For exterior solid doors I have always seen 3 hinges. But what about
interior doors? In particular those 6 panel masonite doors. These
are heavier than the regular hollow doors but not by much. My house's
doors all have 2 hinges, but when I look at other people's houses I
see three. Any differences in the size of the door? For example 2.5
feet width is 2 hinges but 3 feet gets 3 hinges?
The number of hinges may just be for appearance in some
homes. But normally it depends on the weight of the door.
Regular hollow core doors need only 2 hinges. Solid doors
need three hinges. Maybe the 3 hinged doors you see are not
hollow core. Size of door doesn't matter, besides it would
look very strange to see a mix of 2 and 3 hinge doors. Only
my exterior doors have 3 hinges --2 metal foam core, and 1
solid core to the garage.
I just installed 4 of the 6 panel masonite doors. They seemed about
twice as heavy as one of the cheap hollow-core doors I was replacing and
about as heavy as the older (& nicer) hollow-core doors.
Anyway, with 3 kids I was afraid of flex from running into the doors etc,
so I used 3 hinges. The information on the back of the package indicated
3 hinges as well, but that could just be to increase sales.
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