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Dispersion for Walls and Floors

Surface sealing: bituminous acrylate sealants and bituminous thick coatings for sealing surfaces in building structures

Special reactive bituminous acrylate sealants are used for sealing surfaces in building structures. They are suitable for undergrade building structures as well as for freely accessible building structures. Structural elements with ground contact, however, must be laid bare before bitumen coatings for surface sealing can be applied. Bituminous coatings withstand high water loads and are especially suited for use in monument conservation.  

Polymer modified bituminous thick coatings (PMB) are used for (classic) vertical sealants in building structures. Reinforcement fabric is used as reinforcing material in the area of joints and for bridging cracks.

 

Our products for surface sealing

Bituminous Acrylate Dispersion: 

  • WEBAC® 5611 

Bituminous Thick Coatings (PMB): 

  • WEBAC® 5621P (1C)
  • WEBAC® 5622P/F (2C)
  • WEBAC® 5620 (undercoat) 

 

Surface Sealing: Preparatory Work  

Structural analysis before use: 

  • Nature and condition of the substrate
  • Structural conditions (temperature and air humidity)
  • Water load classes
  • Existing surface interruptions due to fitted components (e.g. pipe passageways)


This provides information on: 

  • Selection of suitable product
  • Pretreatment of substrates


Substrates must be free of loose and separative substances. Slightly absorptive substrates should be roughened using a suitable method. Open joints, concave moldings and rounded edges in corners must be closed with mortar or floated to obtain a closed, smooth surface. Old, firmly adhering bitumen coatings can be reworked after cleaning. 

A scratch coat must be applied to concrete substrates before applying the bituminous thick coating for actually sealing the surface. The coating material itself can be used as scratch coat.

 

Application 

Bituminous Acrylate Dispersion 

It is recommended to apply a thin priming coat of WEBAC® 5611 without cement before mixing WEBAC® 5611 with the cement and applying it to the substrate. The bitumen coating can be applied by roller or wide paint brush; spraying is also possible. Reinforcing fabric can be used to reinforce corners and to bridge expansion joints.

 

Polymer Modified Bituminous Thick Coating 

Undercoat
Substrates must be primed with the undercoat WEBAC® 5620 before applying WEBAC bituminous thick coatings.

Bituminous thick coatings are applied at the required layer thickness by smoothing trowel or flat trowel in at least two operations. Air humidity and sunlight influence the curing speed of the bitumen coating. Only pure WEBAC products without any residues from cleaning agents or other impurities may be injected.

 

Cleaning during and after the surface sealing process

  • Clean the equipment thoroughly with water any time work is interrupted for longer periods of time and after completing the surface sealing process
  • Remove cured residues from tools with WEBAC® Cleaner B