A watertight skirt is an important part in the build-up of trafficable parts of the bridge deck. The membrane will mainly consist of a synthetic resin, and will protect the surface against ingress from liquids, water and chemical residues like oil, de-icing salt, etc.
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.
Apply after 1 hour (depending on the ambient temperature) a 2nd layer POLYAC® BDM-M or POLYAC® BDM-HD. The 2nd layer functions as a protection for the 1st waterproofing layer. This layer will be lightly broadcasted right after application, this to improve the adhesion of the next phase, for example a bituminous primer for mastic asphalt.
The colour of the 2nd layer should always be different to that of the 1st layer. This is necessary to guarantee complete coverage of the 1st layer during installation. This will also give you the ability to check over time that the wear-course layer has not worn off or to determine that the waterproofing layer is still intact and has not been mechanically damaged.


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