Foam boards are a game changer for sure, especially if you’re used to lugging around cement board or wrestling with green board. I’m with you on the price—it stings a bit at checkout, but after tearing out a tub surround that looked like a science experiment gone wrong (black mold everywhere), I’m not messing around with moisture anymore.
One thing I’m still not totally sold on is how foam boards hold up long-term behind tile. Anyone else ever worry about the compressibility? I know they’re rated for showers and all, but I’ve seen a couple of installs where the tile felt a little “soft” underfoot, especially on floors. Maybe it’s just me being paranoid, but I always double-check the specs and make sure I’m using the right thickness.
Cutting them is a dream, though. Last time I did a bathroom reno, I had the whole backer up before lunch—no clouds of dust, no sore arms. The only thing that tripped me up was sealing the seams. Some brands have their own tape and waterproofing goo, and if you miss a spot, water’s still gonna find a way in. I learned that the hard way with a leaky niche... nothing like discovering a puddle in your shampoo bottles.
I get why folks still go for green board in some cases—cheaper, and it feels more “solid” to some people. But after seeing what water can do, I’d rather pay a bit more upfront than deal with demo down the line. Still, I’m curious if anyone’s had issues with foam boards over time, or if it’s just my inner worrywart talking.
Cutting them is a dream, though. Last time I did a bathroom reno, I had the whole backer up before lunch—no clouds of dust, no sore arms.
Man, that’s exactly why I caved and tried foam board last time. My wallet cried a little, but my back was grateful. I get what you mean about the “soft” feel, though—I noticed it too on a shower floor once. Ended up doubling up the thickness and it felt way better. Still, sealing those seams is nerve-wracking... one missed spot and it’s game over for your shampoo stash. For me, the peace of mind is worth the extra bucks—mold is not making a comeback in my house if I can help it.
I hear you on the foam board “squish”—it’s like walking on a yoga mat in some showers. I’ll take that over mold any day, though. Honestly, green board gets hyped but I’ve seen it turn into a science experiment behind tiles if there’s even a tiny leak. I’d rather pay a bit more now than rip out a soggy mess later. Sealing those seams is a nail-biter, but it beats the alternative... trust me, I’ve seen enough horror stories to last a lifetime.
Green board’s one of those things that sounds good on paper, but I’ve pulled out enough mushy panels to know it’s not a magic bullet. Had a job last year where the homeowner swore by it—until we found black mold creeping up behind the tub surround. Turns out, one missed seam and you’re toast. Have you tried any of those newer waterproof backer boards? I’m seeing more folks go that route, even if it costs a bit more upfront.
Turns out, one missed seam and you’re toast.
Yeah, that’s been my experience too. Green board’s better than regular drywall, but it’s not really “waterproof”—just a bit more resistant. I’ve started using foam backer boards like Wedi or Kerdi in showers. Costs more, but honestly, I’d rather pay up front than deal with mold or demo later. One bad seam and green board just can’t keep up.
