Got the concrete board wall up and dumped a punch of perlite around the oven. The problem with changing the plans multiple times is that it eventually messes stuff up. I had figured three 4’x8’ sheets of plywood for the roof (a 4 foot, a piece cut to 3 feet, and another cut to a little over 2 feet depending on the length of the front overhang which I couldn't decide on) and that adds up. What I messed up was having the roof framing line up at the right spot. Lots of measuring, a little bit of cursing and some work with a circular saw and each of the 3 sheets of ply wood were cut to something’ x 8’ so they hit the framing. There’s a reason everything is supposed to be 16 inches on center. Local framing contractors do not need to worry about me stealing their business.
Once two pieces of plywood were on, I quickly realized my plan for locating where to cut the hole for the chimney wasn’t going to work. I had thought I’d be on the one piece of plywood and reach under to locate “centerish” with some help from the bottom. However, instead of being on one piece of plywood, two pieces had to be put up to get past the chimney location. Not sure this makes any sense. I had planned to be working fairly close to the edge of a 4 foot piece of plywood. I could lay on top and reach under. But I needed 2 cut pieces of plywood (about 6 feet up there), so I couldn’t reach around the framing to touch the center of the chimney. Plan B was needed.
We best guessed near center and drilled a hole. As long as the holes were inside the circle that was getting cut out, it didn’t matter how many were drilled. I lowered a string with a screw tied to the end (homemade plumb bob). From that location, we re-estimated center-ish (a few inches towards the front and a just a little bit more to one side. Drilled another hole and tried again – pretty close. I drilled a screw in where I thought center was. Using a string and a Sharpie I marked out a 12 inch circle. Then starting from one of the holes, I cut out the circle with a jig saw. Up came the chimney pipe (a 5 foot length of 8 inch double walled Duravent – outside diameter is 10 inches). Holy $h!t, it fit.
then we got the rest of the plywood on the roof. Snow and ice barrier is usually over the last 3 or 6 feet of a roof line. Since the whole roof is 9’ by 8’ and the barrier is sold in 150 square foot package, we covered the whole thing. After that, I popped the chimney flashing and cap on to the pipe. Structurally, the oven is done. Topping party!
I don’t really know the ins and outs of small building construction. My goal, based solely on earlier indecision, was to leave a 1.5-inch overhang with the plywood around the entire frame. 20/20 hindsight being what it is, I should have shot for ¾ of an inch. To fill this gap I needed a 2xsomething piece of wood which are significantly heavier than 1xsomething. Doesn’t mater structurally, more for installation difficulty.
So I got a bunch of 2x8s (which are actually 1.5”x7.25”), ripped about half an inch off them (the metal roof framing is 6 inches deep and the extra ¾ inch if to make a line with soffit (bottom of the eave). Once they were ripped I used the router and ½ in round over bit to make the bottom edge pretty. Then came the installation. Each fascia board was clamped into position. Pilot holes were drilled and the widened a little for a counter sink. Each board was then attached with a bunch of screws. I’ll either plug the holes with a little piece of word or maybe a rounded button. I’ve got to decide which looks better.
It was now about 7:00 on Sunday. I didn’t think putting up the drip edge was going to be a problem. But it was. And I messed it up. Expletives were muttered. OK, maybe louder than a mutter. I got the back piece on and called it day. After some more research and looking at our roof, it appears that no one does drip edge the way I was trying. And I think bending one piece around a corner was harder with the drip edge I was using. I got the kind that has a 6 in flap so I could get past the steel framing to nail it on. It might work better with the 2-inch kind that could have worked if I built the entire roof out of wood. Caulk will be my friend here.
Got the rest of the drip edge on and then set up to do the shingles. My wife was cutting them and I was crawling around the roof nailing them on. We were careful to avoid nails going into the steel framing. We got lucky, there was really only one row that was a little too close for comfort. Cut out around the chimney pipe, got the flashing down and then kept going towards the top. (Side note: you can’t get more of an open ventilated area than the top of a roof and I think I caught a buzz off of the caulk around the flashing.) We finished up around 7:30.
There are a few things I want to touch up on the roof but the roof is basically done. I also used a mesh tape and some thin set mortar over the concrete board joints (thanks for the tip Tom). Here's the view from an upstairs bedroom.
I've started getting some of the soffit stuff together. Hope to work on that in the near future.