KHIA headerKnow-How in Action


Keeping The Rain Out With Belzona® Expansion Joints



Buildings & Structures (BSTR)



Floor Problem Areas (FPA)


Customer Location:

Local Authority, St.Helens, UK


Application Date:

June 2004


Application Situation:

Vertical and horizontal expansion joints in asphalt floor and brick walls of shelterd housing complex.



Leaking expansion joints



Belzona® 4521 (Magma-Flex Fluid)

Belzona® 2211 (MP Hi-Build)

Belzona® 4111 (Magma-Quartz)



Asphalt and brick


Application Method:

The application was carried out in accordance with Belzona Know-How System Leaflets FPA-5 & FPA-6.


Belzona Facts:

The old expansion joints were not flexible enough and were allowing rainwater to seep through into the neighboring dwellings causing damp problems. The joints were removed and filled using Belzona® 4521 for the horizontal joints and Belzona® 2211 for the vertical. A layer of Belzona® 2211 was also applied over the horizontal joints to improve the aesthetics of the repair.


Photographs Description

  1. Old joint being scraped out 
  2. Joints masked off ready for re-filling 
  3. The completed repair 
  4. An external 7-meter vertical expansion joint
Case study pic one


 Case study pic two


 Case study pic three


 Case study pic four


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