Home>Discussions>INTERIORS>Living Areas & Workspaces>1857 Stone foundation - a sandy (plaster?) loss from the foundation stones.
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jssatt
1857 Stone foundation - a sandy (plaster?) loss from the foundation stones.

Stone foundation is covered with what appears to be plaster similar to the plaster in the wood lathe walls Troweled onto the stone. Not a waterproofing product as it not on the cinder block closing the summer kitchen fireplace et al. Plaster is painted - accumulated about three gallons of plaster on concrete floor. Also cracks similar to plaster. Is there a way to seal/coat walls to eliminate this. No water problems currently in the cellar - minimal moisture during severe weather. Would much prefer not to have to remove all of the stuff as it would be very labor intensive. Is closed cell spay an alternative?

Timothy Miller
Re: 1857 Stone foundation - a sandy (plaster?) loss from the foundation stones.

Howdy sounds like you are having the outcome of old cement deteriation. Over time the concrete is leached out of the sand and concrete mix leaving just sand that deteriates.. Have seen stone foundations fail due to this type of deteration. Make sure any down spouts drain well away from this area and that no plants that need watering are within 5' of this area and any sprinklier heads only spray away from this area. You might benifit from having a mason come and inspect to see if you need to do repairs to the foundation before you cover up the deteration....

jssatt
Re: 1857 Stone foundation - a sandy (plaster?) loss from the foundation stones.

Thanks,

I have provided some pictures. Do these appear to be consistent with your comments? All drainpipes extended underground well away and no watering or sprinklers are used near the house. Stays dry except under heavy conditions. Have lived in the house over 30 years and this loss is consistent. You mention seeking advise from a mason prior to covering - what would be the recommended cover. Can you suggest any specific qualifications for a mason?

thanks again,

JLMCDANIEL
Re: 1857 Stone foundation - a sandy (plaster?) loss from the foundation stones.

Considering the age of the foundation, the parging may have been done with lime/sand mix rather than Portland cement/sand mix. The mix is still used today in repair and maintenance of old buildings. A good mason should be able to repair and re-coat.
Jack

Timothy Miller
Re: 1857 Stone foundation - a sandy (plaster?) loss from the foundation stones.

Hi good mason... one whos been doing it for along time.... ask some local contractors whom they'd use/ if a block supply company in your area they would know whom does great work too...
Reguarding covering the wall. Spray foam once the wall reviewed an repairs made, if you want to insulate the wall foam a great $$ choice.

jssatt
Re: 1857 Stone foundation - a sandy (plaster?) loss from the foundation stones.

Thanks - we'll be looking for a mason now that we know what is required.

oldsyd
Re: 1857 Stone foundation - a sandy (plaster?) loss from the foundation stones.

Could some of the masons here explain what type of mortar should be used on limestone block foundations? I've heard people say to not use lime based cement. What type of cement should someone use?

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