Slab on top of slab: Building science?
I have an existing foundation which is a trench poured monolithic pour, slab on grade with the perimeter foundation walls extending 40 inches to the frost line. It has perimeter stem walls extending 24 inches above the floor slab. The room is unheated, 400 square feet, used 9 months of the year. It has 9 foot walls and vaulted ceilings.
Architectural plans for the room call for the floor to be elevated 14 inches from the existing. The monolithic pour is uninsulated and has no poly in place under it.
My options seem to be compact fill and pour a 5-inch slab or pour the entire 14 inches in place. Although the plan calls out that the room remains unheated, I want to provide an option to insulate the floor. What would be my options for a moisture barrier, insulation and concrete? And where should the components be placed? And insects are a concern also.
Home is located 50 miles outside of New York City.
Posted Tue, 04/29/2014 - 18:04
Edited Wed, 04/30/2014 - 05:25
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