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concrete floor in barn
Site prep is everthing. What are you building on for a base? 3500 lb min. Don't let them add water at the site,give them several locations to pour from not exceeding the chute length by more than 10-12'.
I would not build on anything less than 18-24" of clean compacted gravel above the surrounding grade. 2-6" inches
of stone? Min. of 6" after compacted. 2" of foam and rebar only. The wire won't keep it moving. Only breaking up, if
you pour it inside of a 4' frost wall it can't go anywhere.IMHO insulated floor and frost wall is the ONLY way you will keep an unheated build in place.
If you putting in a lift I think you will need a substantial concrete base before the floor goes in. The lift
company should be able to give you the specs. Do your home work first it is not a easy fix later. I am going to e-mail you some pics of a 28x36 three car garage
foundation that I just poured. We are about to backfill and fill in the floor area with clean sharp sand. compacted every foot. 2" inches of foam 5" of 3500
lb. mix in the floor with rebar every 4' criss cross pattern. The walls are a min 4' below grade with 8" exposed when final grade is done. 3' apron with 2" of foam and rebar across the front in front of the doors.
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concrete floor in barn
Not sure about the rat wall term,perhaps a 4' frost wall?
Kinda late for that. Sounds like a decent footing under your posts, have they moved? I would go with the 1" foam
and lots of rebar(it's cheap)with 5" of 3500 lb min. I have used the 1" here in maine without a problem. We generally have a 4' frost or more. I have gone to two inch for insurance and no call backs. You might consider a two foot wide strip of foam around the exterior laying flat, butted up to the building. covered with stone
12-18 " of frost is more than enough to heave a floor.
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concrete floor in barn
Beagle
You said insulating an unheated slab isn't needed? Don't you
think that it would keep the frost from penetrating the soil under the slab?
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concrete floor in barn
Beagle
I would agree with that on a perfect site prep. but most
are not done under an engineers eye.
Just for fun take a piece of 2" foam 4'x4' and lay it on the ground before freeze up. Lift it up in the middle of the winter and try a spade. I will bet you that you can dig down . I have built many Lakefront decks in places you can't
prepare the site properly(enviromental rules) can't disturb the soil near lake. We always lay foam down under our pads
that the posts will sit on.Seems to work? We use a high density foam board made
for ground contact.
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concrete floor in barn
We can all learn something from anyone, My understanding on the matter is that the foam will maintain the grounds natural temp. and not allow the frost to penetrate. If you look at my pics of my house, my shed roof off of the garage
is on 18" x6" round concrete pads with 2" of foam under them.
Seems to stay alright with Maine temps?
I think that if you can keep the water away from them it helps.
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concrete floor in barn
Beagle-Denwood
Here is a web page on foundation insulation you might find interesting.
They also cover many other subjects when it comes to building.
Link:
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concrete floor in barn
Good point! I'm not sure if that web page discusses unheated building science, but I am going to look.
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concrete floor in barn
Frank
I'm curious,do you keep the building constantly heated ?
I don't believe the foam will compress any more than it
did after you poured the floor.
grinder
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