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Started By
Message
Attic Insulation Questions
Posted on 1/31/23 at 8:23 am
Posted on 1/31/23 at 8:23 am
Good morning.
I have an older house with a smaller attic and I'm looking at re-doing the insulation.
I have old batt insulation up there now but it's compressed in a lot of areas. I can see 2-3 inches of my ceiling joists (actual 6 inch joist) through out. It being an older house, I'm hesitant to blow in 10-12 inches of fiberglass because there's stuff in the attic I'd still like to do (plumbing, electircal, etc).
Looking for opinions on whether or not to go open/closed cell spray foam direct to the decking and remove all the old insulation.
Open cell - my dad got this done on his house and it helped but not as much as he would've hoped. Everything I've read about open cell is that heat still transfers through. Additionally, not sure if I want to go open cell with the it's ability to absorb moisture/humidity.
Closed cell - I'm leaning this, but it's a good bit more. Also reading conflicting reports on how thick it needs to be.
Appreciate the feedback!
I have an older house with a smaller attic and I'm looking at re-doing the insulation.
I have old batt insulation up there now but it's compressed in a lot of areas. I can see 2-3 inches of my ceiling joists (actual 6 inch joist) through out. It being an older house, I'm hesitant to blow in 10-12 inches of fiberglass because there's stuff in the attic I'd still like to do (plumbing, electircal, etc).
Looking for opinions on whether or not to go open/closed cell spray foam direct to the decking and remove all the old insulation.
Open cell - my dad got this done on his house and it helped but not as much as he would've hoped. Everything I've read about open cell is that heat still transfers through. Additionally, not sure if I want to go open cell with the it's ability to absorb moisture/humidity.
Closed cell - I'm leaning this, but it's a good bit more. Also reading conflicting reports on how thick it needs to be.
Appreciate the feedback!
5
Posted on 1/31/23 at 12:12 pm to PureBlood
All spray companies recommend open cell on the underside of a roof. Closed cell for walls and under a floor on pier and beam building.
Posted on 1/31/23 at 12:28 pm to PureBlood
quote:
I can see 2-3 inches of my ceiling joists (actual 6 inch joist) through out. It being an older house, I'm hesitant to blow in 10-12 inches of fiberglass because there's stuff in the attic I'd still like to do (plumbing, electircal, etc).
Looking for opinions on whether or not to go open/closed cell spray foam direct to the decking and remove all the old insulation.
How does this solve your problem?
Is the idea that foam will be less thick so you’d still be able to do whatever additional work?
Open cell foam is similar in R-Value to fiberglass. Closed cell is better, but for R-38 you’re still looking at about 6-7”, which is above your 6” joists.
What’s stopping you from doing the other work first?
Posted on 1/31/23 at 12:34 pm to PureBlood
On all my projects, we do open cell at the roof roof @7" min thickness. However if your house is not adequately air sealed prior, and if your walls are not adequately insulated, it will not make much of a difference.
Posted on 1/31/23 at 7:43 pm to PureBlood
No closed cell on a roof deck
Posted on 2/1/23 at 10:26 am to PureBlood
Replace old batt insulation with Rockwol.
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