Roof vapor retarder ?

[architectco]

Hi,

From what I understand, vapor retarder should be on the warm side of the insulation in walls. Is this rule of thumb apply for roofs?

thanks

[Raja]

Yes, warm side.

http://homeinspectorsean.com/the-attic- ... ncerns.php

For a deeper dive if you're interested....

https://www.jlconline.com/how-to/insula ... es-or-no_o
https://buildingscience.com/documents/d ... entilation