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fieldstone foundation with crumbling stucco covering and some mold

My 1876 house is built on a foundation of fieldstone and brick. At some point, both the exterior and interior of the foundation were covered with stucco. Also, someone had covered the interior stucco with plastic sheeting and panelling, which we have removed. The interior stucco is bowed and crumbing in some areas of the basement, and there is evidence of some mold (not too extensive as far as we can see) in some areas. We have removed some of the stucco. We are not sure if we should continue removing the stucco to treat the mold, and, if we do, should it be replaced? Also, can we clean the fieldstone with a detergent/bleach solution, or is there a better approach? And, overall, what is the best way to maintain this kind of foundation?

Re: fieldstone foundation with crumbling stucco covering and some mold

In 1876 the mortar joints for the stone most likely is QUICKLIME AND RIVER SAND.
If a portland cement product was applied over the Lime mortar and covered with plastic it would cause the stucco to fail as described in your post.
Remove all the stucco than repoint the joint mortar with a matching mortar.
Have the mortar checked at a lab for content of lime to sand.
You can find matching mortar at one of the following.
Cathedral Stone.
Lancaster Lime Works.
Rosendale. ( this company purchased Virginia Lime works )
Edison Coatings.
U S Heritage.
If you purchase from them they may do your testing ?

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