The fence delineating the FPInnovations test site at Maple Ridge, BC was designed to be functional, but also to incorporate a study to determine whether a physical barrier between the soil and wood surface, in the form of a wrap, would affect the performance of ACQ-treated lodgepole pine roundwood in ground contact. After ten years in the field test, the fence posts treated with two formulations of ACQ, both wrapped below ground up to the groundline and non-wrapped, remained essentially sound. Early decay was noted on about 20% of the unwrapped posts but there was no significant difference between the two formulations, and no clear dose response.
A field test was installed to determine whether wrapping the below-ground portion of a post would allow a carbon-based preservative system, designed for above ground use, to be used in ground contact. After four years of exposure at two locations in Canada, the unwrapped untreated Pacific silver fir 4x4 posts showed significant decay, with all of the posts failed at one location. In contrast, the majority of the wrapped untreated posts remained sound at both test sites. Treated posts were in excellent condition with or without wraps.
A study was initiated to investigate the possibility of upgrading wood treated to residential standards for industrial purposes by the use of a barrier between the wood and the soil. Posts and lumber commercially treated with ACQ-D were installed at two test sites. Also included were wrapped posts treated with micronized copper with no co-biocide as a possible solution for organic farming and viticulture applications.