Then every lumber framed house is a fire hazard. You always have air spaces
between the floor joists.
Or did you mean something different.
I came up with an modified version of a suspend ceiling for my workshop. I
nailed strips of 1/2 " plywood to the bottom of the joists with the strips
extend 3/4 " on each side. Painted them white. Then cut pieces of fiberglass
ceiling panels to fit loosely between the joists and slip them into position
so that they sit on the plywood.
This gives me access to the plumbing and wiring in those spaces but does not
take the headroom of a traditional dropped ceiling.
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