Indicator Mesh is a highly visible plastic mesh used on bridge decks to indicate and protect the waterproof membrane. The indicator mesh is laid over a layer of sand asphalt or a fine binder course which has been laid over the waterproof membrane on the bridge deck.  A binder course is laid above the indicator mesh, before the bridge surface course is laid.

Indicator mesh is a great alternative to other depth indicator techniques such as red sand asphalt.  The indicator mesh ensures that future resurfacing contractors undertaking subsequent planing or repairs to the bridge surface and binder course are given clear warning that the waterproof membrane is below.