https://permies.com/berm Let's talk about round wood timber framing joinery. Two important components: number 1: green wood is easy to carve up, but green wood will shrink a little after it is put in. As much as 3% in the length and 7% in the girth. Although a lot of experts in working with green timbers say that after decades of working with green wood they haven't seen any shrinkage that makes any difference - so they don't really think of it. But I just can't get the shrinkage out of my head. Sometimes I use the shrinkage to my advantage, but most of the time I like to prepare for the shrinkage.

number 2: round wood is 2 and a half times stronger than the equivalent in dimensional lumber.

With each structure we build, we get better and better at round wood timber framing. Thanks, in part, to experts viewing this information and experts coming and seeing our projects. To discuss the joinery in this build, please visit

permies.com/berm

To see the even better joinery of the roundwood timber framing project the following year, see

https://permies.com/greenhouse

Where two logs meet a post, we dismissed the butt joint. Where the pins would go in to the log, there is so little wood at the end of the log, the wood could break off. And where the pin goes into the post, it is so close to the edge of the post, the post could splinter.

Berm shed 1.0 made ample use of lap joints. A short lap doesn't have a lot of wood to support the spike. And a longer lap would have part of a joint hanging where the log could split. When moving onto berm shed 2.0 I wanted to do some joinery that might be a bit better.

We decided to call this a shoulder joint. An added bonus is that the roof is raised the thickness of the log.

This is a saddle joint. We are often tempted to use it, but when we do, we make sure it is a small saddle, because the bigger saddle really weakens the wood.

This is a square notch joint. Ron calls it a "lincoln log joint". Quick and it holds well.

Here is a type of lap joint that bugs me. I'm worried that the log will, in time, split. So we make ample use of a shouldered lapp to keep the log from splitting

bernal brothers animation https://permies.com/bernal

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