Weather Barrier Coatings

VINNAPAS® EP 8178 from WACKER is a vinyl acetate-ethylene (VAE) dispersion specially designed for liquid-applied, weather-resistant air barriers. Weather barrier coatings formulated with VINNAPAS® EP 8178 provide excellent water resistance, high vapor permeability, desirable mechanical properties and high extender loading capability.

Superior Performance

VINNAPAS® EP 8178 is vapor permeable in low- and high-humidity environments but remains resistant to bulk water, such as from wind-driven rain. Moreover, it provides excellent tensile strength and elongation at break, which is not diminished by immersion in water. This improves resistance to crack formation following exposure to weathering.

Easy and Safe Application

Liquid-applied barrier coatings can be easily sprayed or roller-applied to residential or commercial structures to form a continuous protective layer. VINNAPAS® EP 8178 can be used for creating high-solids, rapidly drying formulations with no additional plasticizers or coalescing agents.


  • Contributes to increased airtightness
  • Good water vapor permeability
  • Low water absorption
  • High tensile strength and elongation
  • Quick drying
  • High extender loading possible
  • Suitable for low-VOC formulations (<10 g/L)
  • APEO free