Return to the Basements Forum | Post a Follow-Up

White Powder on Basement Block Wall

Posted by lorislines (My Page) on
Wed, Aug 23, 06 at 8:30

We moved into our new home that we had built in March of this year. We started noticing a dampness on the block walls in a few areas of the basement. Over the course of time, however this dampness turned into furry white patches on the wall. When touched, it turns into a fine white powder. I've done some searching and found an image of it on the web. Unfortunately, all it really says is it's a loss of lime salt on the cement block walls. Has anyone heard of this before and if so, whats our next step in correcting the problem. Thanks

Follow-Up Postings:

RE: White Powder on Basement Block Wall

Scoll down to the Masonry part. It is from water seeping through the cinder blocks and then drying/evaporating, leaving behind these white powdering substances which is natural salts in the water. You do need to remove it before painting/waterproofing etc.

If you go down to your local hardware store, they will carry various products to deal with this or you buy Muriatic acid itself and dilute it as per instructions. Drylok is one namebrand and is carried by Lowes. And of course, there are others..


RE: White Powder on Basement Block Wall


jayh is absolutely right in his response. But...I would be concerned about the water/moisture seeping through the cinder block. Waterproofing should be on the outside and done before backfilling so that you don't get any seepage. You can get products to seal the inside but they are not usually that good. You really have to stop the moisture on the outside. Get in contact with your builder and quiz him about it. You must have some kind of home warranty. What do you think jay?

RE: White Powder on Basement Block Wall

Thank's so much to both of you. I do know that a black waterproofing material was applied on the outside blocks. It is surprising though that moisture is seeping through. I think you're right in that we need to talk to the Mason's who completed the job. Again, I appreciate the help.

RE: White Powder on Basement Block Wall

ahh, went back and reread the original post. Didn't see that it is a new home. Most certainly get back to the contractor/masons and talk to them about it. Maybe take a photo of it for proof (you never know these days).


RE: White Powder on Basement Block Wall

It isn't the masons fault. He did his job. There is a material that one can put around a new build foundation that actually wraps the walls to prevent moisture seepage. I have seen it, Unfortunately I don't know what name it goes by

RE: White Powder on Basement Block Wall

It's called bubble wrap, for new builds

 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!

Return to the Basements Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.

Learn more about in-text links on this page here