Too Much Humidity In Attic

During the spring summer and fall relative humidity rh in a spray foamed attic often exceeds the comfort threshold of 60.

Too much humidity in attic. When i went in the attic to bring christmas decorations down i noticed it was damp. If you ve got a spray foamed attic and you ve got high humidity here s how to fix it for good. So it s 10 degrees outside and 40 degrees in my attic with 80 humidity. 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.

I have a cap on my. I have a ridge vent and i installed sofit vents before blowing in the insulation so i am not sure where the humidity is coming from or why it is staying in there. With outside temperatures ranging between 5 f and 95 f attic temperatures range between 48 f and 92 f. If you see small black and greenish dots on material this is probably mold caused by too much humidity in your attic.

The results are that the attic temperature is close to the outside temperature but the relative humidity is significantly higher in the attic than either the indoor or outdoor readings. Do not use mechanical means electric attic fans. The attic sheathing is condensing and dripping water onto my insulation. Depending on how tight a house is constructed and the outside temperature even a relative humidity of 30 percent may be too high.

If it s much higher than 50 then you re going to start to see problems associated with high humidity. Humid air leads to condensation problems but air that s too dry can be uncomfortable or unhealthy and can lead to static shocks. I have 10 inches of blown cellulos. At higher levels relative humidity condensation can even occur inside of the house on windows cold walls or ceiling surfaces.

I installed a humidistat and it read 90 humidity. Humidity settings are another issue that can make or break the performance of your heating and cooling systems and your attic ventilation. When it exceeds that threshold by too much and for too long you could experience problems like mold growth. The normal indoor humidity range in winter should be 15.

You can also tell if the humidity levels in your attic are too high by the presence of mold. Venting a homes attic is a very important best building practices will say 50 at the ridge and 50 at the soffits unobstructed. You can purchase a weather station that measures indoor humidity levels.