The WarmFörm system consists of pre-finished insulating slab forms resting on a frost resistant stone bed.  Four profiles are available with increasing thickness of the exterior face insulation. The different face thicknesses are intended to coordinate with varying configurations of highly insulated wall assemblies. Click on this image to open up typical details of each of the WarmFörm profiles.

The system depth as referenced in the building code is the sum of the depth of the stone bed and the backfill of earth against the WarmFörm insulated forms. The minimum stone bed for WarmFörm is 8" and the minimum backfill depth is 8", so the total minimum system depth for a WarmFörm installation is 16". This is key and it is often misunderstood that the frost resistant stone bed is considered part of the overall system depth. This is stated directly in the ASCE 32 section 4.2 and is often overlooked by Code Officials because the ASCE 32 is incorporated into the IRC and IBC by reference and contains much more detailed information on Frost Protected Shallow Foundations than the IRC and IBC code books. The stone bed must meet the ASTM spec for frost resistant fill. This is a common spec as it is used widely for road and rail construction.