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RE: Lamella Structures

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That seems logical.

I actually found a seaint thread that seems to imply that there are no engineering references to be had, only some proprietary sizing manuals only from early last century.   I can’t believe such a manual would satisfy a skeptical plan checker.


From: Garner, Robert [mailto:rgarner(--nospam--at)]
Sent: Tuesday, August 19, 2008 10:55 AM
To: seaint(--nospam--at)
Subject: RE: Lamella Structures


Somewhat of a non-answer, but my memory recalls they act as an arch, and need axial support at the base just like an arch.  I think this memory is from my hippy days and the Whole Earth Catalog that used to have a section on self-sustaining (nothing changes) structures.


Bob Garner, S.E.


From: Donald Bruckman [mailto:bruckmandesign(--nospam--at)]
Sent: Tuesday, August 19, 2008 10:49 AM
To: seaint(--nospam--at)
Subject: Lamella Structures


I came upon a lamella roof structure recently out of short lengths of 2x4 and diagonal sheathing, (circa 1940s, I’d guess) and it looked like it would be, on a small (residential) scale at least, relatively easy to put together, create large open spans without large beam sizes, and had an altogether cool look, but I immediately thought, “Lord, how would one calc such a thing to prove to the AHJ that it works?”  I checked the NET and could find a few projects with it, but no references about how to design them and a few sites that seemed to imply that small errors in assembly could create stability issues.  


Undeterred, I reason, “Heck, if 3 fingered carpenters in the field were throwing them up 70 years ago and they are still standing, how difficult to do and how unstable could they be?” 


Does anyone know of any books or literature titles that describes the engineering process(es) involved in designing stick framed lamella roof structures?  Seems like a lost art form…