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If this is an older home and it had hardwood floors when you bought it, odds are the floors were originally carpet so the doors were cut to allow for the thickness and the renovators didn't spend the extra money to replace the door slabs properly. A gap is fine but 3/4-1" is about 2x what it should be.
When we were building under the Building Science Program called EFL, we used a 12" duct that had a register on the inside of the room in the ceiling at the door with a short duct to another register in a hallway, pretty much just a duct over the wall. This allowed for proper ventilation and allowed the required circulation. Air weight was recorded and it would be 1-2 pascals of the hallway. But cutting the doors off is the norm for most houses although a 1" cut under a 32" door is not usually near enough. If you weigh the air, it is way off of neutral. Circulation, humidity, and temps will suffer.
This is a major issue in my opinion and not the correct solution. We want to seal our bedroom off completely from noise in the rest of the house. STC 50 rated acoustic door installation so even 1/8" anywhere is unacceptable. It's a new home, but still needs to be done and temperature perfectly controlled.
What's the ideal solution for air flow still? A series of turning ducts or...? A duct leading into the room next door? [there would be no noise coming from that room as it would be empty].
Our house was newly built in 2013. I have the same space between all my doors and floor as the OP talks about. I found it quite weird when we first moved in. I heard my girlfriend fart when she was having a pee in our bathroom, so I am now very careful not to do the same thing if we have people over visiting lol.
It didn't take me long to realize that the space is VERY handy when I am mopping my floors, (wet or dry mopping). I don't have to pull the door away from the wall to mop behind it. My mop slides nicely under it, so now I think that space is a GOOD thing.
Jesus the quality of construction of homes is so pathetic. That should not be a thing! Every room should be temperature controlled to within a degree, it should be silent, and it should be sealed. The way they slap things together is depressing.
I don't know how anyone tolerates just a double pane window between outside and inside. I can't imagine just hearing lawnmowers because of faulty interior soundproofing and just going la Dee da that's how it goes. No thanks! Lol
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