Cover board with honeycomb layer

A method, comprising:

• attaching an insulation layer comprising polyisocyanurate to a deck of a roof structure;
• positioning a cover board over the insulation layer, the cover board comprising:
• a first face sheet;
• a honeycomb layer positioned adjacent to the first face sheet, the honeycomb layer comprising a honeycomb structure having a plurality of partition walls forming a plurality of cells;
• and
• a second face sheet positioned such that the honeycomb layer is between the first face sheet and the second face sheet;
• and
• attaching a water shedding layer to an upper surface of the cover board,
• wherein the roof structure exceeds requirements for Very Severe Hail Resistance according to FM Approvals FM 4470 VSH impact resistance testing standard for Single-Ply, Polymer-Modified Bitumen Sheet, Built-Up Roof (BUR), and Liquid Applied Roof Assemblies.

A roofing system, comprising:

• a deck,
• an insulation material positioned over the deck;
• and
• a cover board positioned over the insulation material, the cover board configured to provide very severe hail resistance and comprising:
• a first face sheet,
• a honeycomb layer positioned adjacent to the first face sheet, the honeycomb layer comprising a honeycomb structure having a plurality of partition walls forming a plurality of cells, and
• a second face sheet positioned such that the honeycomb layer is between the first face sheet and the second face sheet,
• wherein the roofing system exceeds requirements for Very Severe Hail Resistance according to FM Approvals FM 4470 VSH impact resistance testing standard for Single-Ply, Polymer-Modified Bitumen Sheet, Built-Up Roof (BUR), and Liquid Applied Roof Assemblies.