Roofing systems installed beneath surfacing materials that are designed for walkable roof applications have special roof membrane protection requirements.

The roof membrane protection layer must physically protect the roof membrane from the surfacing materials installed over it, but must not interfere with positive drainage at the membrane level. The protection layer must have exceptional resistance to crushing failure, prevent direct transfer of concentrated point loads and impact loads to the roof membrane, and at the same time provide long-term physical and chemical compatibility with the roof membrane.

All Ruberoid^® PlazaDeck Roofing assemblies utilize one of two roof membrane protection materials that satisfy these criteria:
¨ Reprocessed rubber pads, min. 3/16" thick (installed under concrete paver pedestals and wood support blocking with concentrated point-loading).
¨ PVC heavy-duty drain board with knit geotextile filter fabric, min. 1/2" thick (installed under mortar-set surfacings and other uniform loading applications).