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Log Home Seismic R Value

Log Home Seismic R Value

Log Home Seismic R Value

(OP)
Currently designing a log structure that is a real menagerie.  Uses an Insulated foam sandwich panel roof with log and stud walls, TJI floor joists, glulamms, parallams, and an ICF foundation - a real hybrid.  That said...

I saw the post by RockEngineer in 2006, but has anyone come across any more recent guidance than the 2006 article in Structure Magazine on the appropriate R value to use for log homes?  

I heard a rumor that there was some new design guidance out there for log structures.

Mike McCann
MMC Engineering
Motto:  KISS
Motivation:  Don't ask

RE: Log Home Seismic R Value

I hope you find some more info.  If you do let us know.

If I would have suggested a person to ask it would have been you.  I am always amazed at your breadth of knowledge.reading

RE: Log Home Seismic R Value

Don't know what R value to use. Maybe the R value for "other systems".  

To me, the more important question is what is the lateral load path?  I don't see a natural lload path for the lateral loads in a log style home.  Though I know very little about them.   

RE: Log Home Seismic R Value

Wrong R.  I didn't read title close enough.   

RE: Log Home Seismic R Value

(OP)
I can't find anything more to date and neither can my sources, so I guess, with the range of 2.8 to 5.3 from the article, and considering the methods of joinery used in this structure, I am going to use a bearing wall system with an R reduced from 6.5 to 5.0 and see what happens.

Thanks all for checking, and the complement Rock.

Mike McCann
MMC Engineering
Motto:  KISS
Motivation:  Don't ask

RE: Log Home Seismic R Value

(OP)
FYI all:

I did find out that unlike ASCE 7-05 or the IBC 2006, the IBC 2009 edition refers to a new publication, ICC 400-2007, that is available on the ANSI website below for $25.00.  

I have not seen it yet, but understand that it probably does not address the R value issue.  Apparently, it deals with Log Structure design and construction "guidelines", whatever those are.

http://webstore.ansi.org/RecordDetail.aspx?sku=ICC+400-2007

Mike McCann
MMC Engineering
Motto:  KISS
Motivation:  Don't ask

RE: Log Home Seismic R Value

http://www.structure1.com/loghomes4.htm

If you follow the above link, it will take you to a page that shows the structural requirements from ICC400-07.

At the bottom of the site, it does adress R and indicates that a value of 4 is reasonable.

RE: Log Home Seismic R Value

Sorry, I read the site again.  The R=4 reccomendation came from ICC400-05.  

I have ICC400-07, and it does not seem to provide this value.

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