If I had to start over, I’d probably still lean mineral wool, but man, I’d budget way more time for the details. Last year, I spent hours fussing with those window corners—felt like a jigsaw puzzle. But when you get it right, the payoff’s worth it. Foam’s tempting for speed, but I’ve seen too many horror stories after a leak.
I get the mineral wool appeal, but honestly, I went with EPS foam panels last time and haven’t had regrets—yet, anyway. I hear you on the leak stories, but I think a lot of that comes down to sloppy taping or missing flashing details. If you’re careful with the seams and don’t cheap out on tape, it’s not as risky as people make it sound. Plus, the cost difference was huge for me... every dollar counted. Still, those window corners are always a pain no matter what you use.
EPS foam definitely has its place, especially when budget is a real constraint. I get the skepticism around leaks—honestly, I’ve seen both horror stories and total success with foam panels. You’re right, a lot of the issues come down to attention to detail. If you’re meticulous with taping and flashing, the risk drops a lot. Still, I do think there’s a bit of a learning curve. Not everyone realizes how unforgiving foam can be if you miss a seam or skimp on tape.
Window corners, though... yeah, those are always tricky. I’ve tried a few different products and techniques over the years, and I’m not convinced there’s a perfect solution out there. Sometimes it feels like you’re just choosing which headache you want to deal with. But if your install’s holding up and you kept costs down, that’s a win in my book. Just keep an eye on those details over time—sometimes issues sneak up a few years down the line.
If I had to start over, I'd probably skip EPS foam for the base structure unless the budget was *really* tight. Here’s why:
- The margin for error with foam is just too small. Miss a seam, and you’re inviting moisture issues down the line.
- Taping and flashing can be done right, but it takes a level of patience most folks (including me on a bad day) don’t always have.
- Window corners are notorious—no matter how careful I’ve been, there’s always some tiny spot that makes me nervous. Tried liquid flashing, preformed corners, even origami-style tape jobs... none are truly foolproof.
If you’re stuck with foam, I’d double down on redundant layers at those tricky spots. Two tapes, or tape plus liquid flashing—overkill maybe, but it’s better than tearing out moldy sheathing in five years.
Honestly, if I could swing the cost, I’d lean towards mineral wool or something more forgiving next time. It’s just less stressful knowing the material itself isn’t going to trap water if you miss something minor.
But yeah, if your install’s holding up so far, that’s a good sign. Just keep an eye out for those subtle changes—sometimes it’s the little stuff like a faint musty smell or paint blistering that gives you an early warning.
I hear you on the foam headaches. We used EPS for our slab edge, mostly because the numbers just didn’t work for mineral wool at the time. I’m still a little paranoid about moisture sneaking in somewhere, especially around the back door. I do check for that faint musty smell every spring... so far, so good, but it’s always in the back of my mind. If I had to do it again, I’d probably pony up for something more forgiving too.