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RE: Moisture Content in Timber

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I believe MC >16% is for glulams.

> -----Original Message-----
> From:	"Richard Flower" <RLFlower(--nospam--at)worldnet.att.net>@ENRON@EES 
> Sent:	Tuesday, July 18, 2000 8:05 AM
> To:	<seaint(--nospam--at)seaint.org>
> Subject:	Re: Moisture Content in Timber
> 
> This one is for all you wood experts:
> 
> The 1997 edition of the National Design Specifications, Section 4.1.4
> appears to suggest a 19% moisture content as the expected service
> condition
> for structural timber. However, the 1997 UBC Table 16-E footnote 1 says
> "Seasoned lumber is lumber having a moisture content of less than 16% at
> the
> time of installation...". If both these statements are accepted as
> guidelines for design, then, does that mean that timber cannot be
> considered
> seasoned when used for structural purposes?
> 
> This makes a considerable difference in the design of long spaned members.
> 
> Regardless of how structural lumber is specified for a project, much of
> the
> structural lumber that is delivered to a construction site is delivered
> "wet". Yet, these members can be expected to dry out over time - in fact,
> much of the moisture content is lost even before the members are placed in
> service. Also, members of relatively smaller cross-section would "air-dry"
> more quickly than members of larger cross-section. Yet, I have not found
> provisions that consider this fact.
> 
> Any comments on this issue would be appreciated.
> 
> -Richard L. Flower, P. E.
> 
> 
> 
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