[CAUT] soundboard "stress test"

David Love davidlovepianos at comcast.net
Tue Apr 20 09:02:13 MDT 2010


The issue here is not so much the finish but what happened to the panel and
the glue joints when the fire toasted the board down to some very low EMC
and heated the rib/panel glue joints.  While I am not an expert in this
area, my recent conversations with fire restoration individuals suggest that
once the flames actually touch the surface (especially the soundboard
directly) the potential for failure increases exponentially and the piano is
generally written off as a total loss unless complete remanufacturing is
planned and justified by the piano's inherent value.  While there may be
some instances of "survival" the acoustical properties and longevity of the
glue joints (this can be in the rim and support beams as well as the panel)
come into question.  

David Love
www.davidlovepianos.com
 
 
 
In a message dated 04/17/10 14:21:15 US Eastern Standard Time,
akwright at btopenworld.com writes:
Our restoration shop just received a piano that's been subjected to a   
pretty bizarre accident (or perhaps vandalism - we don't know) at a   
school. We believe a fire burned in a rubbish bin directly underneath   
this Model A (number 400028). Below you can see the results; the   
soundboard got so hot that the varnish bubbled on the top side, yet   
the underside suffered no actual charring or burning (note in the   
second photo how the soot has been wiped away by my thumb in one   
spot). The last two photos reveal that enough soot was pouring up   
through the two holes in the underside (at the sustain pedal and the   
plate bolt) so as to leave a residue. 

It seems to me this would be a tricky thing to pull off even if one   
were deliberately trying to do it; specifically I mean getting the   
board heated just enough to bubble the varnish, but not so hot it   
that things caught fire and burned. A pretty flukey event! I suppose   
there must have been just enough stuff in the bin to burn for just   
long enough (and hot enough) to cause only this amount of damage. 

The soundboard seems fine, still has plenty of power etc. We'll be   
replacing it, since the instrument is covered by insurance and it   
seems the prudent thing to do. But I wonder if anyone with more   
knowledge than I about internal wood structure will have an opinion   
on whether any lasting damage to the board will in fact have   
occurred, and if so how it might affect the tone or longevity? 

Sincerely, 

Allen Wright 
London, UK 

 



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