H2 vs H3 Timber: Which Treatment Level DoesYour Project Need? Choosing between H2 and H3 timber doesn’t have to be confusing. The main thing to remember is where the timber will be used. H2 Timber works best indoors, while H3 timber is built for outdoor exposure. Before starting your next project, make sure the timber treatment matches the environment. It’s a simple decision that can save time, money, and future maintenance. For more information:https://talkmarkets.com/article/h2-vs-h3-timber-which-treatment-level-does-your-project-need-535245