Here's a good way to kill someone. My friend is on a job where plumbers cut his furnace vent to use for something else and left it exhausted in the basement. Internal furnace safety controls can't detect this so the last line of defense is a carbon monoxide detector

Forgot to mention that I have hardwood slabbing mill

Cold climate condensation thoughts! Roof sheathing condensation is often confused with bulk water. What distinguishes condensation from water intrusion? 1) it occurs in cold weather vs after rain, 2) roofing nail tips are the coldest point and thus the area around them is the worst