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RE: Anchorage to Cobbled Foundation

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Why install anchors?  If it has worked for 100 years why change?  There
may be adequate friction developed to resist horizontal loads.  Could
you mortar anchor bolts in the joints of the stone?  Is the mortar lime
or Portland cement?  It is most likely lime.  If the mortar is being
replaced it is recommended the same type of mortar be used.  There is
also adhesion between the mortar and wood.  Is the sill plate being
replaced?

Gary Loomis, PE

-----Original Message-----
From: lrhauer(--nospam--at)earthlink.net [mailto:lrhauer(--nospam--at)earthlink.net] 
Sent: Wednesday, April 19, 2006 1:30 PM
To: SEAOC
Subject: Anchorage to Cobbled Foundation

I am working on a project to anchor a 100 year old wood framed 2 story
house to the existing cobbled sandstone foundation, (there are no
existing anchor bolts- just a wood sill plate setting on top of the
foundation with drypack between). It is a voluntary upgrade, so does not
have to conform to any code requirements. The foundation is randomly
laid sandstone cobbles with fairly poor mortar quality after 100 years.
My question is:

Does anyone have experience in what a reasonable value would be for
epoxied threaded rod anchors attaching the existing wood sill plate to
the top of the sandstone cobbles, (shear parallel with the footing)? Any
additional advice would be appreciated.

Thanks in advance.


Larry Hauer, S.E.



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