection when sawing or drilling, and cut outdoors.
  • Sweep up sawdust and offcuts, and dispose of them with general waste.
  • Never burn treated timber, offcuts or sawdust.
  • Wash your hands before eating, drinking or smoking.
  • Do not use treated timber where it will touch food, drinking water or animal feed.

Need help matching a product to a specification?

Attach the drawing, schedule, BOQ or tender document to your RFQ.

Start an RFQ
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