A properly insulated, constructed, and sealed house should have good climate control, but sometimes you find that one aspect or another seems off. Maybe the house is now too hot despite the use of an air conditioner, or the air seems stale. If your attic has begun to experience problems, such as high humidity, you need to address the problem now.
Warm Air Leaking in From Downstairs
One of the more common causes of excessive attic humidity is that the seal between the attic and the upper floor of the main living space has gaps. Maybe a seal around an opening in the attic floor for a pipe is in bad shape, allowing hot air to flow in from downstairs. That heat, if the attic is cold, creates a lot of humidity and even condensation. To solve this, you need to have all openings from downstairs resealed to ensure no hot air creeps up into the attic. Also have the attic ventilation checked to see if it's been blocked somehow.
Power Ventilation Broken
If you had a power ventilator installed in your attic, it's possible that the ventilator has broken down. This would result in stuffy, possibly more humid air sticking around in your attic. Call a ventilation repair technician immediately because consistently high humidity in your attic can encourage mold growth.
Home Dehumidifier or Air Conditioning Breaking Down
Your home's air conditioner acts as a dehumidifier, and some homes have a separate dehumidifier system in place. These systems may have broken down and stopped removing humidity. As with heat that leaks into the attic and increases humidity, the inability to remove humidity can lead to mold proliferation. Get the appliances checked out immediately.
It's a Really Bad Season
Finally, it's possible that the weather itself has just been incredibly humid, and that's overwhelmed all your home's defenses. Humidity can enter your home when you open doors, and it can seep in under doors and through window weepholes. Have your ventilation and air conditioning inspected to ensure both are working and dehumidifying your home as best they can given the circumstances.
If your attic doesn't have the type of insulation that requires total sealing, then it needs to have very good ventilation along with appropriate humidity control. Check the power ventilator, and if that's still working well, start looking at gaps that allow air leakage, as well as how the other appliances in the attic are working. Contact a company, like Insulation Pro's, for more help.