In all our literature and documentation, Concrete Slab Thickness is measured from the top of the Heat-Sheet nodules to the top of the slab itself. We present Concrete Slab Thickness in this way to be as conservative as possible.
The One Minute Estimator on Heat-Sheet.com will generate an estimate for Total Concrete Volume required for your project and this estimate is dependent upon the Concrete Slab Thickness that you enter as an input.
The Total Concrete Volume estimate that is generated by our One Minute Estimator will include the concrete that is between the Heat-Sheet nodules.
This is again to be as conservative as possible and to ensure you do not order less concrete than you will actually require.