Does anybody have design experience with how to deal with shallow bedrock preventing bury depth beneath the frost line? I have a friend (no really) that is designing a job with a 125' runout to boreholes and only 2' available bury depth. I was told that the project can't afford the rock removal and they are desperate to find a solution. They asked me if using a low K fill would act as an insulator (Gilsulate, K=0.80) . I'm at a loss if there is a solution for this. The building code bury depth for foundations is 48". Is there any merit to using insulation? Or, I know that some use geo for snow melt. I haven't yet, but, has anyone used it as heat trace to prevent shallow piping from being affected by frost? Thanks!