HT certification stands for Heat Treatment and is a certification that indicates that lumber has been treated to prevent the spread of pests and diseases. This treatment involves heating the lumber to a specific temperature for a specified period to kill any insects or larvae that may be present in the wood. This treatment is often required for the international shipping of lumber products. ITSPM certification stands for International Tropical Timber Organization – Program for the Endorsement of Forest Certification. The certification indicates that the lumber has been sourced from a responsibly managed forest. The certification process includes assessing the forest management practices, including environmental and social criteria. Together, these certifications indicate that the lumber has been responsibly sourced and treated to prevent the spread of pests and diseases, which assures customers that the product meets certain quality and sustainability standards.