Increasing airflow under your house will help to prevent excess amounts of moisture and the consequences encountered. Subfloor ventilation in the way of ‘passive’ air vents or ‘active’ motorised fans can help keep the air moving. https://t.co/UZQnh7Jx1Z
The following two pictures are an example of mortar joint (#pointed) finishes. The first is over 100 years old. A lime based mortar with a course quartzite grain throughout. The other, high portland cement #brick tuckpointing, probably only 10- 15 years old and causing more harm.