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geobuild
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# Posted: 21 Feb 2021 02:41pm
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I’m thinking about buying a 12’ x 20’ prefab shed to be used as a bunkhouse. I would like to place it on a raised pier foundation with a gravel base. Typically, delivery is by truck and placed on a gravel foundation. I would like to place the shed on piers with 2†x 10†joists running perpendicular to the shed skids. There are (5) 4†x 4†skids running the 20’ length of the shed. I need suggestions of a reasonable way to jack up the shed and once in place, build the foundation. I’m thinking about (5) piers on each side.
Suggestions appreciated.
Thanks.....
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gcrank1
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# Posted: 21 Feb 2021 02:46pm - Edited by: gcrank1
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Question 1: will this be a 'legal' and permitted (if required) and/or require approvals and inspections structure? Ie, there are a number of code (read-safety) issues regarding the build, several of which have been the subject(s) of very recent threads.
Q 2: Have you looked at those?
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geobuild
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# Posted: 21 Feb 2021 03:25pm
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gcrank1, yes, it will be a legal structure. No problems there. I have a permit.
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gcrank1
Member
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# Posted: 21 Feb 2021 04:49pm
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Then I think you are going to have to go by the code in your jurisdiction as the primary ref. Check that to see if they give you options and float em by here 
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mj1angier
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# Posted: 21 Feb 2021 07:32pm
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So it depends on how it's delivered. Our shed/ cabin came on two different systems- one was a high tech guided lift called a mule that they used a remote system to drive it around. Another one cam on a trailer that would move both forward/ back and left/ right on it own.
This is a mule set up (not mine)- https://www.horizonstructures.com/mule-delivery
So they can move them into tight spots and also lift them up to about 3 ft
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Brettny
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# Posted: 21 Feb 2021 09:37pm
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Can you have them build it on 6x6 skids? 4x4 that are 20ft long can be like a wet noodle.
A single 2x10 can be tippy on end so you may need two or more. And at that point how much more would it cost to just run the 2x10s right next to the skids?
Also what size are the floor joists? Ours are 2x6s and prety darn bouncy in a 10' wide building, skids in about 12in from each side.
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geobuild
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# Posted: 23 Feb 2021 09:36pm - Edited by: geobuild
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mj1angier: I looked at the link..... cool equipment. I'll see if the shed company has a mule. TY.
Brettny: Good point about the 6 x 6s. I'll see what options they have. I can't visualize what you're saying:
A single 2x10 can be tippy on end so you may need two or more. And at that point how much more would it cost to just run the 2x10s right next to the skids?
Can you elaborate? Thx.
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geobuild
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# Posted: 27 Jul 2021 04:04pm
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Brettny
Quoting: Brettny A single 2x10 can be tippy on end so you may need two or more. And at that point how much more would it cost to just run the 2x10s right next to the skids?
I was just reading my prior posts and now I understand what you meant! I did do as you suggest, I put (2) 2x8s on either side of the outside 4x4 skids that came on the pre-fab cabin. The floor joists are 2x6s on 12inch centers and is solid.
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Steve_S
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# Posted: 28 Jul 2021 12:06pm
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Attached photo's are for my Toolshed Base 16'x8' with 6x6 PT on 18"x18:x3" "Cottage Blocks". Gravel used for this was roughly 12 Metric Tons of Grade-A Fine Crush which is very packable with a compactor.
gravel base packed GeoCloth under.
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Blocks, placed, Links Filled & Packed.
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6x6 ready for EndCut treament prior to final.
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