What does "hollow core" mean? Have been getting different answers.
Last input from local hardware store says it doesn't mean there's nothing in there; it means door is filled with ?? something. What?
It's hollow. Typically it may have cardboard strips on
edge, glued inside, to provide slight siffening. But basically,
hollow means hollow.
Usually it will be plywood or pressboard 1/4" panels.
A hollow core door is only for light use, interior.
Then there's solid core, which usually mean filled with
coarse particle board. It's heavier than hollow core and
might block noise slightly better, but it's still no good
for exterior use and generally pointless.
Then there are solid wood doors, which could be panel
doors or staved wood. (Glued up pieces to make a solid
slab.) In recent years, panel doors have been coming
through cheaply made, with veneer over glued-up pieces.
A panel door meant for interior (1 3/8") used to also be
usable for exterior use where a 1 3/8" door is needed, but
that's no longer the case. They delaminate with moisture
That's the selection for wood doors.
| What does "hollow core" mean? Have been getting different answers.
| Last input from local hardware store says it doesn't mean there's nothing
in there; it means door is filled with ?? something. What?
Except frame of the door so it cn be hung and lock installed, between
two thin wood panels there is nothing. If you punch it hard enough
prolly you can make a hole thru. They;re used for interior where fire
risk is not a concern unlike garage access door
Hollow core doors are essentially hollow. They have solid wood only
where needed, such as where the lockset goes and around the perimeter of
The middle of the door is only filled with corrugated cardboard glued to
the front and back panels of the door to hold those panels in place so
that they have some degree of rigidity to them. This essentially makes
it impossible to refinish a hollow core door. That's because as soon as
you start sanding it, the areas of the door over the cardboard are going
to get sanded down more than the areas between the cardboard that will
bend away from your sanding block. The result will be a ghost pattern
of the cardboard inside the door when it comes time to staining the
door. So, if you're ever in a position where you need to refinish a
hollow core door, paint it instead of staining it.
Hollow core doors are only used for interior doors because they offer no
security. Someone could literally punch a hole through the door to
unlock it from the inside.
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