Spray foam insulation question

I had spray foam insulation installed in Aug 202 in a 2-story house with 2-zone HVAC. Natural

gas hot air heat with Aprilaire humidifier in the basement for 1st floor & air handler in Attic for 2nd

floor. First winter season for spray foam insulation. Experiencing multiple nail pops, ceiling cracks
on both floors & gaps between crown molding & ceiling. Nest thermostats indicate humidity

ranges from. 36-48 percent. Use room humidifier in the 2nd-floor bedroom at night. Is low humidity

causing these issues, or related to the spray foam insulation? I experienced gaps in crown

molding & ceiling before installing the Aprilaire, but nothing like this for over a decade. I have

read that high humidity can be a problem with spray foam insulation, so very confused.

 

When we were making our house more energy efficient, the contractor who did our radiant barrier in the crawl space mentioned that spray foam is only good in houses designed for it because of the humidity factor. It seals out moisture but also traps it...especially in inadequately ventilated spaces. He mentioned that once moisture is trapped mold starts and there's the beginning of major headaches.

With nail pops and cracks going on, it sounds like your materials are expanding from moisture absorption.

 

thank you so much for your suggestion

 

Is your attic conditioned or have a ventilation fan? What about the rest of the house, does it have a fresh air intake system?