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Historic Mortars

Edison Coatings is the ONLY North American source for ALL of the available major historic binders: Lime Putty, Hydrated Lime, Natural Hydraulic Lime, Natural Cement and Portland Cement - Lime. We routinely prepare custom authentic historic mortars for a wide variety of applications of all sizes.

We can work from your existing specifications, mortar analysis or recipe or we can analyze and match your mortar from provided samples. Our custom mortars typically include both custom blended aggregates to match original size, color, shape and composition as closely as possible, and historically accurate binders to match original composition and performance.

Where replication mixes are inadvisable due to poor performance or proportioning of original mortar, we can recommend mix design corrections to make your mortar look like the original, but perform as required.


Primary Period



2000 BC - 19th C.

LP20 Lime Putty
Spec Joint 46L

Natural Cement

19th - Early 20th C.

Rosendale 12M

Portland Cement-Lime

Late 19th C - Present

Spec Joint 46

Hydraulic Lime

Limited Use in North America

BioMix 35




Color Matching & Mortar Analysis Services

The links below provide information on various mortar products within our line, and to mortar analysis and color-matching services:

Natural cement was the binder of choice in North America for large scale masonry and concrete construction during the 19th and early 20th century. This technology is now offered in a series of prepackaged mortars, with or without lime additions.

Rosendale 12M Masonry Mortars

Hydraulic Limes:
BioLime NHL 3.5, NHL 5

Hydraulic Lime Mortars:
BioMix 35, BioMix 50

LP20, 20M, 20S Lime Putty, Lime Putty Mortar, Lime Putty Stucco
A complete range of lime putty and lime putty-based custom mortars and stuccos provides exceptional workability for traditional mortar, stucco and plastering applications.

SPEC-JOINT 46 Custom Masonry Repointing & Rebuilding Mortar
SPEC-JOINT 46 is a series of pre-colored, prepackaged, lime and cement-lime mortars for use in new construction and restoration. Lime mortar is formulated to match traditional historic mortars, and cement-lime mortars are formulated in accordance with ASTM C-270 specifications to provide consistent, reliable results in both performance and appearance. SPEC-JOINT 46 is simply mixed with water prior to use, and is applied in accordance with Standard Procedures for use of masonry mortar. 


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3 Northwest Drive

Plainville, CT 06062 USA

Phone: (860) 747-2220 or (800) 341-6621

FAX: (860) 747-2280

E-Mail: Contact Us

Rosendale Natural Cement Products®
is a registered trademark of Edison Coatings, Inc.

Rosendale Natural Cement Products® are manufactured in the United States of America from 100% American Natural Cement. This is authentic historic material, extracted from historic sources, as originally used in construction of thousands of American and Canadian buildings and structures in the 19th and 20th Centuries. Rosendale 10C Natural Cement and Quick Setting Natural Cement conform to the requirements of ASTM C10/10M-14.

Translantic Natural Cements(TM) are manufactured in the United States of America from USA and globally-sourced components. Translantic Natural Cement conforms to the requirements for Quick-Setting Natural Cement in ASTM C10/10M-14.

Accept No Substitutes!


Edison Coatings, Inc. makes no warranties, express or implied, as to the accuracy or completeness of any of the information contained herein. This publication is offered on a complimentary basis as a service to potential customers or specifiers. While every effort has been made to include complete and accurate information, based on data and information believed to be reliable, it is the sole responsibility of the user to determine its suitability for his own intended use and purposes. Nothing contained herein shall be construed as a warranty or guarantee of any product, process or any other recommendation stated herein. Edison Coatings, Inc. assumes no responsibility for advice given, results obtained, or for any damages whether incidental or consequential, which may be incurred as a direct or indirect result of the use of this information. By proceeding to use this information, user acknowledges and agrees that he is doing so at his own risk, and user indemnifies and holds Edison Coatings harmless against any liabilities, costs or expenses resulting therefrom. Product data and formulations are subject to change without prior notice. All product sales are further governed by the Edison Coatings, Inc. CONDITIONS OF SALE.

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