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  1. #1
    Join Date
    Mar 2009
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    231

    Default Hydraulic Cement Falling Out

    1920s home that probably has a stone foundation. The interior is parged with cement. A few months ago I removed all of the loose paint, used bleach to clean mineral deposits, rinsed with clean water, did a hydraulic cement patch, and applied drylok after a week of drying+curing. Now I have 2 issues:

    1. The mineral deposits are back and have leeched through the drylok. No idea what I did wrong. I thought it would have held back the moisture and maybe peeled off a little. I think someone recommended bleach here or another forum so i don't know if that was the issue.

    2. The hydraulic cement is peeling away from the hole. I understand you usually want to inset a patch like this but I have no way of doing this unless I remove a substantial chunk of the wall. The hole I am trying to patch is about 10 inches in diameter. Think of the shape of a crater on the moon.

    Overall I know moisture comes from outside but it's all concrete so I don't really want to dig everything up to waterproof outside.
    Last edited by dcalabro; 09-11-2012 at 03:19 PM.
    My advice and opinions come from hands on knowledge...and This Old House Hidden Content

  2. #2
    Join Date
    Jun 2009
    Posts
    254

    Default Re: Hydraulic Cement Falling Out

    Check on XYPEX Concentrate DS - 1
    Use this than use your patch material.
    www.xypex.com

  3. #3
    Join Date
    Jun 2007
    Location
    Fayette County, Ohio
    Posts
    5,557

    Default Re: Hydraulic Cement Falling Out

    Hydraulic cement expands as it dries, I would think you would want that property in a patch.

    Jack
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

  4. #4
    Join Date
    Mar 2009
    Posts
    231

    Default Re: Hydraulic Cement Falling Out

    I understand it expands as it dries but as it expanded over months it pulled away from the hole. I'm just not sure if there is a better type of patch or if there is a better way to get it to stick.
    My advice and opinions come from hands on knowledge...and This Old House Hidden Content

  5. #5
    Join Date
    Jun 2007
    Location
    Fayette County, Ohio
    Posts
    5,557

    Default Re: Hydraulic Cement Falling Out

    Not a big concrete man, but have heard you sometimes need a bonding agent.

    Jack
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

  6. #6
    Join Date
    Jun 2009
    Posts
    254

    Default Re: Hydraulic Cement Falling Out

    Quote Originally Posted by dcalabro View Post
    1920s home that probably has a stone foundation. The interior is parged with cement. A few months ago I removed all of the loose paint, used bleach to clean mineral deposits, rinsed with clean water, did a hydraulic cement patch, and applied drylok after a week of drying+curing. Now I have 2 issues:

    1. The mineral deposits are back and have leeched through the drylok. No idea what I did wrong. I thought it would have held back the moisture and maybe peeled off a little. I think someone recommended bleach here or another forum so i don't know if that was the issue.

    2. The hydraulic cement is peeling away from the hole. I understand you usually want to inset a patch like this but I have no way of doing this unless I remove a substantial chunk of the wall. The hole I am trying to patch is about 10 inches in diameter. Think of the shape of a crater on the moon.

    Overall I know moisture comes from outside but it's all concrete so I don't really want to dig everything up to waterproof outside.
    The white deposits are effervescence / salts this will cause the new and old to push away from each other.
    The Xypex product will stop this process.
    For the patching material use a product like Quickrete Heavy Duty Masonary Coating.
    Or use anyother repair type mortar.
    Also there are Epoxy's available for concrete repairs.

  7. #7
    Join Date
    Jun 2007
    Location
    Fayette County, Ohio
    Posts
    5,557

    Default Re: Hydraulic Cement Falling Out

    Clarence is the Xypex product also a bonding agent or don't you think one is needed.

    Jack
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

  8. #8
    Join Date
    Jun 2009
    Posts
    254

    Default Re: Hydraulic Cement Falling Out

    Xypex is not a bonding agent.
    Before using a bonding agent understand that most agents are Re emulsionable.
    If a bonding agent is needed use a mixture of 1 part cement 1 part sand and water to make a brushable sulry and dash it on than use the Xypex.But if the existing concrete contains Salts than the bond maybe broken. Xypex would stop the migration of the moisture thru the affected area.

  9. #9
    Join Date
    Dec 2012
    Location
    Southern Ontario Canada
    Posts
    38

    Default Re: Hydraulic Cement Falling Out

    Have had some extensive experience working with stone, block, clay basement foundation walls. After years of battling water infiltration from the inside out the only sure way is to dig from the outside, repair, lay new weeping system and forget about it.

    If this is just not an option which is understandable, you can do a few things to limit the infiltration of moisture thru that foundation wall.

    1) Ensure that all down spouts from the eaves divert water well away from the exterior walls.

    2) Check the grade of the gardens, walkways, lawn, driveway and ensure there is a good slope away from the foundation wall.

    3) If the downspouts drain directly into a storm sewer often debris including tree roots, severed clay tile as well as a dozen other reasons the water saturates the area as it does not make the run to the sewer system. In turn this water takes the route of least resistance and developed drain plains towards the foundation wall. A plumbers scope will determine if you have proper drainage.

    Back to the repair. Best results for interior to exterior repairs are achieved by drilling through the foundation from the interior beyond the existing wall and injecting hydraulic slurries at low pressure hoping to seal the voids from the exterior.

    That effervescence you are seeing is that moisture coming thru. Don't forget not all moisture is a liquid. But make no mistake there is moisture evident in your wall.

  10. #10
    Join Date
    Mar 2009
    Posts
    231

    Default Re: Hydraulic Cement Falling Out

    The property is in an urban setting with concrete directly in front of the wall for 8 feet to the asphalt street. Otherwise, I would have no problem hand digging by myself. I've seen shows where they put sheets of foam insulation directly against the wall. Is this possible or will it still cause issues? My thought being if its truly impossible to stop 100%, how do you deal with it without health/building concerns over the long term?
    My advice and opinions come from hands on knowledge...and This Old House Hidden Content

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