High humidity in attic after open cell foam install is a well-known topic and discussed in other threads.
I wanted to post my experience and see if anyone here had any thoughts.
I have a larger home (5000 SF, three floors) that had open cell foam installed 3 years ago. 2 years ago, we noticed significant humidity on the top floor and a significant musty smell. After consultation with an installer, we installed an Aprilaire 70 dehumidifier, but still recorded humidity levels up to 80%. The HVAC installer upgraded our dehumidifer to Aprilaire 95 a few months ago with better results with a set point of 54% but humidity up to 64-67% during the mid afternoon.
My concern is increasing outdoor humidity during the summer, although the days with highest humidity recording were days that were sunny with highs around 90. We are in coastal SC.
My installer sent me an article from greenbuildingadvisor.com that discussed this phenomenon and some experimentation showed that the humidity may actually be coming from the inside the house, not outside. I find this hard to believe but wondering how this changes anyone's approach.
Any comments or suggestions are appreciated.
I wanted to post my experience and see if anyone here had any thoughts.
I have a larger home (5000 SF, three floors) that had open cell foam installed 3 years ago. 2 years ago, we noticed significant humidity on the top floor and a significant musty smell. After consultation with an installer, we installed an Aprilaire 70 dehumidifier, but still recorded humidity levels up to 80%. The HVAC installer upgraded our dehumidifer to Aprilaire 95 a few months ago with better results with a set point of 54% but humidity up to 64-67% during the mid afternoon.
My concern is increasing outdoor humidity during the summer, although the days with highest humidity recording were days that were sunny with highs around 90. We are in coastal SC.
My installer sent me an article from greenbuildingadvisor.com that discussed this phenomenon and some experimentation showed that the humidity may actually be coming from the inside the house, not outside. I find this hard to believe but wondering how this changes anyone's approach.
Any comments or suggestions are appreciated.
