Bigger jobs need bigger timber, and that’s exactly where the 240x45mm section comes in. It’s the same F7 structural grade and H3 LOSP treatment as the smaller sizes in this range, just scaled up for work that needs more depth — think bearers carrying real load, or beams spanning further than a standard 190mm piece can handle. Melbourne’s weather doesn’t do timber any favours, so the LOSP treatment matters here: it fights off rot, decay and termites without leaving that oily residue you get with older CCA stock, meaning you can paint or stain it almost straight away. Builders like it because it’s kiln dried, so it stays straighter and doesn’t twist on you mid-project. If you’re framing a deck, putting up a pergola, or building out a retaining wall that actually needs to hold, this is the section size that gets it done properly the first time.