Properly treated pine will last for many years even when in contact with the wet soil.

Make sure that the treated pine is certified with a stamp or label from the AWPB; this assures the quality needed. Never purchase wood without the quality label.

Treated Pine Grading

H1- Inside, above ground, dry
Insect borer (other than termites) hazard.
Framing, flooring, furniture etc,

H2- Inside, above ground, dry
Insect borer and termite hazard
Framing, flooring, trusses

H3- Outside, above ground
Moderate fungal decay and termite hazard.
Decking, fencing, cladding, fascia, window joinery, exterior structural timber

H4- Outside, in ground
High fungal decay and termite hazard
Fencing, greenhouses, pergolas, non-structural and landscaping timbers

H5- Outside, in ground or fresh water
High fungal decay and termite hazard
Retaining walls, building poles, pilings and cooling tower fill, structural or critical applications

H6- Marine water exposure
Marine borers hazard
Marine piles, jetty cross bracing, landing steps, sea walls.