High humidity in house after insulation
I am hoping someone might be able to shed some light on a humidity mystery. I had my attic insulated with blown cellulose and air sealed ( I hope). Since that time my home has gone from around 45-48 % RH to 52-56% RH humidity ( 73-74 degrees). Also we have an encapsulated conditioned ( dehumidifier and supply vent) crawl with a radon system. The roof has radiant barrier sheathing installed when the house was built 8 years ago.
We have several knee walls ( facing south and east) which were spray foamed in addition to 13″ of cellulose. I did notice the original batt insulation was left in the slope portion of the roof ( just above knee wall) with a twisted baffle left in place to act as a damn for the blown cellulose. On the other knee wall, spray foam continues all the way up, blocking the top of the knee wall ( no air circulation or baffels)…which is in another small separated portion of the attic.
I am wondering if I should remove the batt insulation for better ventilation, or something else could be causing the high humidity that I should check.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part