Pole Barn on Slope (New Idea?)

[Reino]

Pole Barn on Slope (New Idea or Dumb Idea?)

Hello,

I now this has been a topic several times but I have an idea that I haven't seen before and wanted your thoughts. If there is another page with same topic I apologize and please send the link.

Anyways, Im looking at building a 30'x40' pole barn/garage on my property. I have a steady slope throughout. The slope will run downhill from the back of the building to the front where there will be 2 garage doors. Another door will be on the left side towards the back on a 40' side.
What Im thinking about doing is cutting out to make a level pad which will leave me about 18" deeper into grade on the back than the front. Id then run band boards around the outer edge of the poles as usual but run them up to about 8" above grade. Id also run board on the inside at the same elevation. What Id like to do is then fill the area between the inner and outer band boards with concrete when pouring the floor after installing some rebar.
What Im thinking this will do is allow me to pour the slab below grade (at least in the back of building) and help keep water out at the same time. I know Ill have gaps between the concrete and poles but I was thinking I could also add some roll on waterproofing around the outside. Id obviously try to divert the water away from the back also. I know its sort of a retaining wall but after stone and concrete for the slab Id only be looking at about a 12" wall above the slab, if that.

Id basically have the usual concrete lip you'd have in a poured foundation building except Id have wood poles every 8' or so since its a pole building.

I made a quick sketch but cant figure out how to add it.

One of the other advantages of this is I could dig, lay stone, let is settle and build the building while deferring the cost of concrete until I can save up a few extra pennies.

Anyways, thoughts, suggestions and criticism are all welcome.

 

[signcrafter]

I'm thinking you will have a lot of problems. Concrete and wood expand and contract at very different rates so you would probably need expansion joints between the concrete and wood posts every 8'. Seems like lots of opportunity for cracking and water leakage.

 

[Reino]

Don't most pole barns done with a "floating slab" have expansion joints between the slap and poles? Id just continue the expansion joint board up the concrete ledges?

Here is another point, I guess. When you build a pole barn you usually have your wood 2x8 or so band boards. Doing it the way I described I could remove the band boards and just leave the concrete ledges. This would allow the slab to be truly floating. With the boards attached, are they not subject to heaving in the frost and pushing the whole building up?

Who knows, this may be a dumb idea.

 

[buddyboy]

google search "wood basement walls"

 

[Reino]

Re: Pole Barn on Slope (New Idea or Bad Idea?)

Thanks, I saw that in a book awhile back. Never seen anyone do that in this area. Though the wood walls would be much cheaper Id much rather use concrete if possible, it would make me sleep better at night.

Anyone else?