Cleaning dusty/flaking limestone walls

[Mike West]

I bought an old limestone cellar under a small farmhouse in Kentucky and want to turn it into a livable studio space. The stone walls shed dust and flakes when touched and I'm unsure what's safe to use for cleaning without damaging the mortar. Would a vinegar-based solution be too harsh?

 

[old_humphr3y]

I’ve got a similar setup in Tennessee. Vinegar’s too acidic for limestone. I used a damp cloth and a masonry-safe cleaner from the hardware store. Have you checked if the mortar is lime-based or cement?

 

[Mike West]

I’ve got a similar setup in Tennessee. Vinegar’s too acidic for limestone. I used a damp cloth and a masonry-safe cleaner from the hardware store. Have you checked if the mortar is lime-based or cement?

Thanks for flagging the mortar type. I hadn’t checked that yet. If it’s lime-based, do I need to avoid any specific cleaners or tools beyond the usual soft brush and damp cloth?

If I can confirm the mortar this weekend, I’ll be ready to wrap the thread and start prepping the walls next week. Let me know if you’ve run into any issues sealing the surface after cleaning.

 

[ChicagoDogz]

I bought an old limestone cellar under a small farmhouse in Kentucky and want to turn it into a livable studio space. The stone walls shed dust and flakes when touched and I'm unsure what's safe to use for cleaning without damaging the mortar. Would a vinegar-based solution be too harsh?

bro, don't use vinegar or any acid on that. Limestone is basically compressed calcium, and acid will turn it into fizzy water, destroying the surface and the mortar joints.

Your plan should be: Soft brush + plain water → Dry thoroughly → Apply a breathable stone consolidator/sealer. That will stabilize the dusty surface and keep your new studio clean!

 

[Mike West]

bro, don't use vinegar or any acid on that. Limestone is basically compressed calcium, and acid will turn it into fizzy water, destroying the surface and the mortar joints.

Your plan should be: Soft brush + plain water → Dry thoroughly → Apply a breathable stone consolidator/sealer. That will stabilize the dusty surface and keep your new studio clean!

I'll start with water and a brush. For the consolidant step, is that something I can apply myself in a weekend or does it usually need a pro to get even coverage?

 

[bear pickles]

+1 @old_humphr3y You can also a soft brush or vacuum to remove loose dust. Then use a mild pH neutral cleaner mixed with distilled water for any deeper cleaning. Avoid using hard water as it can leave mineral deposits on porous stone.