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jcmcnabb
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# Posted: 3 Dec 2025 11:43pm
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Hi all,
We're building a 24 x 28 arched cabin (kit from arched cabins llc) in southern Arizona. Hired a backhoe to dig trenches for our piers (pr-cast stackable EZ-Tubes, 3 rows of 5) and he dug them slightly out of parallel. We will be putting short 6x6 posts on the piers to support double 2x12 beams.
I'm trying to figure out the best way to get the beams as parallel as possible, with the outer beams being about 8" out of parallel (north side about 8" closer than the south).
I have very little wiggle room with the post bases on the piers, so the best solution I've come up with is to notch the outer side of the north posts to separate the beams and notch the inside of the south posts to bring them closer. The intermediate posts would have basic Simpson brackets.
This gets me much closer to parallel, but I want to make sure I'm not missing anything (e.g. is there something wrong with notching opposite sides of posts).
Thanks!
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Grizzlyman
Member
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# Posted: 4 Dec 2025 05:08am
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Man that sucks!
Generally you’ve got the depth of the joist that you can cantilever the joists over the beam. So if it’s 2x 10 joists you can cantilever ~10” over the beam. The beams doen’t have to be perfectly perpendicular at the end of the day.
Is you 8” too wide or too skinny for the dimensions of your build? If it’s too wide, then you could just have very little cantilever on the wide side and a larger but still appropriate cantilever on the skinnier side.
If it’s too skinny then I’m not sure what you could really do other than adjusting your build dimensions.
As long as your joists are square you’d be fine.
I’m not sure about notching opposite side of the post… whether that would cause some rotational force or not.
…My .02
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jcmcnabb
Member
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# Posted: 4 Dec 2025 05:20am
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I appreciate the $0.02!
You raise a very important fact that I omitted, which is that I have designed the subfloor to overhang the beams on the East and West sides. So I can make the subfloor square without issue! My concern is mostly about uneven weight distribution on the beams due to the uneven overhang from them being non-parallel.
The opposed notching method get's me from 8" difference to about 2" difference.
I think you are right that it probably doesn't make a big difference, especially with a relatively light weight structure.
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