finally found an underlayment that lasts - what's your experience?

It’s wild how much heat loss can happen up there if the underlayment or air sealing isn’t up to par. Sometimes it really is just one overlooked spot causing all the headaches.

That hits home. I used to think it was all about the windows too, but after crawling around my attic and seeing the patchy old felt underlayment, it made sense why the upstairs was always freezing in winter and a sauna in July. Swapping out the underlayment (I went with a synthetic one this time) actually made a bigger difference than the new doors we put in last year.

Did you notice any noise changes after updating yours? I swear the house is quieter now, but maybe that’s just wishful thinking. Also, I’m curious - did you DIY the install or have someone do it? I tried tackling it myself, but the low-pitch roof made it a pain. Still, totally worth it for the comfort boost.

It’s kind of funny - sometimes the “big fix” is just fixing what’s been ignored for years.

Funny you mention noise - I thought I was imagining things, but after switching to synthetic underlayment, it legit feels like the rain isn’t as loud. Maybe it’s just my brain wanting to justify the hassle. I tried DIY too, but my roof’s pitch is basically a slip-n-slide. Never again.

Interesting - I've actually heard the opposite from a few folks, especially with metal roofs. Some say the synthetic stuff almost seems to amplify the sound, like it’s got a drum effect. I wonder if it depends on the type or maybe how tight everything’s installed? Honestly, I’ve crawled around on enough steep roofs to know DIY isn’t for the faint of heart... One slip and you’re regretting all your life choices. But yeah, noise is such a weird thing - sometimes it’s more about what’s underneath than the underlayment itself.

That drum effect you mentioned is real - I've noticed it on a few projects where the synthetic underlayment was stretched super tight under metal panels. Sometimes it almost feels like a snare drum up there in a heavy rain, but other times it's barely noticeable. I do wonder if it comes down to the roof deck material or even attic insulation more than just the underlayment type.

I’ve seen folks blame the underlayment for noise, but then you peek underneath and realize there’s just bare plywood with no insulation at all. That’ll echo every raindrop, no matter what’s on top. And yeah, installation makes a difference - loose spots can flap and make things worse.

Steep roofs are no joke, either. I’ve had my fair share of “what am I doing up here” moments... especially when the wind picks up. Props for tackling it yourself - takes guts and some good boots.

Curious if you’ve noticed any difference in noise with different brands, or is it all pretty much the same in your experience?

Steep roofs are no joke, either. I’ve had my fair share of “what am I doing up here” moments... especially when the wind picks up. Props for tackling it yourself - takes guts and some good boots.

Man, you nailed it with that one. I swear, every time I’m up on a 10/12 pitch and the breeze starts going sideways, I start questioning all my life choices. Good boots and a healthy respect for gravity are a must.

About the drum effect - yeah, I’ve heard it too. First time I noticed it, I thought someone was actually playing drums in the attic. Turns out, just a tight underlayment and a metal roof combo during a downpour. It’s wild how much difference the deck and insulation make. One house I worked on had thick spray foam under the deck, and you could barely hear the rain at all. Next job, same underlayment brand but just plywood and air... sounded like hail even when it was just sprinkling.

I’ve tried a couple brands (mostly whatever the boss grabs from the yard), and honestly, I can’t say I’ve noticed a huge difference in noise between them. Maybe some are a little thicker or have more grip, but if they’re stretched tight under metal, they all seem to get that snare drum vibe when it rains hard. The only time it was noticeably quieter was when we used a felt underlayment instead of synthetic, but that stuff’s a pain in the neck to work with on steep slopes.

You mentioned loose spots - totally agree. Had one section where we didn’t get it tight enough around a vent, and every gust of wind made it sound like a flag flapping. Drove me nuts until we fixed it.

Props for sticking with it and figuring out what works for your setup. Roofing’s one of those things where you learn something new (or weird) on every job. If you find an underlayment that actually kills the drum effect without being a nightmare to install, let us know... might save my sanity next rainy season.