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Old 11-12-2015, 10:22 AM   #1
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1910's Stone Basement Parging Interior


Thanks for looking at my post. I am no expert on masonry, so forgive my ignorance on the topic. It'd be great to hear some validation the research I've found.

My house was built in the 1910s in Philadelphia has a stone foundation. I've experienced no leakage, but I do notice that the parge coat on top of the wall crumbles in certain areas and a fair amount of efflorescence. My question is pretty general in how do I maintain my walls correctly and is it possible to prevent the accumulation of dust/sand near the foot of the basement walls.

The research I've done tells me I should repoint any loose joints and then parge a permeable outer coat using a lime based mortar. Essentially, the parge coat is there to be more forgiving than the mortar joints and it is by design for them to crumble.
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Old 11-12-2015, 10:31 AM   #2
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Here are some photos of the wall... (Attached)

Anyone have any idea what that pipe is for? Can I remove it?

Thanks again!
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1910's Stone Basement Parging Interior-20151112_065957.jpg   1910's Stone Basement Parging Interior-20151112_065936.jpg   1910's Stone Basement Parging Interior-20151112_070138.jpg  
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Old 11-14-2015, 06:04 AM   #3
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moisture behind the parge coat's usually the issue - doesn't take much,,, in general, sweep up & dispose of the dust/sand every month if its a bother

IF you want to tackle a fnd/bsmnt wall rebuild, that's a different issue,,, you WILL be an expert by the time you're done
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Old 11-14-2015, 10:15 AM   #4
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Thanks for the advice. That's what I'll continue to do on this side of the wall. The other side needs a bit more TLC, seems like water penetration through the window and the stone doorsteps.
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Old 11-14-2015, 10:16 AM   #5
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Guess I'll be sealing this up today...
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Old 11-14-2015, 11:43 AM   #6
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waterproofing's done outside but calls for complete excavation down to the foundation...expect our home has 1 but may not,,, not uncommon to see laid up stone walls & that's it

anyway, back to 'how',,, clean the exterior, make whatever mortar repairs needed, install a proper footer drain, waterproof (basf/sonneborn/meadows/pacific polymers are a few), tack on waffleboard, & backfill in compacted lifts,,, above grade you can add mechanically fasten;d expanded metal lath & apply waterproof parging for appearance sake
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