Treated pine framing: is it enough to keep termites out of your house?
Treated pine framing is a sound choice for a dry wall. It is not a termite barrier, and a framed house still needs inspecting.
Most treated pine framing is H2, and that has a limit
Treated pine framing is structural softwood, usually studs, plates and joists. It has been treated to hazard class H2. That class suits timber used inside, above ground and kept dry. It targets mainly the borers that attack pine sapwood, and it gives some protection against termites too.
The class matters because the framing is hidden. Once the lining goes on, nobody sees it again for decades. So the treatment has to do its job quietly.
What the treatment actually covers
The preservative sits in the outer layer of each piece. Wood that has taken up the treatment is a poor meal. That is useful, but three limits apply.
- Cut faces are open. Every notch, drilled hole and cross cut exposes wood the preservative did not reach. These faces need an approved end-cut preservative.
- Wet framing is a different problem. H2 is meant for dry timber. If a leak or poor drainage keeps it damp, decay can set in and softened wood is easier for termites to use.
- Termites can still arrive. They can build mud tubes up a slab edge or a pier and reach framing, or untreated timber next to it, without eating treated wood at all.
Framing is one layer, not the plan
Protection for a house comes from a termite management system installed to AS 3660 and kept up with regular inspection by a licensed timber pest technician. Treated framing sits behind that, as a supporting layer. Do not let it talk you out of the inspection.
If you are building, ask your builder to confirm the framing class on the plans and to keep the stamps. If you are buying an older house, ask what the frame is made of. Some older frames are untreated pine or hardwood, and that changes how much weight the inspection has to carry.
Treated pine or steel framing?
Steel framing cannot be eaten, and that is a real advantage. It does not make the house termite proof, because the doors, trims, skirting boards and cabinets are still timber. Pick the frame on its building merits. Do not choose it as a termite cure.
What to do if you see signs in a framed wall
Mud tubes, hollow-sounding timber or frass near a wall mean you should stop. Do not break the tubes, probe the frame or spray anything. Disturbing the colony can push it out of sight, and the damage then carries on where nobody is looking. Book a licensed timber pest inspection and leave the evidence as it is.
For the basics of the product, see what is treated pine. For the class system, see H3 vs H4 timber.
Frequently asked questions
What hazard class is treated pine framing?
Most framing is H2, which is for timber used inside, above ground and kept dry. Check the stamp on the board or the plans, because the class depends on where the piece is used.
Is treated pine framing termite proof?
No. The treatment makes the wood less attractive, but termites can build mud tubes to reach framing or nearby untreated timber. A management system and regular inspection are what protect the house.
Do I need to treat cut ends on framing?
Yes. Cuts and drilled holes expose wood the preservative did not reach, so apply an approved end-cut preservative and follow the label.
Should I choose steel framing to avoid termites?
Steel cannot be eaten, but the rest of the house still contains timber. Choose framing for building reasons and keep up the inspections either way.
Sources
What this page explains is based on these official sources. If you check one and it does not match what you read here, send it to us and the article gets corrected.
- Standards Australia. Australian Standards (AS 3660 termite management, AS 4349.3 timber pest inspection)
- Queensland Building and Construction Commission. Protect against termites — termite management systems and inspections