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Small Cabin Forum / Cabin Construction / Post Foundation Repairs
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kittysmitty
Member
# Posted: 16 Sep 2018 07:48 - Edited by: kittysmitty
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I thought I would share some pictures of my cabin post foundation repairs. The cabin is about 14 years old and I noticed over time the cabin was twisting on the posts and the concrete was breaking down.
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kittysmitty
Member
# Posted: 16 Sep 2018 07:53 - Edited by: kittysmitty
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It's 20 x24 and sits on 12 posts. There was a lot of discussion and research as to the best way to repair,time/effort/cost. In the end I used concrete parking curbs to build cribs. There are not all done yet but in progress. Just thought I would share
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Borrego
Member
# Posted: 16 Sep 2018 18:25
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Well that's clever and a bit unorthodox....
Did you jack up the structure to do this?

I would want to have a better post - beam connection to prevent the cabin from sliding around in the event of earth movement.....

kittysmitty
Member
# Posted: 16 Sep 2018 19:25
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Yes, the structure was jacked up and leveled. Please expand on "earth movement"

Dekagoldwingers
Member
# Posted: 16 Sep 2018 19:58
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Earth can move due to water action. If the soil becomes very saturated, it expands then contracts with drying. Also if you are in a freezing location then water in the soil becomes ice and the soil expands greatly! It looks to me that your original posts suffered water damage perhaps due to freezing and perhaps a poor quality concrete. I was advised by a building inspector friend that if using bagged premix to add a cup or 2 of cement powder to the batch to increase the strength. I suggest that you look at your drainage to make sure water does not pool around the concrete or build up under it to bring the problem back. Good luck

Wilbour
Member
# Posted: 17 Sep 2018 00:42
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I was on 4 concrete posts that heaved and tilted sideways. Lots of clay that stays saturated well into the summer.

I now have 2ftx2ftx2inch slabs. On that I have cinderblocks. Each winter the earth moves up and down so after it dries out in the summer I jack the corner up and build up the lower parts with more crushed stone and replace the pad and block.

A big pain in the butt, but doesn't take more than a couple of hours. Keep in mind I am 10x15 and only have 4 contact points to level out.

Hate it but with so much clay and moisture there is little I can do. I can trench all I want but the clay just holds the moisture until it dries out.

Dekagoldwingers
Member
# Posted: 17 Sep 2018 11:35
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The solution usually is to dig down below the frost line in your area and build a footing approx 2’ square to support your posts. In my area the frost line is 4’ down. The footing should contain rebar which connects to the post coming up from it. The cardboard forms work well for the posts. See my note about adding cement powder to premix. Then it would help you to backfill around the post with drain rock or whatever material you can find that will allow drainage away from the post. It would also be beneficial to connect drain tile or a French drain to each post hole to drain away excess water. I will attach a picture of a commercially available footing form which will work. You can also find “mobile home pads” which are designed to support these loads and connect to posts. If you are constructed on well drained gravel then the footing is not so important.

Dekagoldwingers
Member
# Posted: 17 Sep 2018 11:47
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This is a post footing form. It is designed to have a cardboard form placed on top. You should have reinforcing steel bent into “L’s” inside and projecting up into the form tube. The unit is about 30” wide and tall.
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2199D483C7354BDEA.jpeg


Dekagoldwingers
Member
# Posted: 17 Sep 2018 11:53
Reply 


Sorry the picture shows inverted. Look for Bigfoot Systems online.

kittysmitty
Member
# Posted: 3 Oct 2018 16:01
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Yes, I'm aware of Bigfoot Systems, but somewhat late for those now. Next to impossible to dig in the center of the building. This was a "repair" not new construction.

North1966
Member
# Posted: 10 Oct 2018 21:06
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Hello, I am new to the site but I have just finished the foundation and floor hoist. Please any feed back would be greatly appreciated as I have never done anything like this.

North1966
Member
# Posted: 10 Oct 2018 21:21
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Here are the pics.
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20180929_145613_Film.jpg


North1966
Member
# Posted: 10 Oct 2018 22:29 - Edited by: North1966
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Last one.
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20180929_150003_Film.jpg


North1966
Member
# Posted: 10 Oct 2018 22:41
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The cabin is 16 x 24, I have 9 blocks with a 12' span and I am using 2x10 for joust.

Wilbour
Member
# Posted: 10 Oct 2018 23:20
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Because I am getting too old to rotate my head
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North1966
Member
# Posted: 10 Oct 2018 23:31
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Thank you

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