Junior Binns

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since Jun 13, 2011
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Recent posts by Junior Binns

This is a great place to find out properties of different woods in North America.
Softwoods of North America
There is also one for hardwoods.
Very informative paper and a very helpful site on understand wood in general.

Those span tables from AWC.org could work as long as the log encloses the cut lumber shape (I think this is what Cactus Rex mentioned earlier) since roundwood is stronger that dimensional lumber. Not the most material efficient, but it would work!

Sadly those span tables www.uaf.edu/et cetera... are only for trees in Alaska. I am not in Alaska. Otherwise those would work.

I got Ben Laws new book Roundwood Timber Framing (I believe it is called) but have not found anything on engineering . . .
He did give reference to a paper that went into the structural properties of wood. Mabye I can dig that out of my computer files later.
Good book though. He really builds those buildings natural. No nails. He just uses wood oak pegs help hold the roundwood together. Mostly the fancy mortise and tenon joints to the work. The guy is amazing. The Log Construction Manual wips out the chainsaws and such Still, if you get the general idea from the book I think an axe can work.

Okay, back to research . . .

Alright, I have been doing research. So far this is what I have . . .

There are many books on how to assemble a gable log roof. The Log Construction Manual does a good job explaining how to build a log home (including the roof), but I have not finished reading it yet. He suggests highering an engineering (that is what he does), but I am sure engineers are expensive. At the end of the book are pages of resources this guy, Mr. Chambers, uses. One book I am going to have to buy is Log Span Tables by Allan Mackie. It costs somewhere around $31 and can be found at the LogAssociation.org. This book should do the trick if you can calculate the loads on the roof for each member.

But that is a gable roof. What about Reciprocal Roofs? A fantastic idea which I can not figure out how to engineer! There is a book call Reciprocal Frame Architecture available at amazon.com for around $50 (yikes!) that seems to be a great book after looking at the online preview through google.com. Still, I haven't got it. Still doing internet research to get around that price tag. I did find a paper on reciprocal roof engineering, but it is hard to understand (I am trying to make sense of it)... here it is if you understand math really well. Systemic Behavior of Plane Reciprocal Frame Structures
I was thinking a gable roof with a living roof on top (6" thick compost), which will give a slope below 30 degrees.

What I am really looking for are numbers to plug into some equations.  The ASTM standards contain information on testing, but i have not read them.  I do not really want to spend the $34 for a couple page paper... but might have to.

How would you go about building a roof and making sure it stays up using the first paragraph information?
Is there any information out there that can be used to make sure a roof stays up?  Books?  Websites?