How Long Does It Really Take To Insulate A House?

- Did blown-in cellulose in my 1915 bungalow last fall - took way longer than I thought.
- Prep was half the battle: moving boxes, sealing gaps, taping vents...
- Actual blowing? Maybe 6 hours for 900 sq ft, but cleanup dragged on for days.
- Dust got everywhere, even with tarps. Old houses just seem to suck it in.
- Worth it for the comfort, but man, I underestimated the mess.

Yeah, the dust is no joke - my 1920s place practically coughed up clouds for a week after I did mine. I hear you on the prep, too. I actually spent more time sealing up weird little gaps than on the insulation itself. Honestly, I thought cellulose would be less messy than fiberglass, but it still found its way into every nook. Still, the difference in winter drafts was huge... just wish I’d invested in better goggles.

Totally get what you mean about the dust - cellulose is sneaky. I’ve done a couple houses and every time, it’s like the stuff multiplies behind your back. But yeah, sealing up gaps is half the battle. At least you noticed a real drop in drafts...makes all the hassle worth it, right? Next time, goggles are non-negotiable.

“cellulose is sneaky. I’ve done a couple houses and every time, it’s like the stuff multiplies behind your back.”

Tell me about it. The first time I used cellulose, I thought I’d prepped enough - nope, that stuff finds its way everywhere. Sealing gaps is key, but honestly, people underestimate how much time cleanup eats up too. Drafts drop, sure, but you lose a day just tracking down stray dust. And yeah, goggles... learned that one the hard way. If you’re not sweating by the end, you probably missed a spot.

“you lose a day just tracking down stray dust. And yeah, goggles... learned that one the hard way.”

That’s the part nobody warns you about - cellulose dust gets *everywhere*. I remember the first time I tried blowing it into an attic, I thought taping up the hatch and laying down some sheets would be enough. Wrong. Couple hours in, looked like I’d crawled through a flour mill. Even found dust in my coffee mug the next morning.

Cleanup always takes longer than I think, but honestly, prep eats up a ton of time too. Taping off electrical boxes, sealing top plates, all those little gaps. I’ve had jobs where insulating took half the day, and the prep and cleanup each took a quarter. If you skip any of that, you’ll pay for it - either in drafts or hours spent vacuuming every nook and cranny.

Funny thing is, I used to think fiberglass batts were worse for mess. At least with those, you can see what you’re dealing with and (usually) keep things contained. Cellulose just floats on air currents and seems to multiply when you turn your back.

One trick I picked up - run a box fan out a window nearby. Helps keep the worst of the dust from settling in the house, though you’ll still be finding little tufts weeks later. And yeah, goggles are non-negotiable. Learned that after a solid hour of rubbing my eyes and regretting every life choice.

It’s worth it for the comfort boost, but “how long does it really take?” depends on how much you want to clean afterward. If it’s someone else’s house, double whatever time estimate you have in your head. If it’s your own place...well, you get to live with the dust for a while.