When it comes to installing windows and trimming them out with a rainscreen system, you have a couple of options. One way is to install the window 3/4 in. out by placing it over some plywood bucks, which makes for a trim install with no extension jams. But in this demonstration we’re going to install the window flush with the sheathing plane and add extension jams.
Whenever possible I like to batch cut and pre-assemble