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Re: R value for log walls

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The AITC Timber Construction Manual (in both the 3rd and 4th Editions) shows
a method based on specific gravity and moisture content. It is based on
fundamentals from American Society of Heating, Refrigerating and
Air-Conditioning Engineers, Inc.
 If you need additional assistance, contact me at bdpooley(--nospam--at)

Bruce Pooley
Timber Design
3448 South Newland Court
Lakewood, CO 80227

----- Original Message -----
From: Peter McCormack <pmac(--nospam--at)>
To: <seaint(--nospam--at)>
Sent: Wednesday, December 08, 1999 12:31 PM
Subject: R value for log walls

> I am in the process of developing a MathCAD template for
> determining seismic loads per UBC.
> However, I need to determine a realistic "R" value to assign to log
> walls acting as both shear and load bearing walls. Obviously, a wall
> constructed of logs stacked 1 above the other has a higher density
> than a light framed shear panel, but is not as dense as a concrete
> or masonry log wall.
> Does anyone have any suggestion, is there a calculation method to
> determine it based on the material density???
> Any help will be appreciated
> Peter McCormack