My home was built in the 1930s.
I recently pulled up my carpet to get it replaced. When I did this, I noticed that the plaster walls stopped half an inch above the hardwood floor. It looked very deliberate: there was no lath, just a big gaping hole. It opened the room up to the wall cavity. It seems that the gap was only present on exterior walls. Also, the walls are uninsulated.
Is there a reason why this would have been done?
Also, was I wrong to fill the gap with gap filler foam?