You need to get the brick repointing of your historic home done correctly to avoid various issues and problems over time. Repointing your brick is an essential maintenance task for older brick homes. Here are some potential consequences of not getting it done correctly:

1. Structural Integrity: Failing to repoint correctly can compromise the structural integrity of your historic home. Missing mortar or mortar deterioration can allow moisture to penetrate the walls, causing bricks to weaken and eventually lead to structural issues. 

2. Water Damage: Incorrect repointing can cause improper water drainage, including interior leaks, mold growth, and rotting of wood components within the walls. 

3. Decreased Energy Efficiency: Improperly repointed walls may allow drafts and heat loss, reducing the energy efficiency of your historic home. Resulting in higher heating and cooling costs.

4. Aesthetic Issues: Repointing is not just about functionality; It also affects the appearance of your historic home. Incorrectly matched mortar color or sloppy work can diminish your property's historic charm and curb appeal. 

5. Costly Repairs: Neglecting proper repointing can lead to more extensive and expensive repairs in the future. Delaying repointing can result in replacing damaged bricks or undertaking major masonry restoration work. 

6. Historic Preservation: With your historic home, preserving its historical value is essential. Incorrect repointing can damage or alter the original character of your historic home, potentially leading to issues with historic preservation regulations. 

To avoid these problems, hiring a qualified and experienced historic masonry restoration specialist specializing in historic brickwork is essential. They should use the appropriate materials, techniques, and tools to ensure your brick repointing is done correctly and in line with the historic character of your home. Properly executed repointing can extend the life of your historic brick home while preserving its aesthetic and historical value.