Block foundation problem

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New Member
May 18, 2010
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Hi there !

I am currently renting my mother's house. She never noticed she had a foundation made of blocks. I was planning to buy the house so I inspected it roughly and saw a big crack. I digged a lot to help my mother solve this problem and realized some blocks have moved back towards the house (1 inche or less) at a specific corner. Here are some specs:
-Height of basement: 6,5 feet
-Type of soil: sand
-There is no drain but the water is draining well since there is very little water infiltration in one corner (humid wood only)
-The house is located in Quebec, so there is a winter factor
-The house was built in 1975 by a man who lived there for 25 years after
-There is no ciment filling the blocks holes
-There is no waterproofing material between blocks and soil right now

Please look to the provided pictures for more info
To see it very big go to :
or look at the bottom of this thread.

We would like to repair the house and are looking at many options presented by many specialists who came to visit. The options now are:

-Lift up the house and change the foundation for a new ciment one. That is 30 000$ and the basement has to be reconstructed.

-Change the foundation wall of the back of the house and waterproof the rest. That is 20 000$ but the foundation will be more than half made of blocks.

-I heard about filling the actual blocks with ciment... What do you think ?

-Do you have any idea ?

Im not interested about buying a foundation fragile house. My mother can not invest 30 000$ for a repair... Any suggestions ? Feel free to ask for more information.

Thank you very much



Staff member
Jun 5, 2009
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Sussex County, NJ
A mason would be better qualified to answer concerning the moved blocks...but;

There are countless houses with block foundations that are just fine (including mine). Some crack repair and providing proper drainage will go a long way to keeping the blocks strong and secure. If you want the house, the repairs should be quite do-able.