Need lightweight insulated concrete roof designed for a 40'x100' ICF building with no interior support walls.

I am in need of a lightweight insulated concrete roof design for my 40'x100' ICF building. The project requires no interior support walls. The ideal candidate should have experience with designing lightweight insulated concrete roofs. The following details should be considered:

- Insulation material preferred: Foam
- Maximum weight the roof should support: Not specified
- Desired R-value for the insulation: Not specified

The project requires a professional who can provide recommendations for the best materials and design to ensure a durable, energy-efficient, and cost-effective roof.