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willywilly2020
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# Posted: 20 Jun 2020 13:35 - Edited by: willywilly2020
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Hi friends!
I poured my pier foundation a couple weeks ago. Woohooo! Excited for it to cure and to start my build.
That said, I made a pretty stupid mistake already. I got advice from a builder friend on spacing for my sonotubes, and I KNOW they are too far apart (10' apart on a beam). I had a bad feeling about it at the time and just didn't do my research.
I currently have two parallel beams spanning 25' (20' cabin, 5' deck). I have 4 12'' sonotubes (0', 10', 20' and 25'). I would like to add piers at 5' and 15'.
I am thinking of using pre-poured blocks, because pouring additional columns would really set back my build due to cure time and hassle. I have drafted some plans for this.
Forum friends:
- Do you think the proposed foundation is decent for a 20x12 shed roof cabin?
- Would you propose any changes to what I have detailed, or suggest a different approach to fixing my mistake?
Thanks in advance!
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Bruces
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# Posted: 20 Jun 2020 18:26
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What size are your “two parallel beams “ ? Floor joist size ? If your beams are big enough you might be in good shape as is .Sorry ,I am at camp and can’t open the drawing
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willywilly2020
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# Posted: 20 Jun 2020 20:27
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Quoting: Bruces What size are your “two parallel beams “ ? Floor joist size ? If your beams are big enough you might be in good shape as is .Sorry ,I am at camp and can’t open the drawing
No problem, and thanks!
Beams are 6x12, and joists are 2x12 w/16'' spacing.
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Brettny
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# Posted: 21 Jun 2020 07:31
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10ft is a bit far. The time to redo this is now prior to any wood being on.
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FishHog
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# Posted: 21 Jun 2020 09:13
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I agree with Brettny, do it right now. I know you want to get moving on your project, but stuff like the foundation isn't the thing to rush on or compromize with something that isn't quite right.
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Just
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# Posted: 21 Jun 2020 09:36
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Just scab on a extra 2x12 x20 ... or two if she is nervous it’s a cabin.. Make sure you have lots of x bracing on the piers.
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willywilly2020
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# Posted: 21 Jun 2020 09:38
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Thank you all! I am going to change it to make it sturdier. Do you think adding additional posts with a concrete decking block at the midpoint (see original sketch) would be sufficient?
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Bruces
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# Posted: 21 Jun 2020 09:43
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3 2x12†spruce is good for 12’2 supporting 12’ joists in a single level home .You are actually fine how you are .I guess different areas might have slightly different specs .Look up beam tables for your area to be sure .
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Bruces
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# Posted: 21 Jun 2020 09:53
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I guess I should add that 4 -2x12 can support 10’6†for a two story building with 12’ floor joists .
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ICC
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# Posted: 21 Jun 2020 10:36
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So, these beams are sticking out the end marked as being a deck. Exposed to rain and therefore susceptible to rot. I believe that beams should be kept under the structure, out of the weather, and dry at all times. Or they should be pressure treated, but keeping elements that are difficult to replace if the need arises out of the weather is better in the long run. Moisture can also be wicked under along the beam. Think about it. Decks are best built as an add-on to a structure.
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Brettny
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# Posted: 21 Jun 2020 11:49
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If you went to a 5' spacing you could use a smaller beam than a 6x12. The porch area should be PT. This means you should break over a sono tube. If you use say 2x10 and laminate them you could use 10' and break back under the cabin.
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snobdds
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# Posted: 22 Jun 2020 11:05
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Just do 3 2x12 glued and lagged together for the beams. Then make your porch covered.
You will be ok.
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Brettny
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# Posted: 22 Jun 2020 16:44
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I would do PT on the deck girders even if it's covered. Your talking about a few dollars and have alreaty went down the road of doing it wrong.
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