Trim Between Lap Siding and Cedar Shakes
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I’m adding siding to a small building (6’x14′) that is sheathed with 7/16″ OSB, has 1″ of polyiso foam over that, then Tyvek and finally SmartSide lap siding. On the two 6′ ends there is a very small gable that is only about 17″ in height. On the gable I want to install cedar shakes which I will be sealing with sealonce (polyurethane). On a lot of gables in my area with shakes, I typically see an 8″ trim board with a z-flashing on the top between the lap siding and the shakes. In my case I have not a lot of room so I wanted to skip the trim and z-flashing. My plan was to simply run 30# felt on top of the Tyvek, a couple inches over the top course of lap siding and run the cedar shakes lapping directly over the lap siding.
My question is: Does the 8″ trim board between lap and gable shakes serve any purpose other than cosmetic?
Replies
I would not rely on a tyvek overlap.
What about using the z flashing to lip over the top of your siding.
Run your felt down to the kick out.
Starter coarse of shingle down to the kick out , then the first coarse drops over and covers the little bit of metal of the kick out.
You might have to putz with the thicknesses a bit (on the starter coarse )so that 1st coarse isn’t short of or sticking beyond the z. The rest of the above courses should all look the same.