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<br><br><div class="gmail_quote">On Sun, Oct 13, 2013 at 7:52 AM, Topher <span dir="ltr"><<a href="mailto:topher@greenfret.com" target="_blank">topher@greenfret.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">


  
    
  
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    <div>On 10/12/2013 11:09 AM, Gennaro
      Brooks-Church - Eco Brooklyn wrote:<br>
    </div>
    <blockquote type="cite">The wood will decompose and shrink in depth, requiring
      the addition of more. Each time you do that the weight increases.
      Is that a valid concern?<span></span><br>
    </blockquote>
    <br>
    No, it's not.  Wood is mostly C<small><small>5</small></small>H<small><small>10</small></small>O<small>5</small>,
    when it decomposes it does so into things like H<small><small>2</small></small>0,
    C0<small><small>2</small></small>, etc.  All of those things
    subsequently leave a roof environment.  So decomposition, and
    shrinking in depth, reduce the weight in direct proportion to the
    loss in height.  Compaction does not however, so I would make your
    load calculations based on a fully compacted mass of the given
    depth.<br>
    <br>
    Thank You Kindly,<br>
    <br>
    Topher Belknap<span class="HOEnZb"><font color="#888888"><br>
    <pre cols="72">-- 
Topher Belknap
Green Fret Consulting
Kermit didn't know the half of it...
<a href="http://www.GreenFret.com/" target="_blank">http://www.GreenFret.com/</a>
<a href="mailto:topher@greenfret.com" target="_blank">topher@greenfret.com</a>
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