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How to Damp-Proof a Cellar

Updated February 21, 2017

The cellar is an obvious place to keep dry goods and store furniture. A cellar is meant to be dry, so when dampness is present, something is wrong. Cracks do not need to be present for dampness to come through cellar walls. Parging the cement of the walls as well as adding a moisture control compound to the walls will prevent water from seeping through the walls and ruining all your stored food and furniture.

Sift 4.54kg. bags of sand through a screen into a mortar pan, using a gloved hand to push the sand through the screen. Add sand until you have 31.8kg. of sand in the mortar pan.

Add 18.1kg. of portland cement to the mortar pan.

Pour water into the pan and begin to mix the material with a rake. You should get a liquid but firm texture.

Dampen the wall of the cellar with a hose. Lift a trowel full of parge and spread it along the wall, pushing it into small holes. Spread the parge until the whole wall is covered.

Apply a damp-proofing asphalt material (available form your hardware store) to the wall according to the instructions included on the packaging. Usually it is applied with a paint roller, allowed to dry, then reapplied.

Things You'll Need

  • Sand
  • Portland cement
  • Mortar pan
  • Hose
  • Rake
  • Trowel
  • Damp-proof compound
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