Attic Insulation Installed Upside Down

Calculate how much you need.

Attic insulation installed upside down. I live in the sacramento valley area which gets very hot and dry in the summer doesn t get to cold in winter but foggy damp days in the 30 3 and 40 s. With the insulation upside down the kraft paper is not working as it is intended. Simple thermal analysis reveals that if you have 5 missing insulation in an attic bare sheetrock you ll have a slightly more than a 54 drop in r value. In an upside down installation where the paper faces the unheated portion of the home moisture from the humid inside air can condense and become trapped inside of the insulation during cold winter months.

R value simply means resistance to heat flow. And that s what s going on when you attempt to hang faced fiberglass. I have install new insulation becasue of a valve leak got the old stuff wet. Moisture from inside the house can now accumulate in the insulation which will drastically reduce the r value.

The damn facing obscures your work slowing down the installation and resulting in a poor insulation grade. Just buy un faced batts install them to grade 1 and build your air and moisture control systems in another layer big separate discussion. If your crawlspace looks like this fear not. You don t say what r value the insulation has but chances are it s adequate for a floor in your climate zone.

If you want to add foil insulation to an existing roof you can still do it by going into the attic and. So i am not sure which way to install the new insulation. Choose your insulation type. Check pipes and vents.

This will likely result in fungal growth mold and rot. These thermal defects undermine the r value of your attic insulation. For proper installation of roof insulation you need to do it before the roofing goes on.