Had to laugh at the “full-body workout” part—been there, done that, and my back still remembers. I went with self-adhered once because I thought it’d be a one-and-done deal, but life had other plans (hailstorm two years later). Peeling it up was brutal and honestly made me question if the leak was worth fixing myself. Since then, I’ve stuck with synthetic. Yeah, the bubbles are annoying, but for the price and how much easier it is to patch or replace, I’ll take it. For folks on a budget or who might need to do repairs down the road, synthetic just makes more sense to me.
Peeling it up was brutal and honestly made me question if the leak was worth fixing myself.
Man, I hear you. First time I tried pulling up self-adhered after a Texas summer, I thought the roof was gonna come with it. Synthetic’s been way easier for patch jobs, but yeah, those bubbles drive me nuts sometimes. Still beats wrestling sticky underlayment in 90-degree heat.
Synthetic’s been way easier for patch jobs, but yeah, those bubbles drive me nuts sometimes.
Same here—the bubbles really bug me, but I’ll still take that over the sticky mess of self-adhered, especially when it’s hot out. I tried going back to felt once because it was cheaper, but it tore way too easily and didn’t hold up during a storm. For me, synthetic’s worth the extra few bucks just for peace of mind and less hassle if you need to peel it up again. Just wish there was a perfect option that didn’t come with its own set of headaches...
Had the same thought process when I bought my place last year—felt seemed like the obvious choice since it’s everywhere and cheaper, but after one storm and a couple ripped spots, I regretted it. Ended up patching with synthetic and yeah, those bubbles are annoying, but at least I’m not dealing with water sneaking in or the underlayment sticking to itself and turning into a mess.
One thing I keep wondering about is how these synthetics hold up over time, especially with the temperature swings we get here (Midwest, so hot summers and freezing winters). Anyone notice if the bubbling gets worse as it ages, or does it kind of settle down after a while? I’m also curious if anyone’s tried those “breathable” synthetics—are they actually worth the extra money, or just marketing hype? I’ve got a low-slope roof, so moisture buildup has me a little paranoid.
I’ve been down the same road with synthetics on my own place (also Midwest, and yeah, the weather swings are brutal). The bubbling thing drove me nuts at first—looked like my roof was trying to breathe. In my case, the bubbles didn’t really get worse after the first year. They kind of flattened out once the material settled and the shingles went on, but I still see a few spots where it’s not perfectly tight. Doesn’t seem to have affected performance, though. No leaks so far, and we had a couple nasty freeze-thaw cycles this winter.
About those “breathable” synthetics: I tried one on a shed project last fall, mostly out of curiosity. It was pricier, and honestly, I’m not convinced it made a huge difference for my setup. Maybe if you’ve got a really low slope or poor attic ventilation, it’d help with trapped moisture, but for most jobs I think it’s more marketing than miracle. The regular synthetics already do a decent job of keeping water out without turning into a sponge underneath.
One thing I’d watch for is how the synthetic handles UV if you’re leaving it exposed for a while. Some brands break down fast in direct sun, and that’s when you start seeing real issues—tearing, brittleness, etc. If you’re doing a slow DIY job or waiting on shingles, that’s something to keep in mind.
I get the paranoia about moisture on low-slope roofs. I ended up adding an extra layer of ice & water shield at the eaves and valleys just for peace of mind. Not cheap, but less stress when the snow starts melting in March.
If you’re patching or adding new underlayment, make sure the overlaps are solid and you’re not trapping water between layers. That’s where I’ve seen problems crop up—especially if you get a surprise rain mid-project.
All in all, synthetics have held up better than felt for me, but I wouldn’t pay double for “breathable” unless you’ve got a specific moisture problem you’re trying to solve. Just my two cents from a few years of trial and error...
