The camera is a cruel critic! These smoke jacks look pretty good in real life, but when you get them under a macro lens, the deficiencies sure leap out. To be fair to myself, I think the camera was tilted in the photo above, and the two smoke jacks are actually quite vertical.
To get them vertical and the right height, I cunningly created a block of wood that is 16’6″ tall and sat the smoke jacks on it while the glue set. I’m happy to say that this worked like a charm. I’d had visions of an extended cuss-fest as each smoke jack held its position for a couple of minutes before sagging to whatever elevation it wanted to assume, while spreading glue up and down the visible sides.
Neil Erickson asked the other day why I didn’t make the holes for the smoke jacks when cutting out the roof. I actually cut H-shaped slices roughly where the smoke jacks needed to go. I then popped the jacks up through the centre of the H, and trimmed the roof back to fit. This enabled me to delay the precise location of the hole until I knew how it had to work with the smoke jack.