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Re: Masonry Wall Anchorage to Flex. Diaph.

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I have not tested an existing anchor in brick masonry in years.  Testing
virtually always showed the anchors to have little or no significant
capacity.  It seems to have been rare for the masons who set the anchors to
take care to assure that the anchor was securely embedded in solid masonry
or grout.

Many epoxy adhesive manufacturers have ICBO-ES approvals for use of threaded
rods embedded in their adhesive in holes drilled into brick walls.  One is
CIA Epoxy Anchors by Covert Operations, Long Beach CA.  Simpson Strong-tie
also makes epoxy anchors.

If plates on the outside of the wall would not be objectionable, they
provide the most positive restraint for the wall.

The connections to the wood framing should not be eccentric, as would result
from using Phd's.  A large block [6x6] spanning between two joists and
restrained to the joists by ledger blocks works well to secure a threaded
rod extension from the anchor in order to secure walls to joists
perpendicular to the wall.  For securing a wall parallel to joists, a
threaded rod that passes through several joists, with a set of tightly fit
blocks adjacent to the rod works well.  Use a Simpson BP plate at the
interior end of each threaded rod.

Nels Roselund
Structural Engineer
South San Gabriel, CA

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