The use of borate-treated framing and sheathing has great potential as a method of making wood-framed buildings termite resistant in a manner more environmentally friendly than soil poisoning and whole-house fumigation. Forintek has already completed research on treatment of western Canadian wood species with borates, including white spruce, a species found in both western and eastern Canada. If the eastern Canadian forest products industry is also to take advantage of this value-added opportunity, processes need to be developed for treating other eastern species with borates. The objective of the research described in this report was to develop treatment processes which would allow eastern Canadian wood species to be treated with borates to British and North American standards. White pine, black spruce, jack pine and balsam fir boards were pressure treated with a borate solution using the full-cell pressure-treatment process common in the industry. End-matched samples were steamed in the retort prior to pressure treatment and half of the material was treated with a borate solution containing DDAC, a surfactant with fungicidal and termiticidal properties. The material was then stored wet to allow diffusion. Treatment efficacy was assessed by measurement of borate penetrate and retention. In the case of white pine and jack pine, green and dry lumber were equally permeable to borate treatment. However, black spruce and balsam fir were more treatable when green than when kiln dried. White pine met the American Wood Preservers' Association (AWPA) and British Wood Preserving and Dampproofing Association (BWPDA) standards immediately after pressure treatment. For jack pine and balsam fir, a storage time of between four and six weeks was needed to meet the these standards. Black spruce met the BWPDA standard after six weeks' diffusion but would require an increase in solution strength to meet the AWPA standard. The use of in-retort presteaming and DDAC additive did not provide any benefits in terms of improved penetration during pressure treatment or during storage of these species. Based on the information in this report, treaters should be able to develop borate treating schedules for white pine and eastern spruce-pine-fir appropriate for their own treating plants. Borate treatment can be carried out with conventional pressure treating facilities and should cost about the same as chromated copper arsenate (CCA) treatment.