How Long Does It Really Take To Insulate A House?

How Long Does It Really Take To Insulate A House?

That “never enough foam and caulk” feeling is way too real. I’ve lost count of how many times I thought a room was finally draft-free, only to find another icy breeze sneaking through some mystery gap. Old houses are like that - just when you think you know all their secrets, they throw you another curveball. I once found an entire wall cavity filled with old rags and what looked like bits of carpet padding. Creative, maybe, but not exactly up to code.

About those thermal cameras: I used to think they were just another gimmick, but after borrowing one from a contractor friend, I changed my mind. They’re not perfect - sometimes the readings can be misleading if you don’t know what you’re looking at - but they do make it a lot easier to spot the worst offenders. The cold spots behind my built-ins were way worse than I expected. It’s kind of eye-opening (and a little depressing) to see just how much heat is escaping through places you’d never suspect.

If you’re already knee-deep in foam and caulk, the camera’s probably worth trying before you go any further. Saves time and frustration compared to just guessing where the leaks are. But honestly, nothing replaces just getting your hands dirty and poking around in every nook and cranny. Sometimes the gadgets help, sometimes it’s just about crawling under the stairs with a flashlight and hoping for the best.

And yeah, newspaper insulation is wild but not that rare in older homes. Makes me wonder if people were just making do or if they really thought it would work long-term... Either way, it’s always a surprise what turns up behind those walls.

Old houses are like that - just when you think you know all their secrets, they throw you another curveball.

Totally get this. Have you ever tried blowing in cellulose or is it mostly foam and caulk for you? I’m curious if anyone’s had luck with those DIY kits, or if it just ends up being more hassle than it’s worth.

Blown-in cellulose is kind of a mixed bag, honestly. I’ve done it in two houses - one with a rental blower from the big box store, and another with a pro crew. The DIY kits work, but you need patience and a willingness to get messy. The stuff gets everywhere, and if you don’t seal every little gap first, you’ll just be feeding your attic or wall cavities for years. I learned the hard way that old lath and plaster walls love to swallow up insulation like a black hole.

Foam and caulk are great for the obvious leaks (outlets, rim joists, attic hatches), but they’re not going to do much for those big empty wall cavities. Cellulose is better for that, but it’s not magic - if your house is full of weird angles and hidden voids (which, let’s face it, most old houses are), you’ll probably miss spots unless you’re really thorough.

The rental blowers are loud and clunky, but they get the job done if you have a helper feeding bags. Just be ready for sore arms and dust in places you didn’t know existed. I’d say it’s worth it if you’re on a budget and don’t mind some sweat equity. If you want perfect coverage or have tricky walls, hiring pros might save your sanity.

One thing: don’t trust the “easy DIY” label on those kits. It’s doable, but it’s not exactly a walk in the park. I still find bits of cellulose in my hair months later...

I get where you’re coming from, but I’ve actually had better luck with blown-in cellulose than batt insulation, especially in weird old houses. The dust is a pain, sure, but at least you don’t have to wrestle with itchy fiberglass in tight spaces. I found the key was taking time to prep - taping off every possible gap and using a shop vac as I went. It took a weekend for a 1,200 sq ft house, but the energy bills dropped right away. Maybe not perfect, but way better than nothing.

Yeah, the dust with cellulose is no joke - I swear I was finding it in my socks for a week. But you’re right, trying to get batts into those weird crawl spaces or angled walls is just asking for frustration (and a rash). Did you run into any issues around electrical boxes or wiring? That’s always where I slow down since I’m paranoid about leaving gaps. Curious if you noticed any settling over time with the cellulose...