What mortar for tuckpointing old sandstone foundation


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Old 05-27-14, 12:15 AM
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What mortar for tuckpointing old sandstone foundation

Here is some background:
The house has a 100+ year old sandstone foundation. At some point it was covered with some type of mortar and 1 to 2 coats of point. That covering is now falling off or can easily be chipped off in many places. Behind it, the "joints" between the sandstone are just large gaps, holes, and caves filled with sand. I was thinking it might be a good idea to remove the sand and fill it in with mortar.

Questions:
1) Should I remove the sand and fill it in with mortar?

2) What mortar should be used? Everyone I talk to says to just use the Quikrete mortar mix (I believe this uses a masonry cement that is equal parts Portland cement and Lime). But many online advice-givers warn that any cement in the mix will counteract the permeability of the lime, making it not breathable and resulting in horrible damage to sandstone. So I was thinking I might try just mixing up some sand and lime as recommended here, but I have no experience with the mixing and curing process.

3) After tuckpointing, can the wall be painted with a latex paint? Or will any paint make the wall not breathable and cause damage?

Thank you for any ideas!

Bill2
 
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Old 05-27-14, 06:29 AM
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Whatever is loose has to be removed.

Preparing Lime Mortar For Repointing Masonry

That site ^ has info on lime mortar without cement. Go to a masonry supply yard instead of Home Depot. They have more info, products & knowledge.
 
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Old 05-29-14, 08:42 PM
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Thank you for the link! Reliable source with lots of good info.
 
 

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