Patent ID: 8863442

Claim:
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 the ballast material selected from the group consisting of soil, stone and pavers; a netting positioned over the ballast material; at least one fastener assembly comprising: a base seated substantially adjacent the upper insulation 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; and a waterproof membrane positioned over the roof decking beneath the upper insulation board, the at least one fastener assembly neither penetrating nor attaching to the membrane; 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 beneath the upper insulation board positioned beneath the ballast material without compromising the waterproof membrane.