TALKING TIMBER
"Treated timber is used for a
multitude of purposes in the
construction industry. Make
sure your timber is correctly
treated, and it will serve you
for decades to come"
– Bertus Coetzee, Dolphin Bay MD
HAZARD CLASSES
• Hazard Class 1 (Interior) refers to timber for use
inside – joinery, floorboards, ceilings and
mouldings. This wood is protected only from
certain commonly occurring insects in a mild
treatment process. All the higher hazard classes
offer protection against insect and fungal attack.
In South Africa, all wood is treated according to
Hazard Class 2 or higher category.
• Hazard Class 2 (Low Hazard – Internal) refers to
wood for interior use only such as structural
timber, roof trusses, laminated beams, ceiling
boards, flooring, panelling, skirtings and
cupboards and give protection against insect and
fungal attack. For these purposes, either
Permacure CCA or Permabore Boron are
appropriate.
• Hazard Class 3 (Moderate Hazard – Exterior
Above Ground) refers to wood used outside but
above the ground, which is at risk of insects and
fungal attack. This includes balustrades, some
decking, beams, garden furniture, log home
exteriors and cladding, gates and fascia boards.
For this hazard class, use Permacure CCA.
• Hazard Class 4 (High Hazard – Ground Contact) is
timber in contact with the ground, which include
playground structures, agricultural poles, other
forms of fencing, pergolas, decking, bridges and
stakes. This timber needs to be particularly
resistant to rotting and termite attack. Permacure
CCA is suitable for all these purposes.
• Hazard Class 5 (High Hazard – Freshwater)
applies to timber that is exposed to continual
moisture or is planted in wet soil, which includes
shade-netting poles, telephone poles, slipways,
retaining walls, walkways, drains and jetties.
Permacure CCA provides long-term protection for
this hazard class.
• Hazard Class 6 (High Hazard – Marine) uses CCA
with creosote for this purpose to offer protection
against marine borers such as jetties, slipways,
retaining walls and walkways.
www.timberiq.co.za
// JUNE / JULY 2019 45