The present invention provides an inverted roofing system and method that is more thermally efficient, inexpensive and quicker to install, better able to withstand environmental conditions, and produces the appearance and some functional benefits of a traditional natural green roof ballast top-layer. It does not require a sloped roof gradient, and is capable of a user controlled mass per square foot roof load. The inverted roofing system and method provides a ballast top-layer that is lightweight, and maintains properties that will prevent wind uplift.

An inverted roof membrane assembly (IRMA) includes decking, a waterproofing membrane above the decking, a layer of polymer foam insulation board above the waterproofing membrane, and ballast above the polymer foam insulation board layer. The polymer foam insulation board includes a polymer foam layer that includes an alkenyl aromatic polymer and an infrared radiation attenuator, and first and second facer layers.

Embodiments of the invention provide roofing boards and roofing systems having improved fire resistance properties and methods related to the same. According to one aspect, a roofing system is provided. The roofing system includes roofing panels positioned atop structural support members to form a roof deck. Roofing boards are positioned atop the roof deck and coupled thereto and a roofing membrane is positioned atop the roofing boards and coupled therewith. The roofing boards include a coating of a mineral based material applied to one or more surfaces in an amount between the range of about 0.10 lbs/ft.sup.2 and about 0.70 lbs/ft.sup.2. The mineral based material coating enables the roofing boards to pass the UL 790 class A tests, such as the burning brand test.

A protected membrane roof system for installation on a roof decking comprising an upper insulation board having an upwardly-facing upper board top surface and an opposite downwardly-facing upper board bottom surface and at least one through-hole communicating therebetween, a ballast material positioned over the upper insulation board, and at least one fastener assembly having a base seated substantially adjacent the upper board bottom surface, a rod extending substantially vertically from the base of sufficient size so as to extend through the through-hole of the upper insulation board and the ballast material, and a cap engaged with the rod above the ballast material, whereby the wind uplift resistance of the protected membrane roof system is improved and scour of the ballast material is reduced by effectively anchoring the ballast material to the upper insulation board beneath the ballast material.

The present invention provides an inverted roofing system and method that is more thermally efficient, inexpensive and quicker to install, better able to withstand environmental conditions, and produces the appearance and some functional benefits of a traditional natural green roof ballast top-layer. It does not require a sloped roof gradient, and is capable of a user controlled mass per square foot roof load. The inverted roofing system and method provides a ballast top-layer that is lightweight, and maintains properties that will prevent wind uplift.

Embodiments of the invention provide roofing boards and roofing systems having improved fire resistance properties and methods related to the same. According to one aspect, a roofing system is provided. The roofing system includes roofing panels positioned atop structural support members to form a roof deck. Roofing boards are positioned atop the roof deck and coupled thereto and a roofing membrane is positioned atop the roofing boards and coupled therewith. The roofing boards include a coating of a mineral based material applied to one or more surfaces in an amount between the range of about 0.10 lbs/ft.sup.2 and about 0.70 lbs/ft.sup.2. The mineral based material coating enables the roofing boards to pass the UL 790 class A tests, such as the burning brand test.

A protected membrane roof system for installation on a roof decking comprising an upper insulation board having an upwardly-facing upper board top surface and an opposite downwardly-facing upper board bottom surface and at least one through-hole communicating therebetween, a ballast material positioned over the upper insulation board, a netting positioned over the ballast material, and at least one fastener assembly having a base seated substantially adjacent the upper board bottom surface, a rod extending substantially vertically from the base of sufficient size so as to extend through the through-hole of the upper insulation board, the ballast material, and the netting, and a cap engaged with the rod above the netting, whereby the wind uplift resistance of the protected membrane roof system is improved and scour of the ballast material is reduced by effectively anchoring the netting to the upper insulation board beneath the ballast material.

Some embodiments of the present technology may encompass pour in place roofing insulation systems. The insulation systems may include an upper roof surface material that is configured to be vertically spaced apart from the top surface of the roofing structure. The insulation systems may include a plurality of expansion limiters that are configured to extend between the roofing structure and the upper roof surface material. The insulation systems may include a polyiso foam insulation material that is configured to be disposed between and filling at least substantially all vertical space between the roofing structure and the upper roof surface material.