Should fiberglass pieces be used to seal off openings before installing blown-in cellulose to prevent clogging of soffit vents?
Asked by Tristan Leroux 
4 months ago
Last Updated: August 3, 2024
Do you think it would be a good idea to seal up these openings with fiberglass pieces before we add the blown-in cellulose insulation to prevent it from blocking the soffit vents?
That’s actually a decent method. If you’re able to access it from the exterior, you can use cardboard or foamboard to block it off
It’s important for air to flow freely from the attic to the outside vents; otherwise, the vents serve no purpose!
The blown insulation will fill in those gaps, if they’re not already covered. Can you not see the picture? You need fiberglass to seal off the gap where the plastic vent allows air to pass through.
Hanging out near the vents, yeah that’s pretty typical. My bad, I might have misunderstood the previous post. Sorry about that!
Apply spray foam to seal the bottom of the baffles
Without what? Haha
Make sure to install rafter vents in each bay before adding the insulation
https://www.homedepot.com/p/ADO-Products-Provent-14-in-x-4-ft-Rafter-Vent-UPV1448050/100533902
Wait, aren’t those the plastic vents on there? Just a different type
Wow, those look like Styrofoam… I’ve never seen plastic before
It’s best to seal the openings afterwards. Otherwise, the insulation blowing in may cause the drywall to bulge and pop off the studs.
Did you seal the openings after the blow job?
There are varying opinions on venting the soffit. In a hot climate, it might be a good idea if you also have a ridge vent. But in colder climates, I would recommend keeping the soffit tightly sealed.