Level: Intermediate
Instructor: Jon Owens
Cost: $75
Course Description
Lime is at the heart of traditional masonry—and understanding how it works is essential for anyone repairing or preserving historic stone or brick structures. In this intermediate course, students will explore the fundamentals of lime as a building material, including types of lime, curing processes, and the role lime plays in breathability and long-term durability.
Building on concepts from Historic Masonry 101, this class continues on theory-to-practical application. Students will learn how to identify appropriate lime mortars for different historic structures, mix batches to proper ratios, and learn the concept of small test patches using traditional tools and techniques. The session also covers common mistakes in repointing, how Portland cement impacts older buildings, and how lime mortar supports long-term preservation.
Students will learn:
The Basics of Mortars in Historic Structures
Differences between hydraulic and non-hydraulic lime
How to assess existing mortar and choose appropriate replacements
Proper mixing techniques and ratio adjustments
Safe handling and storage of lime
Who Should Attend?
Ideal for DIYers, preservation enthusiasts, trades apprentices, and homeowners with historic masonry buildings. Completion of Masonry 101 is required.
Takeaway:
Participants will leave with a deeper knowledge of the types of limes used in historic buildings and how they are used. These points are keys to understanding proper installation which will be covered in the next two classes.
Financial assistance available, if needed. Please email Info@LancasterWorkshop.com.
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The Basics of Mortars in Historic Structures
Differences between hydraulic and non-hydraulic lime
How to assess existing mortar and choose appropriate replacements
Proper mixing techniques and ratio adjustments
Safe handling and storage of lime
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For more than 30 years, Jon Owens led his own historic preservation firm specializing in masonry restoration, slate and tile roofing, and custom millwork. His craftsmanship can be seen on projects ranging from the 1796 Cunningham House and Christ Lutheran Church in Gettysburg to Washington, D.C. landmarks like the Blair House and Potomac Annex — and countless homes and historic sites in between.
He brings not only deep technical expertise, but a genuine love for old buildings and the stories they hold. Jon is passionate about preserving historic structures using renewable, healthy materials that allow buildings to breathe and last. Known for his integrity, care, and commitment to doing the job right, he’s eager to share his knowledge and help others learn how to repair even the most challenging historic structures with confidence and respect.
Jon is also the founder of Lancaster Lime Works in Lancaster, PA — a company dedicated to producing and promoting 100% natural, breathable lime mortars, plasters, and finishes for historic buildings. Through Lancaster Lime Works, Jon has helped homeowners, contractors, and preservationists across the country repair old structures using time-honored, sustainable methods and materials.
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We know life happens! If you need to cancel or reschedule your workshop, here’s how it works:
More than 7 days before class → Full refund (minus a 10% admin fee) or a 100% credit toward another workshop (good for 6 months).
1 day before class → No refund or credits.
No-shows → Not eligible for refund or credit.
If we cancel a workshop → You’ll get a full refund or a 100% workshop credit — your choice.
*Special note: If you’re sick or have an emergency, please reach out at least 24-48 hours before class. We’ll do our best to offer a credit or transfer.
To cancel or request a change, email us at Info@LancasterWorkshop.com or call 717-478-4199.