Dealing with plaster that is crumbling at the touch

Do you think that water-proofing paint would work? It is supposed to penetrate the voids in cement blocks to seal them against water penetration. It might work to bind what’s on the wall so it stops crumbling away. I am not sure what it might be called in Sweden, but here in the U.S. it goes by the name “Drylock”. Here’s a link to the manufacturer….
http://www.ugl.com/drylokMasonry/masonryWaterproofer/latex.php

In my humble opinion, you would want to stabilize what’s up there, or perhaps remove it before you frame the walls in.

Good luck!
Please post your solution!

-- No, finishing touches are what you do at the END of the project!

I had a house with similar issues in the basement. I did a lot of homework and cleaned off the wall, but I ended up selling the house to a developer who wanted to build a shopping center before I put anything over the wall.

I agree about removing all the plaster. I ended up knocking most of my plaster loose with just a broom, then a wire brush for some stubborn bits, then a hammer for the last few bits.

I have been told that it’s a flat out impossibility to “seal” the walls against moisture seeping in. Sealants help, but you can’t really stop it – the key is to keep the water away from the basement walls to begin with.

- Wait for a big rain storm and then go around outside, looking at how the water flows.
- Figure out how to keep the water flowing away from the walls instead of seeping into the ground at the walls.
- Fill in any low spots so the rain doesn’t have a tendency to puddle next to the wall.
- Make sure your downspouts are getting the water away from the soil around the basement.
- Make sure your downspouts aren’t broken underground and leaking water into the soil near the basement.

For the most part this sort of stuff should do the job. In some rare cases the house may be situated so it’s just impossible, i.e. there’s nowhere for the water to flow away to, or it would have to flow uphill. French drains around the foundation walls are one possibility, basically a performated PVC buried in a trench full of gravel, close by the foundation wall. Any water that seeps against the foundation goes into the gravel, into the PVC and drains out to wherever you send it.

I know one guy who had to put french drains inside his basement, i.e. in his basement floor around the edge of the basement, wiht a sump pump to pump it out. I’m still not sure how this helps protect the walls, maybe it simply keeps his basement from filling up with water.

If you plaster (I have no idea if that’s a good idea or not…) contractors I’ve talked to tell me that the big deal with plastering is making sure you do multiple, thin coats and wait at least a day between coats to allow the plaster to dry. Drywall mud dries fast but shrinks a lot. Plaster dries slowly and doesn’t shrink as much.

Of course the real difference between a pro and a DIYer is that their plaster looks as smooth after they trowel it on as mine does after I sand it :-).

-- "Always cut *towards* a major artery... that way you'll be careful."

Oh, and one big gotcha to watch out for is, if you end up remortaring the walls, be very careful to figure out what the right mortar is.

My house’s foundation walls were fieldstone walls and I was warned that a classic DIY mistake is to use portland cement instead of the right mortar. The portland cement is stronger than the stones/bricks, and has a different thermal expansion coefficient, so as the walls freeze and thaw, the cement gradually crushes the bricks…

-- "Always cut *towards* a major artery... that way you'll be careful."

I agree with the previous posts. Remove the old plaster, seal the concrete wall, then re-plaster it. No heavy machinery or specific professional help required, unless you are cautious about the severity of the wall condition. If you need help with another brand of waterproofing paint, try BEHR Premium. My uncle used it for his home and it fixes the problem you are having. It works for porous concrete and masonry surfaces. Is it just this one wall or are there others as well? Hope this unnecessary problem is solved for you soon.

-- Christopher Creek - http://www.deepcreekconstructionschool.com

Thanks much for all the above suggestions. I was visiting my son for 2 months and we had rain and very warm weather during that time. The basement seemed exceptionally dry during that time, so I doubt that moisture is the problem. I tend to agree with Vulpes that the problem is likely the plaster quality. They probably used too much water in the mix, something that inexperienced DIY folks often do.

I know this reply is late in coming, but a replastering won’t be done until next summer, so the help is still very relevant. I appreciate your help with this. We will follow your advice and remove the old plaster first. Thanks again!

-- Mike an American living in Norway

This is a great site for DIYers. I have to admit that I have never really enjoyed DIY work on our
Thanks for your comment Apple200. It’s great to have a site like this to share your experience and also learn from others.

I can’t say that I really enjoy DIY although I have done a great deal of it on several houses over the years including doing my own foundations/basement, out-buildings, my workshop and finished out several basements, not to mention gardens. I do get pleasure from the results though, so the efforts have been worthwhile if not fun.

I’ve had a bad back for most of my life and so my DIY work had caused me a whole lot of pain. I am glad I could do it though since I have saved a small fortune and also could insure that the work was done properly.

My one big consolation is that my wife has worked right along with me on many of our projects and has even taken the leading role on some of them, especially the gardening and the interior and exterior painting, papering, etc.

My hobby is woodworking which isn’t physically demanding, but keeps my hands and brain busy. I have always admired folks who are handy and multi-skilled and so I have tried to emulate them, even though it doesn’t come naturally to me.

-- Mike an American living in Norway

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