Today’s DIY Question

How to seal basement floors for tiling

by | DIY Questions

Karen asked

My husband and I bought a house. The house has a basement concrete and we want finish it ourselves. The only thing that worries us is that it is very wet and the floor sweating. The home inspector said he recommended to ventilation duct of air conditioning and we did but still moist. We also bought a dehumidifier which was recommended and is beginning to dry the floor very slowly. We buy porcelain tile to put on the floor, but first we want to be sure to control the humidity, we do not damage the work. What advice can we give? We have two children and do not want to affect, besides our budget is somewhat limited. My dad and my husband will do everything but need to know to buy the right to finish the basement. Help us !!

DIY Answer Guy

Hi Karen and Hector, I get a lot of questions regarding basement floors and here is the solution. 

First off the floor will need to be cleaned thoroughly. Then you can apply and underlayment.

Ditra or Dural Durabase CI. Both of these products are perfect for your basement conditions. They are a little spendy, but will protect your tile and investment for years to come.

Be sure to watch the video on how to apply the product and follow directions and you will achieve a great result.

Let me know how thing go.


Thanks Larry for sending us option to protect our investment. They look great but are very expensive for our budget. So now we think about and see what we can do.

Hector and Karen

DIY Answer Guy

You’re welcome. Here’s a great product to use on your basement walls. Drylok masonry waterproofer. Many DIY’ers have used this with good success.