Insulation required for frost protected shallow foundation 3

[struct6]

Hi Folks,

I am designing a foundation for a unheated storage unit. I am planning to use a slab on grade system with thickened edge. My question is

1. should we provide a continuous insulation layer under the entire slab or should we insulate only at the edge of the wall and extende it out a few feet? The document i am referring to design the insulation calls out for a continuous layer of insulation beneath the slab. However, I have not seen that in regular building practice. Have any of you provided continous insulation beneath the entire slab?

2. Is there any web site which has information on specifying the insulation ?

I have attached the document which I used to design the insulation for your reference.

Thanks all

 

[ToadJones]

Mike:
I agree 100%

 

[mn321]

perhaps these links might be helpful :

Turn-down slab foundations are commonly used in Scandinavian countries .

http://www.countryplans.com/Downloads/shallowfound.pdf

http://building.dow.com/na/en/applications/building/foundations/foundationshallow.htm

http://www.cs.arizona.edu/people/jcropper/desguide.html

Every one of them spacifies vertical, and outer horizontal wing insulation. As long as you have an adequate amount of compacted structural backfill, you should be fine.