What happens is people put too many products on their roof.
Too much humidity in attic.
By adding moisture to the lower floor you increase the partial pressure of the water vapor which pushes it to areas of lower vapor pressure like the attic.
If you raise the attic temperature the rh in both places would be the same.
In theory if you install a small exhaust fan in the gable wall of an unvented attic along with a passive duct or grille that allows conditioned air from the floor below to enter the attic as makeup air the humid air in the attic will be exhausted and will be replaced with less humid air from the home.
If left untreated it can damage critical structural elements of the home such as the trusses and rafters ruin insulation damage any stored belongings and lead to the formation of potentially toxic black mold.
How to manage humidity in your spray foamed attic 1.
So they equalize pretty quickly.
It could be that despite having done what.
Condensation in the attic is a serious problem that must be addressed by homeowners.
Cold outdoor temperatures especially below freezing can wear on your furnace.
The solution is to air seal between the attic and the heated space below.
If mechanical systems in your home create a negative pressure environment you could.
Venting a homes attic is a very important best building practices will say 50 at the ridge and 50 at the soffits unobstructed.
What stands out is the high relative humidity inside the house.
Ideal attic temperature and humidity settings cold outdoor temperatures affect attics.
Quelch the heat wave.
Hot summer weather poses the opposite problem for maintaining recommended attic temperatures.
The difference in the two spaces is the dry bulb temperature.
All it takes to grow mold in your attic is stagnant humid air.
And when you put too many products on your roof that s improper ventilation.
When the air is warm it holds a lot of moisture so the relative humidity was low and there was no moisture problem.
Seal around the chimney and all penetrations including the access door.
As with pretty much all home improvement projects your contractor might.
Check for negative pressure.
Do not use mechanical means electric attic fans.
If you stop the air leaks you will solve the problem and save lots of energy.
At 48 52 you re at the upper tier of the recommended 35 50 during heating season.
Roof ventilation keeps the air moving and stops mold from growing but too much ventilation can be just as bad as having none.
As a certified licensed home inspector it is not correct to say too much ventilation is bad for an attic unless rain moisture is getting in.
