I decided to remove the original 1/4" thick "fiber-paper" pads that seemed to be spot glued onto the metal floor boards in order to improve my sleep (brushing on a couple of protective layers of POR15 black paint onto freshly scraped & cleaned metal is strangely relaxing). The great news was I found ZERO rust holes in the cabin's floor boards (surface rust only). But unfortunately no matter how gingerly I pried and lifted, some of these pads tore (see pics). What is this material? Is it still made and sold here in the USA? If possible I'd like to retain the same materials under the eventual carp 
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What was the primary functional purpose of these thick fiber pads ----to provide an extra layer of "cushioning" below the carpet? To act as a moisture barrier between the carpet and metal floor pans? To help deaden sound? These pads positively contribute to each of these purposes but so does the dry tar skim material Hudson applied directly to the metal floor boards.
Sound deadening!
Ken, I hear you(!) Chalk one up for lame humor,,,Maybe the material is a type of felt? It seems to have the characteristic "matted fibers" of felt but I don't think they are wool fibers. They seem more like wood based fibers matted together like a thick cardboard impregnated with an oil based derivative. Anyhow I should probably just replace it with space age Dynamat foam material and chalk that decision up for the (3) rocket emblems on the Hornet! Thank you.
Robert those underliners were once flexible. My 22k mile 54 Hornet Sedan was found in 1973 in a garage. When I restored that car those underliners were flexible. I am not aware of the components used to manufacture, but at that time my guess would have been cheap felt. BTW on my webpage is a alternative to Dynamat that works the same and is much cheaper. A real rebuilding conundrum, thanks for posting!
Ken ---Interesting to hear the pads were originally flexible as the ones in my car have look more like stiff burnt toast. Years under a beating California sun will do that...I'll check your excellent web page for the alternatives. Thanks again.
That material is called waffle board and is reproduced in 2 thicknesses by the Ford people.
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