The pictures show only part of the damage. Here's the story: the canoe is a very old Bastien Bros "Huron" 16. I've had it for over 20 years. I re-canvased it in the spring of 2018, replaced outer gunwhales, replaced the centre thwart with one better fitted for carrying. At that time, I was living in Labrador and though there is a lot of precipitation, most of it is snow and humidity is very very low through the winter. When I put the canvas on the canoe, it had dried to the point that there were gaps in the planking of nearly 1/4". A lot of the planking is spruce or pine I installed 20-something years ago after damaging the original cedar tearing fiberglass off it. It's all 4" plank. Then we moved to Nova Scotia. The canoe spent the winter on a pair of sawhorses, well covered with a tarp and I did not even look at it until a month ago. The canvas was torn at both ends and pulled out from under the gunwhale in a couple of locations. The pipe lagging filler had cracked and crazed almost everywhere from the stretching. The only possibility that I can see for the source of the damage is from the canoe woodwork absorbing water from the air and expanding. When I pulled the tarp off and turned the boat over, it weighed 20 to 30 pounds more than it did last fall and the planking was all tight to the point that seams were bulging very slightly under the canvas. So I believe the plank expanded to the point that it ripped the canvas.