How to choose the correct Treated Pine H Rating for your project.
I needed to purchase some treated pine for 2 different projects. One was for some internal framing, which I wanted to protect against termites, and the other was for a gate post which would be outside and in the ground.
After talking with my local timber merchant I found I needed “H2 treated pine” for the internal and “H4 treated pine” for the outside gate post.
An explanation of the Treated Pine – “H” rating.
The “H” stands for “Hazard” and there are 6 main levels of Hazard Treatment in treated Pine.
UPDATE: The additional of Hazard Levels H2F, H2S and H3A have been sourced from the Timber.net.au Australian Timber Database.
Here is a simplified list of the different “H” ratings and their applications:
- H1 Treated Pine : To be used indoors, above the ground. Not resistant to termites.
- H2 Treated Pine : To be used indoors, above the ground. Resistant to termites.
- *H2F : Same as H2. You see this in the Blue Construction Pine.
- *H2S : Same as H2. You see this in LVL/Plywood.
- H3 Treated Pine : To be used outside, above the ground. Resistant to termites.
- H4 Treated Pine : To be used outdoors, in ground or ground contact. Resistant to termites.
- *H3A : Same as H3. Used in Facia boards, doors etc that are maintained with regular painting.
- H5 Treated Pine : To be used outdoors, in ground with water contact. Resistant to termites.
- H6 Treated Pine : To be used when in constant contact with salt water.
Hope this clears things up a bit when deciding on the treated pine you need for your next DIY project. Make sure to ask your timber merchant for a more in depth description and application for each type.