- Thermal bridging was a headache for me, especially around the rafters. Even with spray foam, I still got cold spots.
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Same here—ended up using rigid foam over the whole assembly, then sealing every seam. Not cheap, but it helped.“Did you run into issues with thermal bridging at all? That was a pain to solve in my setup.”
- ERV’s a good call. I tried just trickle vents at first, but it didn’t cut it... air felt stale.
- Turning these spaces into bedrooms is doable, but honestly, dialing in insulation and airflow takes more time (and money) than most folks expect. If you skip steps, you’ll pay for it later.
Worth it? Depends how much you value comfort and energy bills. I had to double up on rigid foam outside the rafters, tape every seam, then add an ERV—tried skipping the ERV, but it just felt stuffy. Not cheap, but skipping steps made things worse. If you’re not ready for the hassle, maybe rethink it... but if you do it right, it’s a solid upgrade.
I hear you on the ERV—ventilation is one of those things people skip and regret later. I’ve done a few attic conversions, and honestly, the comfort difference when you go all-in on insulation and air sealing is night and day. My process usually goes: 1) plan for more insulation than code, 2) seal every gap (spray foam in tricky spots), 3) mechanical ventilation, and 4) check for weird thermal bridges. It’s a pain upfront, but resale value jumps if you can show it’s done right. Cutting corners just leads to callbacks and complaints... learned that the hard way.
I’ve run into the same thing—people think slapping up some drywall and calling it a bedroom is enough, but man, you feel every shortcut once summer hits. I did a garage conversion last year and underestimated the air sealing around the old garage door framing. Ended up with drafts I could never quite chase down. Do you ever find it’s worth using rigid foam over spray in those weird spots, or is it just more hassle? I always wonder if buyers even notice the difference, but the callbacks sure make me notice...
Rigid foam has actually saved my bacon a couple times, especially in those weird, awkward gaps where spray just doesn’t seem to cover right. I get what you mean about hassle, though—cutting and wedging those pieces in around old framing is a pain, and you end up with a pile of little scraps everywhere. But honestly, in these old houses, I’ve found it’s the only way to really block out those sneaky drafts. Spray foam just shrinks or pulls away over time, at least in my experience.
Buyers might not notice right away, but once they live through a summer or winter, they’ll know. I had a guy call me up after a year in his “brand new” attic bedroom, asking why his socks froze to the floorboards. That’s when you realize shortcuts come back to haunt you. If you’re already in there, I’d say take the extra time with the rigid foam. It’s not glamorous, but neither is crawling back in six months later with a caulking gun and regrets.