Underground constructions also need to be resistant to the penetration of liquids and chemicals to protect and lengthen the structure’s lifespan.
Treat and prepare the surface.
Apply a primer.
ATTENTION, every substrate requires its own specific primer. A levelling layer can be applied with POLYAC® 55 in case the surface is too rough.
Put on top of this a 1st waterproofing layer (white or colourless) POLYAC® BDM. This can be the manual version POLYAC® BDM-M or the sprayed version POLYAC® BDM-HD. This layer assures the waterproofing of the system.
After one hour (depending on the ambient temperature) apply the 2nd layer of POLYAC® BDM M or POLYAC® BDM HD. This serves as protection of the waterproof membrane.
The colour of the 2nd layer should be different from the 1st layer. This is necessary to guarantee good coverage of the first layer during installation and to be able later to distinguish the protective layer from the waterproof layer during checks.

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