crumbling exterior foundation in older home early 1900


  #1  
Old 01-18-04, 05:41 PM
Poboly
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crumbling exterior foundation in older home early 1900

The exterior foundation of our home is cracking and looks shabby. So far we have no leaks or moisture, however that is just a matter of time. What is the proper way to fix this problem? Any and all suggestions are welcome. Poboly
 
  #2  
Old 01-18-04, 07:49 PM
C
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If this is crumbling mortar, tuck pointing is the preferred method of repair. The first step in repairing mortar on walls as old as these is to have the current mortar analyzed so that the replacement mortar matches it in physical qualities. Modern mortar is much harder than the old mortar and its use can cause the wall to fail.

Having a mason come evaluate the project can give you an idea of the scope of the project.

See this discussion also.

http://forum.doityourself.com/showth...hreadid=155921

Hope this helps.
 
  #3  
Old 01-19-04, 09:11 PM
I
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I have done some similar jobs....
In an old hospital underground walls, the plaster was more like sand than anything else....the exterior behind it was made of small blocks.

Here is how this was done successfuly:

1. Take off / scratch sandy layers untill you reach the strongest possible layer (even if its still sandy).
2. Make a mix of 50 percent water and 50 percent glue.
pour/brush it on the wall and make it soak as deep as possible. (Dont do several layers, do it all at once and dont make the wall wet before).
3. make a next mix: water and glue (50/50) as above. put cement on it and create a sort of "thick paint". Brush it on the wall while it is still wet/humid (on top of the former, still-wet layer).
4. Make a new plaster mix and put the same kind of glue in it.
While the wall is still humid (from the "thick paint" layer), put the plaster on.

This will hold unbeliavably strong.

The thing to notice is never to let a layer dry before you put the next one. Otherwise- the dried glue layer will resist the next layer since it will be an "anti-water' layer (the dried-up glue will not let anything stick on it).

You can also apply a mesh or rebars-net if the situation is extreme,and connect it to the wall at first.
 
 

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