The 4" spacing is pretty standard but local codes may be different. You
didn't mention other details about this deck. If the deck surface is less
than 24" above grade, you may not need railings. If higher than 24", not
only do you need railings but they will usually need to meet other specs.,
i.e. the top rail must be at least 36" above the deck. If there is a lower
rail, it must be 4" or less, above the deck. Other specs. refer to
materials used. Time for some more homework and perhaps a cup of coffee for
the local inspector.

"TH" wrote in message
k.net...
I am rebuilding the railings on an existing deck and am wondering if there
is a "recommended" spacing for the balusters?