How do I waterproof my basement?

Sharon Boorum
by Sharon Boorum

How to waterproof a basement. I have cinder blocks and no matter how many times I seal them I still see mold. Yes I have a humidifier.please help

  5 answers
  • Mogie Mogie on Nov 23, 2018

    The grade next to the house should slope down and away from the building by least 6 in. for the first 10 ft. Consider installing gutters, or make sure the existing gutters are working properly. And check that your irrigation system isn’t adding to the problem by spraying water right up against the side of the house.


    A basement drainage system is key to keeping water out of the basement. There are several types of systems, including a floor drain, French drain and sump pump.

  • Kelli L. Milligan Kelli L. Milligan on Nov 23, 2018

    They need to be sealed on the outside.

    It may be time to call a waterproofing co. Sorry

  • William William on Nov 24, 2018

    If your not getting any water. Wash them down with about a cup of bleach to one gallon water. Then wash down with one cup of vinegar to one gallon water. Bleach cleans the mold off and vinegar kills any mold spores. When dry paint with Drylock Waterproofing paint.

    • Sharon Boorum Sharon Boorum on Nov 25, 2018

      Thought you should never mix bleach with vinegar? Do I need to wait a few days after using one or the other?

  • Debbie Kuhar Debbie Kuhar on Nov 24, 2018

    The drylock worked for me, but quite a few coats over the years. Also, using this product, you need to ventilate. The smell, so keep a window opened. Plus my mother in law suggested to be, put bushes outside and plant. Their roots hold in the water. It worked

  • William William on Nov 25, 2018

    It is fine to use bleach and vinegar separately for cleaning as long as the surface is rinsed between products. Bleach and vinegar are effective cleaning agents when used separately. Although bleach is a strong disinfectant, and vinegar dissolves mineral deposits and kills many types of mold, fungi and bacteria, combining the two can be dangerous. Mixing bleach with an acid such as vinegar creates chlorine gas, a toxic chemical that can be deadly at high levels. Wait a day or two between using the two.