Prep work to receive the concrete slab continues. It is important to note the placing of 6" of High Density Extruded Polystryne insulation around the first three feet of perimeter of the building. Properly insulating the slab-on-grade floor not only will help save on energy bills, but also will improve the building's comfort. Cold concrete slabs can be a source of discomfort for the building's occupants. The insulated slab will reduce heat loss. This reduction in heat loss will help moderate indoor temperatures.
Slabs lose energy primarily as a result of heat conducted outward and through the perimeter of the slab. The R Value at the perimeter of this slab will be 30, preventing heat loss.
Vapor barriers are traditionally specified to minimize moisture inflow through concrete that’s in contact with water or water vapor from a high water table. Although a vapor barrier may not be necessary where no drainage or soil problems exist and in arid regions where irrigation and heavy sprinkling are not done. However, it was decided to use a vapor barrier because it is fairly inexpensive to install at the time of construction and moisture problems are always difficult to correct after construction.
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