Several XPS questions...
Well, I went to HD and purchased the pink Owens 1-1/2" panels. Because my ceiling is low, I installed them horizontally...is this OK. And I got so fed up with out of square twisted 2x3's, I went ahead and go 2x4's and plan to lay them horizontally. But I cannot find long enough tapcon screws...the largest they have is 2-3/4", but my wall is now 3" thick (1-1/2" XPS and 1-1/2" layed flat 2x4). Do they make longer ones...but just not sold at most stores?
I must say, so far, I like the panels, they assembly nicely. I was using too much tubes of adhesive, so I purchased a gallon can, which is proving to be much better.
What kind of tape if any, should I seal the seams with, metal tape?