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    MSTmom's Avatar
    MSTmom Posts: 3, Reputation: 1
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    #1

    Jul 16, 2011, 08:28 AM
    Moss growth on cinder block foundation?
    The foundation on the front (north) of my house( built in 1940) has moss or mold growing on and in it. I have washed and pressure-washed the blocks and noticed that the block is disintergrating. Can this be repaired? And how.
    Thanking you in advance.
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #2

    Jul 16, 2011, 08:54 AM
    STOP using a pressure washer. Using strong chemicals and/or a high pressure washer will destroy the block. Hollow block is only compressed in a mold and are not solid. Scrub the block with TSP and a stiff brush, hose wash and dry. Then get Quickcrete vinyl patcher and smooth a coat over the block. If the joints are bad you may also need to tuck point the joints. After everything is dry and sets for a couple of weeks, paint the block with a masonry paint. You can keep moss and mildew down with commercial products sold at HD or Lowe's, ACE and others.
    MSTmom's Avatar
    MSTmom Posts: 3, Reputation: 1
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    #3

    Jul 16, 2011, 03:39 PM
    Thank you so much for the information. We will give it a try.
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #4

    Jul 16, 2011, 07:55 PM

    Do you know for sure you have cinder block or is it actually concrete block?
    MSTmom's Avatar
    MSTmom Posts: 3, Reputation: 1
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    #5

    Jul 17, 2011, 04:11 AM
    Comment on ballengerb1's post
    Since the house was built in 1940, I'm assuming it is cinder block.
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