Should I dense pack my attic ceiling? Pros adn Cons?
![](https://secure.gravatar.com/avatar/19f2825cdfaf270aa864838910217387?s=52&d=https%3A%2F%2Fimages.greenbuildingadvisor.com%2Fapp%2Favatars%2F200x200%2Fp.png&r=g)
Hi,
I need to re-roof my entire house including removing all of the sheathing.
I see this as an opportunity to re-insulate an attic bedroom.
One contractor recommends (he has great references) to re-roof and then use dense-pack cellulose to fill the void between the sheathing and attic ceiling with cellulose. I like the idea – it seems to maximize the r-value.
Should I be concerned about moisture?
I am wondering about doing this without an ariway to vent the space between the sheathing and the attic ceiling.
I’d apreciate any thoughts or other cost-effective options I should consider.
Thanks
GBA Detail Library
A collection of one thousand construction details organized by climate and house part
![](https://www.greenbuildingadvisor.com/app/themes/greenbuildingadvisor/dist/img/modules/detail-library/thumb1.png)
![](https://www.greenbuildingadvisor.com/app/themes/greenbuildingadvisor/dist/img/modules/detail-library/thumb2.png)
Replies
Check out this paper on unvented roof assemblies. There are scenarios for all types of climates.
http://www.buildingscience.com/documents/reports/rr-0108-unvented-roof-systems/view?topic=/resources/technical_resources
Others may be able to answer your question, but would need to know where your house is.