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Author Topic: Piecemeal post and beam frame assembly  (Read 1985 times)

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Online Don P

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Re: Piecemeal post and beam frame assembly
« Reply #20 on: December 09, 2018, 07:09:52 PM »
We've gotten 18" of snow today I ought to cut a couple of 1' squares out and weigh it.

That isn't really a good connection. Even a strap over the ridge, down the backside and under the rafter to a timberlock there would have better strength. I'd personally rather have something supporting the rafter from the bottom.

Nails and timberlocks, the timberlocks are going to hook up right now under load, the nails being smaller and more ductile steel are going to slip some amount before hooking up. Mixing fasteners and assuming they are helping one another can be tricky.

Beveling a 2x to sit on the top of the ridge at the roof angle, a cant strip, is another way to get that bearing under the rafters if you set them on top of the ridge. Doug fir has a bearing capacity in edge grain of around 500-600 psi.

The strap requirement is really to hold the planes of the roof together down to the connection to each wall then down to the foundation connection. The rafters could be offset from side to side enough for them to lap over the ridge and then connected to each other at the lap.  Think of the building inflating, that is what the strap or lap connection over the top is about. In hurricane Andrew you might remember seeing roof planes blowing around. The toenailed connections of rafter to ridge let go, the strap or lap holds them together. Doesn't hurt to catch the ridge on the way over. The other thing was entire trussed roofs coming off, that is the tie between roof and walls.

A laborer works with his hands
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An artist uses his brain, his hands, and his heart


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