Temp diff outside to attic


#1

i am having ventilation problems. the outside current temp is 26 deg. F, and the temp in my attic is 48 deg F with 49% humidity. how much is to much of a temp diff?


#2

It’s not so much the temperature as it is the humidity. You don’t want warm moist air condensing on cold surfaces at the underside of the roof.

You mention 48° with 49% rel humidity. There are tables in my college textbooks that can tell you what the rel% humidity would be at 26°. It will be higher, but you don’t want it to reach 100%.


#3

In theory it should be 26 deg in your attic also.
I don’t know what an acceptable temp difference is