![Permeability & Masonry Restoration [DEMO]](https://images.squarespace-cdn.com/content/v1/5f63a3d8c47b2d03abcc14e6/1605017299831-556YLNOKN79HCK6OZ8Q4/shutterstock_738041350.jpg)
Permeability & Masonry Restoration [DEMO]
A perm rating of 30 or higher is absolutely essential for successful masonry restoration.
![Testing the Bond Strength of a Jahn Limestone Repair [video]](https://images.squarespace-cdn.com/content/v1/5f63a3d8c47b2d03abcc14e6/1604339750505-2PC2WL0MWOI5HD1GGEBB/still+image.jpg)
Testing the Bond Strength of a Jahn Limestone Repair [video]
The limestone repair in the video is 4-5 inches deep and was done with no pins and no bonding agents.