How Long Does It Really Take To Insulate A House?

Not glamorous at all - my knees hated me for days - but my heating bill dropped noticeably after that.

Totally get you on the crawlspace pain. People always talk up attic insulation, but honestly, sealing and insulating basements and crawlspaces can be a game changer. I’d say if you skip those, you’re missing a huge piece of the puzzle. My approach: attic first (quick win), then crawl/basement (messy but worth it), then walls if you’re really committed. It’s not just about comfort - it’s about where the leaks actually are, and they’re sneaky.

Couldn’t agree more about the crawlspace and basement - those areas are often overlooked, but they’re usually where you get the most bang for your buck in terms of energy savings. I’ve had a few properties where we did the attic first, saw a small improvement, but it wasn’t until we tackled the basement and crawl that the utility bills really dropped. It’s not glamorous work, and yeah, it’s rough on the knees (and sometimes your back), but the payoff is real.

One thing I’d add: air sealing is just as important as insulation itself. I’ve seen people throw a ton of insulation into attics or walls, but if you’ve got gaps around rim joists or sill plates, you’re still losing heat. Sometimes it’s the little details - like spray foaming those weird corners or sealing up old vent holes - that make the biggest difference.

If you’re looking at timelines, attic jobs can be done in a weekend, but crawlspaces and basements can drag out, especially if you run into moisture issues or have to move a bunch of old junk. Still, worth every bit of hassle in the long run.

Funny you mention air sealing - I learned that lesson the hard way on a duplex I picked up last year. We blew in a bunch of cellulose in the attic and thought we were golden, but the heating bills barely budged. Turned out there were gaps all along the rim joists in the basement, just leaking air like crazy. Curious if you’ve ever tried those DIY spray foam kits? I’m always torn between hiring it out or tackling it myself, especially when timelines start dragging. Also, have you run into issues with old wiring or plumbing slowing things down in basements? That’s been my biggest headache.

Curious if you’ve ever tried those DIY spray foam kits? I’m always torn between hiring it out or tackling it myself, especially when timelines start dragging.

Those DIY spray foam kits are kind of a double-edged sword. They’re awesome for small jobs - like rim joists, totally agree that’s where all the heat escapes - but the mess and fumes are no joke. If you go that route, tape off everything and wear the full gear. I’ve had to rip out old knob-and-tube wiring in basements before I could even start, which is a whole other can of worms. Honestly, I’d rather spend an extra weekend getting it right myself than pay someone who’ll just rush through it and miss spots. But yeah, old plumbing and wiring are always lurking down there, waiting to wreck your schedule.

Honestly, I’m with you on the DIY kits being a mixed bag. They’re tempting for quick fixes, but I’ve seen way too many jobs where people underestimated just how much prep and cleanup is involved. The fumes are brutal, and if you don’t get the temperature and humidity just right, the foam can cure weird or not adhere properly. I’ve had clients call me in after a botched attempt, and it’s never fun scraping off half-cured foam from joists.

One thing I’d add - if you’re dealing with older homes, you really have to be careful about sealing up areas that might need future access. I’ve seen people spray right over shutoff valves or junction boxes, which is a nightmare down the line. Sometimes, paying a pro isn’t just about speed, it’s about knowing what *not* to cover up. But yeah, if you’re meticulous and don’t mind suiting up, there’s a certain satisfaction in doing it yourself... just don’t underestimate the hassle.