Hello – please help! I am a mostly hand-tool woodworker with modest resources – these include working in a thin-walled garden shed with a propane heater going when I’m in there in the Seattle winter. In general, I work on projects from wood that is stored year-round in the shed, finish them usually with polyurethane, and then move the completed furniture into our (centrally-heated) house for use. I have noticed that joints which were planed/sanded flush, and finished to a smooth surface appear to shrink across the grain after a few weeks inside to the point that the surface of the joint is no longer flush, and a ‘step’ can easily be felt between individual components. I assume this must mean some partial fracture of the glue line, and compromise of the joint. In one case a lap joint that was precisely cut, clamped and glued, and finished with polyurethane, began to frankly split. I assume all this has to do with moving wood from a relatively wet environment (my shed) to a dry one (our house), with consequent drying out of the wood, despite finishing all surfaces with relatively impermeable polyurethane. How do I deal with this depressing problem without building a climate-controlled workshop?? Should I keep my wood in the house and only work it in the shed? Would a dehumidifier help? There must be plenty of others in my situation working in a shed or garage without heat. Thanks so much