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Question for all subfloor builders......

Wouldn't it be a good thing to spray in a reactive/expansion foam between
the subfloor and the contour of the underlying honeycomb?  It seems this
would insulate against noise, cold and exhaust heat and provide some measure
of support for the floor, as well.

The first thing which comes to mind is "Great Stuff" for use in drafty
cracks around the house.  Would this do the job and would it be safe to
use?  I would think a few expansion holes in the subfloor would have to be
planned so the pressure of expansion/ooze could be relieved.  This stuff
sticks to everything.  If a builder didn't want it to stick to something it
may be a good idea to put down a plastic film or conduit for wires.

I'm only thinking in two dimensions this morning and could use a third one
from other builders.

Jerry Grimmonpre'        LNC2          McHenry, IL

LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.