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I’m working on a fieldstone chimney in the mountains built in 1912 that has crumbling lime mortar. I know using portland-cement mortar on old bricks is harmful, but is it correct to use it on granite? It is also in a seismic zone.
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Kevin, portland should have no harmful effects on granite. But you bring up another important issue: seismic activity!
Where are you located. And are you just patching or rebuilding? Do you want to install an energy-efficient retrofit? In California, we usually demolish field-stone chimneys and rebuild them with red iron and 5/8" cdx shear wall with a retrofit firebox. The salvaged field-stones are then split and attached as veneer.
A little more info would be helpful.
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I'm working on a fieldstone chimney in the mountains built in 1912 that has crumbling lime mortar. I know using portland-cement mortar on old bricks is harmful, but is it correct to use it on granite? It is also in a seismic zone.