Title: Need advice on replacing an old leaky roof
You’re spot on about the underlayment and flashing—those details make or break a roof, no matter how fancy the shingles are. I’ve used synthetic underlayments on a few projects now, and honestly, I haven’t seen any issues crop up yet. They’re definitely easier to handle than felt, especially if you’re working alone or in weird weather. Grace Ice & Water is still my go-to for vulnerable spots, but the synthetics seem to hold up well as long as you don’t cheap out too much. You did it right focusing on those layers first.
Title: Need advice on replacing an old leaky roof
I’ve got to admit, I was skeptical about synthetic underlayment at first. Grew up watching my dad use felt on every job, and he swore by it—said it was the only thing that stood up to our crazy spring storms. But after wrestling with those heavy rolls in the wind (and nearly sliding off the roof more than once), I finally caved and tried synthetic last summer. Night and day difference. Way lighter, didn’t tear up when I dragged it around, and it actually stayed put when the wind picked up.
That said, I’m still not totally convinced it’s as tough as felt over the long haul. Maybe I’m just old school, but I keep wondering if we’ll see issues pop up in ten or fifteen years that nobody’s talking about yet. Still, for ease of install and dealing with unpredictable weather, synthetics have made my life a lot easier. And yeah, Grace Ice & Water is non-negotiable for valleys and eaves—learned that the hard way after a nasty ice dam a few winters back. Sometimes you just can’t cut corners, no matter how tempting it is to save a few bucks.
Title: Need advice on replacing an old leaky roof
I hear you on the felt vs. synthetic debate. I was in the same boat for a long time—felt just seemed like the tried-and-true option, and I’d seen it hold up through some pretty rough seasons. But after a couple of projects where we had to haul those heavy rolls up three stories in the middle of a windstorm, I started rethinking things. The last big job I did, we switched to synthetic mostly because the crew was tired of fighting with felt in bad weather. Honestly, it made the install way less stressful.
That said, I still have mixed feelings about how these synthetics will age. Manufacturers love to talk up the UV resistance and tear strength, but there’s not a ton of real-world data past maybe 15 years. Felt’s got that track record—if it’s installed right, you know what you’re getting. Synthetics are still kind of a gamble long-term, at least in my mind.
One thing I’ve noticed is that some synthetics get slick when they’re wet, which can be a pain if you’re up there during a surprise shower. Not a dealbreaker, but something to watch out for. And yeah, Grace Ice & Water Shield is a must for me too, especially on older homes with weird rooflines or shallow pitches. I’ve seen too many “budget” jobs come back to haunt people after a rough winter.
At the end of the day, I think it comes down to what you’re comfortable with and what kind of weather you’re dealing with. If you’re in an area with wild temperature swings or heavy storms, I’d still lean toward overbuilding those critical spots—valleys, eaves, anywhere water likes to sneak in. Cutting corners there just isn’t worth it... learned that lesson more than once.
Funny how much roofing comes down to balancing old habits with new tech. Sometimes you just have to pick your battles and hope you don’t end up patching leaks in February.
Title: Need advice on replacing an old leaky roof
I get where you’re coming from about the reliability of felt, but I’d actually push back a bit on the idea that synthetics are a gamble long-term. There’s definitely less data compared to felt, but some of the higher-end synthetic underlayments have been through accelerated aging tests and have held up surprisingly well. I’ve seen a few case studies—granted, mostly from Europe—where synthetics have been in service for 20+ years without major issues. Not saying that’s universal, but it’s not quite the wild west some folks make it out to be.
From a green building perspective, I’d argue that synthetics can actually be the more sustainable choice, depending on the product. Some of them are made with recycled content and are lighter to transport, which cuts down on emissions. Plus, if you’re dealing with a roof that’s tricky to ventilate or insulate, synthetics can help manage moisture better than felt, which is pretty important for energy efficiency and indoor air quality. Felt can trap moisture if things go sideways, and that’s a recipe for mold or rot—seen it happen more than once in older homes.
The slip factor is real, though. I’ve had a few tense moments up there when things got slick. But honestly, I’d rather deal with that than have to rip up a bunch of swollen, soggy felt after a storm delay. And as for Grace Ice & Water Shield, totally agree—it’s non-negotiable in my book, especially with climate getting weirder every year.
If you’re really worried about longevity, maybe look into hybrid systems—synthetic underlayment with a self-adhered membrane in the valleys and eaves. It’s a bit more upfront, but you’re hedging your bets on both performance and durability. Sometimes it’s worth paying a little more now to avoid headaches (and landfill trips) later.
Old habits die hard, but sometimes the new stuff really does solve problems the old stuff just couldn’t.
I hear you on the slip-and-slide factor with synthetics—those things can be like walking on a banana peel if there’s even a hint of dew. Still, I keep coming back to the moisture management piece. I’ve seen too many old roofs where felt just became a petri dish for mold after a minor leak went unnoticed. That’s not just bad for the house, it’s rough on anyone with allergies or asthma.
The hybrid approach makes a ton of sense, especially if you’re in an area where freeze-thaw cycles are a thing. It’s not the cheapest route, but neither is dealing with rot repairs down the road... ask me how I know. Plus, some of the newer synthetics are actually recyclable at end-of-life, which feels like a win compared to tossing soggy felt in the landfill.
It’s funny—ten years ago, I’d have sworn by felt without thinking twice. Now? I’m all about finding something that’ll outlast me and keep the attic dry, even if it means learning to ice skate up there once in a while.