Proper order of sheathing, flangeless windows, WRB, and rainscreen?
I am set to sheath my house after getting all of the double studs finished. I know there have been hundreds of articles on how to flash windows and it seems JLC and Fine Homebuilding magazines feature a “new and improved” method every month, but I was hoping to get some feedback on my particular situation.
Here’s a quick run down of what I have going. I am using 7/16″ plywood for sheathing, 30# felt for WRB, 1×3 purlins run horizontally for rain screen, and LP smartside lap siding turned vertically to do board and batten (as an aside: doing this may void the warranty). My windows are Intus windows with no flanges.
In the October 2015 edition of JLC, there is an article on Installing High-Performance Windows. The author flashes the rough opening and then window directly to the ZIP sheathing and as a precaution, will later add a layer of felt paper. I think I can adapt this method for my situation with the only difference being I have plywood and not ZIP sheathing, which will change the order of the felt paper being applied.
Making things a little bit tricky is I plan to frame out the window openings with the same 1x3s I am using for my rain screen so that my window can be in the same plane as my siding, thus avoiding the need for trimming with sheet metal afterwards.
Do you all think this ordering of steps is good?
1. Plywood sheathing
2. 30# felt
3. 1×3 frame around window opening
4. Flash rough opening with SIGA tape and wrap it over 1×3 frame
5. Install window >
6. Flash flangeless window frame and wrap tape onto 1×3 frame
7. Cover any exposed part of 1×3 frame with additional flashing tape.
An alternative method would see me doing everything I just said except applying the 30# felt after all the windows had been installed and flashed.
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