This year I started trying to maintain a steady 50% relative humidity in the shop.

The dry shop air during the winter months shrinks the wood on the old canoes, which opens up the planking gaps. Building with very dry wood just means that the planking wood will swell when it picks up moisture later on. Both situations are problematic. Working with a steady 50% RH helps.

The only problem is that some of my windows were never intended to deal with this sort of situation, they are still only single pane glass, something that I need to remedy. This does create some fascinating frost patterns on really cold days.

Here is one.