Hi learning more about insulation & ventilation than wanted to
We have two car attached garage. Unheated garage only used for parking cars. Live in Ohio with lots of snow coming into garage. Garage ceiling had insulation. Have ridge vent and soffits in attic of garage. Never had a problem with garage roof or anything else with garage for that matter for 30ish years.
Last year a contractor blew insulation into three external walls of house and the two external walls of garage instead of wall between house and garage,(which happens to be wall of our master bedroom & bath). We are having that wall insulated this Fall.
Now we have a completely insulated garage. Odors stay in garage, moisture is a problem and paint is flaking off walls. We have been told that we either need to take the insulation out of the two external walls or put in a ventilation system and/or dehumidfiers. Do not want fan noises from garage to come into bedroom.