PHL mortar is ideal for repointing historic masonry, including brick, stone, and terracotta, and also suitable for laying and repointing friable masonry units and load-bearing walls.
Product Description
Produced exclusively by Centurywerks, our Maintain PHL mortar is a manufactured hydraulic lime that complies with ASTM C1707 “Standard Specification for Pozzolanic Hydraulic Lime for Structural Purposes.” This quality-controlled mortar offers the low compressive strength and vapor permeability necessary for historic restoration while retaining durability in extreme conditions. It contains no portland cement.
- Moderate compressive strength
- Reduces spalling of soft masonry units
- More elastic than cement mortars
- Reduces stress on masonry units caused by thermal movement
- Higher in vapor permeability than conventional cement-lime mortars
- Wicks moisture out of masonry
- Reduces salt formation and efflorescence
- Manufactured in Chicago from domestically sourced ingredients
- Complies with ASTM C1714 “Standard Specification for Preblended Dry Mortar Mix for Unit Masonry”
Pozzolanic Hydraulic Lime (PHL) in Use
Real-world uses of our Maintain PHL mortar in masonry, plaster, and repair work.
Need Assistance?
Contact us at 773-598-4300 for more information and assistance.
Why Choose CenturyWerks?
Historically Accurate Materials
Precision-matched to historic structures for seamless restoration and durability.
Trusted by Restoration Experts
The go-to supplier for preservationists, architects, and contractors.
Engineered for Performance & Longevity
Designed to match, perform, and last in demanding restoration projects.
Over a Century of Expertise
A legacy of craftsmanship and material knowledge since the 1800s.