Just finished replacing a compost bin for friends who garden mightily in the city. My clients were tired of tree roots growing up thru the bottom of the old bin, so we made this one sit atop stone and fabric with a bottom of composite decking. Since they wanted this to last and didn't have the budget for cedar, they went with pressure-treated. HD here now sells Weathershield, a micronized copper quaternary, that is said to be safer than past lumber treatments like CCA and ACQ. The lids…
