Soundboard drydown for installation

[Richard Brekne]

For clarification please.  Are you saying that as the panel takes on 
humidity the ribbed assembly will experience a reduction in crown... and 
not increase ? 

RicB


    So the assembly takes on moisture... not only does the rib expand as
    a result by but a negligeable amount but whatever expansion there is
    will tend if anything to make it bend downwards and *_reduce the
    crown_.*

    ......and there will be significant expansion, will result in
    compression of the wood within or beyond the yield point, but any
    power it might have to make any difference to the crown will be
    _*completely** **negated by the action of the rib and the forces to
    which
    this is subjected.*_