Patent ID: 11946257
Assignee: nan
Field: Civil engineering (Other fields)
Classification: CPC E  Y | IPC E

Claim 15:
16. An apparatus comprising:
a roof substrate having a slope and a lateral extent;
a first membrane layer that adheres to the roof substrate upon solidification after application to the roof substrate in a liquid state, wherein the first membrane layer comprises a proximal surface that adheres to the roof substrate over the lateral extent of the roof substrate, wherein the first membrane layer has a thickness that is generally uniform over the lateral extent of the roof substrate, wherein the first membrane layer comprises polyurea, and wherein the first membrane layer includes a plurality of cavity regions that are devoid of polyurea within an interior of the first membrane layer; and
a second membrane layer comprising a plural component polymer applied as a liquid to the first membrane layer, wherein the second membrane layer adheres, upon solidification of the plural component polymer, to the distal surface of the first membrane layer.