Getting attic airflow right: my step-by-step for better roof health

Those inspection cameras are actually pretty handy, especially if you’re dealing with weird attic angles. I picked up a cheap one a couple years back - nothing fancy, just plugs into my phone - and it’s saved me from crawling into tight corners more than once. Not perfect resolution, but enough to spot gaps or see if insulation’s blocking vents. For the price, I’d say it was worth it just for peace of mind.

About those pre-formed blocks: I’ve used them in a few attics where access was tough. They’re definitely easier to fit than wrestling with leftover batts, but yeah, they cost more. The main thing is they don’t sag or shift over time like loose pieces can, so airflow stays more consistent. If you’re worried about ventilation at the eaves, those blocks can help keep things open.

Drafts near the hatch are super common - sometimes it’s just the weatherstripping not sealing tight, or even air sneaking through trim or light fixtures nearby. In older houses, there’s always another gap hiding somewhere... I’ve never managed to get every single one sealed either, but tightening up what you can does make a difference over time. My heating bill dropped maybe 10% after a big round of attic work - not huge, but noticeable when winter hit hard.

I get the appeal of those inspection cameras, but honestly, I’ve found they can give a false sense of security. The cheap ones miss smaller gaps or moisture spots - had a tenant with a slow leak that went undetected because the camera just didn’t pick it up. Sometimes, old-fashioned hands-on checks (even if it means crawling around) catch more issues. As for pre-formed blocks, yeah, they’re tidy, but in some older attics with uneven joists, I’ve seen them leave small gaps at the edges. I usually end up sealing those with spray foam anyway. Just my two cents - sometimes the “easy” solution isn’t always the most thorough.

- I hear you on the cameras - seen plenty of folks trust them too much, especially the budget ones. Missed a squirrel nest once because the camera angle just didn’t catch it.
- Pre-formed blocks are neat in theory, but yeah, old houses with weird joist spacing always seem to need extra sealing. I’ve had to go back with foam or even cut custom pieces.
- Curious - has anyone tried those flexible baffles instead of rigid blocks? Wondering if they actually seal better around odd framing or if it’s just more marketing hype...

Tried the flexible baffles a couple times, actually - mostly in those older attics where nothing lines up and you’re squeezing around weird framing. They do go in a bit easier than the rigid foam ones, especially if you’ve got nails or odd angles in the way. The main thing I noticed is they flex to fit, but you still end up with little gaps sometimes, especially if the wood’s warped or there’s insulation in the way. I usually wind up adding a bit of spray foam around the edges anyway.

Honestly, I don’t think they seal *better* than rigid blocks if you’re willing to take the time to custom-fit those, but they’re definitely less hassle for quick installs. If you’re aiming for a super tight seal - like in colder climates where ice dams are a problem - I’d still lean toward cutting rigid pieces and sealing them up. For a quick retrofit or if you’re just trying to improve airflow fast, flexible baffles aren’t a bad option.

Curious if anyone’s found a brand that actually seals tight without extra foam? Haven’t seen one yet that’s perfect right out of the box...

I’ve had the same issue with flexible baffles not sealing up tight, especially in my 1950s attic where nothing’s square. I tried a couple brands (can’t remember the names offhand) and always ended up reaching for the spray foam too. One thing I’ve wondered - has anyone tried using those magnetic draft stoppers or weatherstripping tape along the edges? Seems like it could help, but maybe it’s overkill. Also, curious if anyone’s noticed a difference in airflow or moisture after switching from rigid to flexible? I haven’t seen much change, but maybe I’m missing something.