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Re: GSBN: Wind loads and racking




On Jun 6, 2007, at 4:19 AM, cmagwood@...:

Hey all,

This discussion of through-tieing is very interesting.
Does anybody think it's a feasible option to simply "sew"
baling twine through the wall in a grid pattern even if a
mesh isn't being used? Having the twine well embedded in
the plaster on either side of the wall is essentially all
that's happening when we tie a mesh through the wall, so
if the mesh itself is not deemed to be required in a given
setting (ie, non seismic conditions), would the meshless
sewing provide the necessary bond between skins?


That does make sense, Chris, but ONLY if the mesh is very well anchored
at each face of the wall.  If it can be yanked out (or in), i.e., away
from the plane of the plaster, then it's doing you no good.

You can anchor it with a piece of dowel or stick or rebar.  In
conventional construction in California, the mesh serves this purpose,
holding the looped end of the twine in the plaster (usually with the
help of a short piece of rebar).

Under a heavy seismic or cyclonic load, or in a very tall wall, you
could say that the mesh supports the twine, and the twine supports the
mesh -- a happy, functioning marriage. It's like:  without your
muscles, your bones can't do you much good, and vice versa -- in both
cases, a good system.  Codependency isn't always such a bad thing.

Thanks,

Bruce "Don't yank on me" King, PE
Director, Ecological Building Network  ( www.ecobuildnetwork.org )
Publisher, Green Building Press  ( www.greenbuildingpress.com )
11 Mark Drive
San Rafael, CA 94903  USA
(415) 987-7271
bruce@...

PS to Bill Steen:  How did your project at the Museum of the Native
American go?  As it happens, I visited that place one week before you
sent your note.  Got pics?  A website?




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