Torch-down roofs: saw a news piece about fire risks - thoughts?

I get where you’re coming from with torch-down - fire risk is real, especially on older rowhouses packed close together. I’ve seen a few close calls myself, and honestly, I’ve flagged more than one job for charred fascia or scorched brick. The thing is, though, when torch-down is done right - good prep, dry substrate, experienced crew - it still outperforms most self-adhered systems in terms of longevity and water resistance. I’ve inspected torch-down roofs that are 20+ years old and still watertight, which is rare for peel-and-stick membranes.

That said, I do think the industry’s been moving away from open flame methods for a reason. Insurance companies hate them, and in some places you can’t even get coverage if you use torch-down. Plus, like you mentioned, patch jobs on any membrane roof rarely last as long as the original install - especially if corners were cut. I’ve seen people try to “quick fix” with cold-applied or peel-and-stick patches over torch-down and it just doesn’t bond well long term.

Green roofs are definitely appealing for temperature swings and stormwater management (and they look great), but you’re right - the upfront cost and structural requirements put most people off. Around here (Baltimore area), I see more folks going with TPO or EPDM lately. Single-ply membranes don’t have the same fire risk as torch-down but can be more prone to punctures if there’s foot traffic or debris.

No perfect solution - I guess it really comes down to risk tolerance and budget. If someone’s set on torch-down, I always recommend making sure the crew is certified and that there’s a fire watch during install...but honestly, for most homeowners these days, self-adhered or single-ply might be the safer bet unless they really need that extra durability.

Torch-down definitely has a reputation for lasting, and I’ve seen it hold up through some gnarly storms. My neighbor’s place had a torch-down roof put on in the late ‘90s, and it’s still going strong - no leaks, no bubbling, just the occasional patch where a branch scraped it. But I’ll admit, when they did a repair a few years back, I was sweating bullets watching those guys with the torches so close to our old wood siding. One stray ember and half the block could’ve gone up.

I get why folks are nervous about fire risk, especially in these older neighborhoods where everything’s packed tight. Insurance is a headache too. When we redid our own flat roof last year, the adjuster basically said “no way” to torch-down unless we wanted to pay through the nose. Ended up going with TPO instead. It’s not as bulletproof as torch-down, but at least I can sleep at night without worrying someone’s going to burn the house down during install.

I will say, though, I kind of miss how solid torch-down feels underfoot compared to single-ply. TPO’s fine, but it just seems more vulnerable to dropped tools or the occasional squirrel trying to dig for treasure. We’ve had to patch it once already after a windstorm tossed some branches up there.

Green roofs look amazing, but yeah, the price tag is wild. We looked into it - between beefing up the joists and all the layers, it was double what we budgeted. Maybe someday if we win the lottery.

If I had to do it again, I’d probably still skip torch-down just for peace of mind, but I totally get why some folks swear by it. Like you said, no perfect answer - just have to pick your battles and hope for mild weather.

Yeah, I hear you on the insurance headache. We priced out torch-down too and the fire risk just made it a non-starter for us, especially with how close our neighbors are. TPO isn’t perfect, but at least I’m not stressing every time someone’s up there with a heat gun. I do miss that solid feel underfoot, though - TPO feels a bit flimsy, especially after a few storms. Still, peace of mind counts for a lot.

Yeah, I get what you mean about TPO feeling kinda thin compared to torch-down. After a big windstorm last fall, I noticed a couple seams starting to lift on my uncle’s TPO roof. Anyone had better luck with modified bitumen or is it just as risky fire-wise?

- Modified bitumen’s definitely heavier-duty than TPO, but yeah, torch-down can be risky if you’re not careful with the flame.
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“is it just as risky fire-wise?”

- I’d say it depends on install method. Cold-applied or self-adhered mod bit is way safer than torching.
- Had a neighbor go with self-adhered last year - no torch, no drama, and it’s held up fine through two storms.
- Curious if anyone’s tried the peel-and-stick mod bit on a low-slope? Wondering how it compares for leaks vs. torch-down.