What is H2 treated pine and what is it used for?

H2 treated pine is a cheap alternative to hardwood.

It’s very easy to work with, making it great for DIY projects and for specific residential and light commercial construction applications.

This article looks at what H2 pine is and why it’s so popular.

What is H2 pine?

H2 timber treatment is the minimum level of treatment required to protect the timber from attack by insects, including termites.

H2 treated pine can be used in indoor conditions such as framing and flooring.

It is suitable in above-ground well-ventilated areas protected from weather and wetting. It is not suitable for outdoor use.

It also must not come into contact with soil. This is because H2 treated pine has been protected against termite attack but it has not been protected against decay fungi/rot.

What is H2 timber used for?

H2 treated pine is suitable for a range of residential domestic applications such as wall frames, flooring, joinery and other applications where the timber will not be exposed to moisture.

It can also be used in light commercial applications providing the timber is not exposed to the weather.

H2 pine should also be used in areas that are well-ventilated to prevent the development of fungi (which it is not protected against).

H2 treated pine is suitable for above ground use only and should never be used in areas that are expected to come into contact with water or soil. This includes areas such as decks, garden beds or below ground retaining walls.

Can you use H2 treated pine outdoors?

The answer is no.

H2 treated pine is not designed for use outdoors because it needs to be protected from the elements and cannot get wet.

If you intend to build an outdoor structure such as a deck,

How long will H2 pine last outside?

You can somewhat extend the life of H2 Pine with regular maintenance and if it’s in a sheltered position, but you’re still going to have to replace it as it eventually.

The main point here is that H2 treated pine is not a suitable solution for outdoor use.

For projects that will be exposed to the elements, such as decking and landscaping, we would recommend hardwood timber such as Merbau or Spotted Gum.

These species are much more durable outdoors than pine and will last significantly longer if properly maintained.

Alternatively, go with an H3 or H4 treated timber as these are suitable for exposure to the weather or periodic wetting.

What is the difference between H2 and H3 treated pine?

The main difference is that H3 is for outdoor use.

The H3 class of treated pine has a higher hazard rating than H2, and as such is used in conditions where the timber may be exposed to the weather or is subject to wetting from time to time.

It’s also for applications where decay and fungal attack are likely.

Both types of timber protect against termites. They both contain a type of treatment that acts as an insecticide, preventing the damage that termites can do to timber structures.

It’s important to note that no matter what kind of treated pine you choose, H2 and H3 should only be used above ground as neither varieties are suitable for exposure to moisture at ground level or being in contact with the earth.

What’s the difference between H1 and H2 treated pine?

The key difference between the two is that H2 contains synthetic pyrethroid and imidacloprid which protects against termites.

H! timber is treated only with Boroin and therefore only protects against borer.

What’s the difference between H2 and H4 treated pine?

H2-treated pine protects against insects including termites. It is suitable for above-ground, interior use only.

H4, on the other hand, is protected against insects including termites as well as severe decay that can occur from contact with water. It is, therefore, suitable for outside, in-ground use such as fence posts or decking foundations.

What is H2F treated pine?

You may have heard the term H2F treated pine, which is essentially the same thing as the H2 treatment level.

H2F is also known as ‘Blue Pine’, which is what Bunnings call their construction pine.

While the regular H2 pine is treated with synthetic pyrethroid, imidacloprid, and Boron, H2F is treated only with synthetic pyrethroid and imidacloprid.

Another difference between H2 and H2F treatment levels is that Blue Pine can only be used south of the Tropic of Capricorn, whereas regular H2 can be used throughout Queensland.

So if you’re in a southern state, you can use either type of treatment when building your deck or pergola with Bunnings timber products, but if you’re in northern Queensland or further north, stick with regular H2.


Can you burn H2 treated timber?

Do not burn H2 timber. Burning treated timber will produce toxic fumes. Also, do not use H2 timber as firewood or mulch. The chemicals it contains make it unsuitable for these purposes.