2019 Preservation Trades Workshop - Demonstrations

Historic Restoration Mortar's

Jonathan Appell, Atlas Preservation Inc.


How to formulate & apply restoration mortars & composite patching materials 

*History of cements and usage over the past 2000+ years.

*Traditional lime mortar & lime putty

*Roman Cements & American Natural Cements

*Natural Hydraulic Lime (NHL) of varying strengths

*Short History of Ordinary Portland Cements (OPC)

*Pro's & Cons of Portland Cement

*How sands and aggregates, size, shape and chemical composition affect mortars and infill materials.

*Color matching of mortar and infill|


Jonathan is a historic masonry specialist with expertise in gravestone, monument, sculpture and masonry structures In 1986 he founded the New England Cemetery Service, performing excavation, foundations, monument installation and restoration. Since 1999, he has concentrated on the preservation of historic gravestones, cemetery monuments, training, education and planning projects.||Jonathan has conducted workshops throughout the United States and Canada. He has performed conservation projects on many of the oldest colonial tombs and gravestones in America. In 2016, in collaboration with his sons he founded Atlas Preservation, which brings all the varying tools, products, supplies & training to service cemeteries, towns, contractors and the general public.||During 2017 Jonathan worked with historic Jamestown to conserve one of the oldest gravestones in America.


Get the Lead Out: Casting Ornamental Iron Parts

Jason Church, NCPTT


Historically ornamental cast iron fencing was used as railings, balconies, as well parameter surrounds for buildings, and cemetery lots. Traditionally repairs to ornamental cast iron were done in lead and could be done on-site. This demonstration will tech techniques to make molds using modern RTV silicon and cast replacement parts in a lead free alternative.  


Jason Church is a Materials Conservator in the Materials Conservation Program at the National Center for Preservation Technology and Training (NCPTT) in Natchitoches, LA. NCPTT is a research and training office of the National Park Service. Jason divides his time between original research, field work on outdoor sculpture and architectural materials and organizing various training and conferences. He earned his M.F.A. in Historic Preservation from Savannah College of Art and Design and is a Professional Associate of the American Institute for Conservation of Historic and Artistic Works. Church is currently the Conservation Chair of the Association for Gravestone Studies. 


Make Time for Lime! Using Lime-based Mortars and Coatings on Historic Masonry.

Michelle Duhon, Bayou Preservation


Historic interior masonry walls can look beautiful, but in reality they can also be dirty, dusty, cracked, and include ugly old repairs from previous owners. How do you improve the appearance of your masonry wall without doing more damage to the wall itself? Step away from the concrete and paint, and consider using lime-based products to repoint your wall and apply a variety of limewashes and mineral coatings! We will provide instructions on how to mix lime-based mortars, repoint, work with/around historic plasters, and demonstrate the different options and chemistries of fully breathable limewashes and mineral coatings that you can apply to your historic masonry.


I am Michelle Stanard Duhon, and I first fell in love with historic preservation when my parents would drive me through their hometown of Mobile, Alabama. I received a Bachelor of Arts in History and Art History from the University of Georgia, and then a Master of Science in Historic Preservation from the University of Texas School of Architecture. I have worked as an Architectural Designer, a General Contractor, and a Conservator. I currently live in New Orleans where I own a materials conservation firm called Bayou Preservation. We are a team of 6 that specializes in restoring masonry, stone, and plaster, and we do a lot of work in the famous historic cemeteries of New Orleans!


I Know Enough about Scagliola to Be a Little Dangerous

Sarah Jackson, National Center for Preservation Technology and Training


Scagliola is a mixture of gypsum plaster, animal glue, and pigments that is meant to imitate marble. If you have ever been in a decorative building, like the U.S. Capital Building, that has large stone columns you are likely looking at scagliola. I have made several trips to New York to learn from David Hayles who is a master of this craft and would like to share some of the information I have learned. I am barely more than a novice on the topic, but I love it and it is to interesting not to talk about! I am planning that participants can make a small object themselves to take home with them and finish.


Graduated from Texas A&M University in 2003 with a Bachelors of Environmental Design and from Savannah College of Art and Design with a Master of Arts in Historic Preservation in 2005. While a student at SCAD I came to NCPTT as summer intern and have now been here over 8 years! I completed NCPTT's Study on the Durability of Traditional and Modified Limewash in 2005 and have continued with additional testing. I have spoken on the topic at AIC's Annual Meeting, APT's Annual Meeting, Traditional Building Exhibition and Conference and several times at PTN events. I have also completed research on removing paint from historic bricks and am beginning a study comparing different types of lime for use in mortars.


Why?!?!? Frequent Window Crimes and How to Avoid Them

Sarah Myers, Verdigris Preservation, LLC


After years of fixing windows, patterns emerge - patterns of damage and patterns of poorly thought out and/or sloppy repairs. Learn when a ""leaking window"" isn't a leaky window; discuss the pros and cons of various commonly available repair materials and some lesser known options; understand specific challenges in a sub-tropical environment; and what you can do when you can't do everything the window needs.


Sarah Myers has almost two decades of experience in a variety of construction fields including framing, material reuse and recycling, architectural salvage, historic masonry, and window restoration; how she got here from a BA in French is a tale best told in person.  A native of North Carolina, she has spent the last eight years helping preserve the built environment of New Orleans for the living and the dead. She offers three tips for surviving working outside in a Louisiana summer - towels dunked in ice water, Cheezits, and sweet tea.


Geometry is Practical? Yes! Amazing and fun.

Jane Griswold Radocchia, Jane Griswold Radocchia   Architect

A skill your ancestors used for layout and design; one you can use too, even if you ""don't like math"". --You will lay out the lines, twirl your compass, swing the arcs, and uncover for yourself the patterns of early buildings.

Elevations, floor and framing plans of existing buildings will be used. Instructions in the pattern books of Asher Benjamin, Owen Biddle, Peter Nicholson and Minard Lefever, all published for 'country builders', will be followed.

House-wrights, joiners, and masons used geometry for design and layout well into the Industrial Revolution. Taught through the apprenticeship system - by hands on teaching rather than through the written word - Practical Geometry and facility with a compass was almost lost when much of the knowledge was no longer passed down. You will be practicing skills 2000 years old which have almost disappeared.


Jane Radocchia is an old house architect in the Northeast. Some of the houses she's worked on are over 300 years old, a few only 10. She knows the framing of each of them. |     When she realized that dimensions were not standardized before about 1850,she began to document how masons and carpenters designed and framed structures using geometry.  She continues to research geometric systems and patterns used in pre-industrial construction. ||    She teaches'Practical Geometry', a skill American pattern book writers described as essential to all carpenters. She has taught sessions for TFG and PTN, as well as private groups. Student young and old have practiced laying out frames and buildings beginning with a line, a point, and an arc.|     Jane has a BA (Oberlin College) and an M. Arch (MIT). She lectures and writes about vernacular architecture as well as geometry.  She blogs about Practical Geometry at www.jgrarchitect.com. |


Let The Compass Be Your Guide

Joe Tokarsky, Hale Farm & Village

An introduction to the basics of practical geometry design - use of compass and straight edge to achieve intentional size and shape. From the standard shapes to various curves, and their application in classic building design. Using Asher Benjamin as a guide, we will explore the point, line, perpendicular line, square, triangle, finding various angles, pythagorean theorem, circles, and other shapes derived from its dimensions, arcs, arches, cyma curves, hyperbolic curves, compound curves, hashing out segments within a line, and whatever else may arise.

""Freehand was always my style. After getting more involved in practical application of design, outside of a fine art or expressionist context, consistency in shape is essential."" |Joe is the Preservation and Maintenance Lead at Hale Farm & Village in Bath Ohio. He graduated from Belmont College in St. Clairsville Ohio after spending several years of self employment utilizing building trade skills and knowledge learned through both his work in the family business of furniture repair and refinishing, as well as from his time in art school. Joe holds a BFA from Columbus College of Art and Design.


Slate Roofing - A guide

Bob Zoni, Bob Zoni Inc

Slate roofing and proper techniques of installation and repair. Traditional tools will be used, as well as the Slate Roof Bible will be used as a guide.

Bob Zoni has been involved in the slate roofing business for over 25 years. He has been apart of the PTN family since 1997. He has worked on historical buildings and traveled as far as Europe to learn the trade well.