Specially Formulated Brick, Stone and Terracotta Patching Material
Based on Natural Hydraulic Lime.

Repairing damaged stonework begins by identifying and understanding the reasons for decay. The usual reasons are excessive moisture, poor repairs, mechanical damage and natural decay. A major reason for damage is inappropriate repairs. Hard pointing or cement-based repair materials are very damaging to soft stone. Lithomex, a lime-based material, is flexible, porous, and lets the building breathe. Hard cement-based materials trap in moisture and salts. Patching stone can be very effective, affordable and can be reversible. The patching material must match the color and texture of the existing stone. It must adhere well, be breathable and have similar thermal expansion and weathering characteristics. Lithomex fulfills these requirements in most cases and, when applied by skilled craftsmen, will lend itself to a perfect match.


Click the image below to see the stock colors:

Lithomex Kit

Stock Lithomex Colors:

Lithomex can be purchased in the following ways. Check the store for pricing
1-quart Lithomex non-pigmented and any stock color
1-gallon Lithomex non-pigmented or any stock color
1-gallon Lithomex custom color*
55 pounds Lithomex non-pigmented
55 pounds Lithomex stock color
55 pounds Lithomex custom color*

*Price after initial custom color simulation fee of $125. More Information.

Examples of work performed using Lithomex:

Before Repairs

After Repairs

After Repairs



Before - Rough concrete balcony

After - A family crest sculpted in place



Before - Conshohocken United Methodist
After restoration to the bell tower
After restoration to the bell tower
Repaired brownstone using Lithomex


Built in the late 1800's, this New York City style "brownstone" home is the only one of its kind in Phillipsburg, New Jersey. The brownstones were pulling away from the back-up brickwork and each stone varied in its degree of degradation. The ornate faces of carved brownstone had blistered and exfoliated. St. Astier's Lithomex, a stone and brick repair material was used. Even the minute bedding cracks were repaired using a colored St. Astier Natural Hydraulic Lime for consolidation work. The facade was also completely repointed using only St. Astier Natural Hydraulic Lime and sand.

Photos: (Click a photo to enlarge)


Project: The Princeton War Memorial
Location: Princeton, New Jersey
Architect: Ford Farewell Mills & Gatsch, Architects, Princeton, NJ
Conservator: Aegis Restauro, LLC, Belle Mead, NJ
St. Astier Product used: Custom Colored Lithomex prepared by deGruchy's Lime Works.US


Safety Data Sheets St. Astier Lithomex

Technical Data Sheets St. Astier Lithomex

Specifications Brick / Stone Repair (Lithomex)

Cutsheets St. Astier Lithomex

Leaflets St. Astier Lithomex

User Recommendations & Data St. Astier Lithomex

Miscellaneous Water Ratios and Proper Mixing of Colored Mortars