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In article ,
says...

As for the doors, don't get aluminum framed anything. I'd also vote for
french doors rather than sliding doors. Why? The french doors pull in and
seal against something. the top & bottom edge of the sliding doors don't
push against anything to seal; they rely on fabric weatherstrips that wear
out & let sound in.

This could be a regional issue, having to do with energy codes, but
there are sliding doors available that have very durable non-fabric
weatherstripping that seals very effectively against noise as well as
air movement. Noise insulation and temperature insulation aren't the
same thing, of course, but you might look at sliding doors designed for
colder winters. I'd also suggest one with a deadbolt lock that keeps it
from being lifted off its tracks.

--
is Joshua Putnam
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