Description
Historic Restoration Mortar is a two-component, fast setting, lime-based, latex modified patching mortar built for stone repair work where the finish has to read as natural limestone, not a modern patch. Mixed at a 5 to 2 ratio, it sets in about 30 minutes at 75 degrees, so crews are not waiting around between steps on a repair schedule.
Where Historic Restoration Mortar Is Used
Masons use this mortar on historical building restoration, filling Dutchman joints, and patching pits, holes, and chipped edges on steps, sills, and stone trim. The mortar can also go on as a slurry coat over larger repair areas. Because it resembles a natural limestone finish once cured, it works on visible repair surfaces where color and texture matching carry as much weight as structural bond strength.
How Historic Restoration Mortar Performs
The mix stays workable through a 20 minute pot life, then sets within 30 minutes and reaches full cure at 24 hours. It is UV stable, breathable so moisture can move through the patch rather than trap behind it, and finishes without sanding or grinding. It works faster than Last Patch Limestone for crews who want a quicker turnaround on smaller repairs.
Specifications
| Property | Value |
|---|---|
| Mix ratio | 5 parts A to 2 parts B |
| Set time | 30 minutes at 75F |
| Pot life | 20 minutes |
| Cure time | 24 hours |
| Max application thickness | 1 inch per application |
| Coverage, 7 lb kit | 75 sq ft at 1/8 inch |
Kits come in a 7 lb size (5 lb A, 2 lb B) for spot repairs and a 63 lb size (45 lb A, 18 lb B) for larger jobs, across a range of stock colors. Browse specialty repair chemicals for related patching and restoration products, and see Bonstone for the full color chart and technical data.
Need Help?
Need help matching a mortar color to existing stone or sizing a kit for your repair area? Call (800) 220-1966 or email [email protected].
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