WATERPROOFING & COMMON PROBLEMS

May 27, 2014

The following Waterproofing DIY Guide offers step-by-step instructions for waterproofing external plastered surfaces, exterior walls and face brick walls.

Waterproofing External Plastered Surfaces

Problem: Water-affected external plastered surfaces such as parapets, walls, pillars etc.

Solution:

  • Ensure that all surfaces are clean, firm and thoroughly dry before painting
  • Repair and fill any cracks
  • Prime with Plascon Plaster Primer
  • Apply Plascon Multiseal by brush or roller and build up to a thickness of 1mm in 3 coats, allowing 4 hours drying time between coats
  • Finish with top coat of your choice

Plascon-Multiseal

Waterproofing Exterior Walls

Problem: Rising and penetrating damp (occurs to 1.1m above ground level)

Solution:

  • Remove any paint completely until you are back to a cement / plastered surface
  • Wash with Polycell Sugar Soap, rinse and allow to dry
  • Remove and repair poor plaster with Polyfilla Masonry Patching Plaster
  • Apply 3 coats of Plascon Dampseal, allowing 24 hours drying time between coats
  • Thin the first coat 30% with mineral turpentine
  • Finish with top coat of your choice

Plascon-Dampseal

Waterproofing Face Bricks

Problem: Moisture ingressed through face bricks

Solution:

  • Remove any cracked or friable cement between bricks
  • Repair with Polyfilla Masonry Patching Plaster
  • Wash with Polycell Sugar Soap, rinse and allow to dry
  • Apply 3 coats of Plascon Brickseal, allowing 4 hours drying time between each coat

Plascon-Brickseal

IMPORTANT NOTICE: More detailed information as well as the full data sheets for each of the Plascon products mentioned and linked to above are available for free download from the Plascon website. Simply follow the link(s) and click on “Download Data Sheet” in order to access these. 

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