Window cut-outs and taping sheathing

We put the Zips System tape over the joints in the sheathing, starting with the roof, which we got done before the rain a couple days later.



Here I am taping some steel strapping that i have going through the roof. I'll fold them over a "curb" on the edge of the green roof, and nail them down. They connect to studs that are strapped to the trailer frame. (or are the end of a long strap that connects to the trailer frame). It took me until the last one to figure out the best way to get the tape around the straps. The key is to make a "gusset" in the same plane as the strap, so that you don't ever have a corner where water can just go through one butt splice, and get in.






We have been cutting out the windows, and we finally got them all done.
The easiest way I found to cut out the windows (without a roto-zip) was to drill a bunch of holes from the inside, around the edge of the window. Then, connect the dots with a chalk-line or straight edge. Then I cut it with the battery-powered saw. Note that in the picture below, I am overreaching, and we shouldn't do that, because it is dangerous:


This window was over a joint in the sheathing, so it came out in two sections:


The kitchen/loft window is cut:



Test fitting the half-moon window. I traced the window on a scrap of sheathing, and cut that template out. Then I tacked that to the inside of the sheathing where I wanted the window (centered in the framed box). I traced that, and then drilled a hole every inch or so. Then from the outside, I connected the dots with a reciprocating saw. The window fit!
I had to be pretty accurate at each step, because I was transferring the shape about 5 times.