The Curriculum

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Guildhall’s inaugural training program brings together craftspeople, preservation professionals, architects, contractors, and serious students of the traditional building arts for a focused, small-group learning experience at the Benjamin Bosworth House (c. 1791), known locally as The Castle.

The Castle provides an extraordinary setting for training, allowing participants to study and work directly within an intact eighteenth-century structure rather than relying on mock-ups or simulated materials.

The program combines direct instruction, live demonstration, and hands-on practice in traditional materials and methods. Participants work alongside experienced instructors while gaining practical knowledge rooted in real preservation conditions rather than simulated exercises.

Guildhall is a non-commercial, education-first initiative grounded in craft knowledge, material literacy, and evidence-based preservation practice.

Participants leave the program with practical experience and a deeper understanding of traditional building materials and repair methods. Through hands-on instruction and live demonstrations, they gain the skills and judgment needed to assess historic fabric, work confidently with traditional materials, and make informed preservation decisions in real-world projects.

3-Day Hands-On Training Track

  • The three-day track follows a structured daily rhythm of instruction, demonstration, and supervised application.

  • Each morning begins with a short lecture and live demonstration introducing the materials, tools, and methods used in the day’s workshop. Instructors explain not only how materials are used, but why they behave as they do in historic buildings.

  • Participants then move into their assigned workshop areas for supervised hands-on work. Afternoon sessions allow for deeper practice, problem-solving, and skill development under close instructor guidance.

  • Across the three days, participants gain direct experience with traditional materials and methods while developing a stronger understanding of how to make appropriate preservation decisions in the field.

  • Note: Participants may select different workshop modules across the three-day program. For example, a participant may choose to attend three consecutive days of lime plaster training, or combine different sessions—such as one day of lime plaster, one day of linseed oil paint systems, and one day focused on floor finishes.

  • Workshop selection is available on a first-come, first-served basis.

Workshop Modules

Building with Breathable Walls: Demystifying Lime Plaster

  • This module introduces participants to lime plaster as a breathable building system essential to the health of historic structures. Participants will examine historic plaster in situ, distinguish lime from gypsum, identify plaster systems, diagnose failures, and determine appropriate repair strategies.

  • Hands-on work includes mixing traditional lime putty mortars and applying scratch, brown, and finish coats using essential plastering tools.

Capacity: Two groups of six participants

Instructors: Joelle Hunts Berry and Henry Orton. Learn more about the instructors here.

Heritage Finishes Masterclass: Linseed Oil Paint, Distemper, and Limewash

  • This module explores traditional interior and exterior finishes used on historic buildings, with a focus on breathable, compatible coating systems. Participants will learn where and why these materials should be used, how to assess and prepare substrates, and how to apply them properly.

  • The session also addresses the damage caused by incompatible modern synthetic coatings and helps participants evaluate materials through the lens of preservation and building science.

Capacity: Two groups of six participants

Instructors: Interior: Maeve Woolley. Exterior: Michiel Brouns and Peter Galloway Learn more about the instructors here.

Window Restoration Masterclass: Traditional Sash Repair and Linseed Oil Finishing Systems

  • This module focuses on the conservation and repair of historic wooden sash windows using traditional materials and methods. Participants will learn safe worksite setup, sash removal, condition assessment, paint and glazing removal, wood preparation, glass resetting, putty application, and breathable finishing systems.

  • The workshop emphasizes repair over replacement and demonstrates why well-maintained historic windows can continue to perform for generations.

Capacity: One group of six participants per day

Instructors: Justin Fink. Learn more about the instructors here.

Cleaning, Repair, Aging, and Finishing of Historic Wood Floors

  • This module focuses on the preservation-informed renewal of historic wood floors through cleaning, restrained repair, wood integration, and traditional oil finishing systems. Participants will work through sequencing, surface preparation, repair judgment, color integration, and the application of polymerized tung oil finishes.

  • This track is ideal for those seeking a rigorous introduction to traditional preservation practice in an accessible format.

Capacity: One group of six participants per day

Instructors: Rob Cagnetta. Learn more about the instructors here.

2-Day Demonstration Track

  • The two-day demonstration track introduces participants to the principles, materials, and philosophy behind traditional building preservation through a series of lectures and live workshop demonstrations.

  • Day One focuses on the architecture and historic finishes of the Bosworth House, the logic of traditional breathable coating systems, and introductory demonstrations across each workshop discipline.

  • Day Two builds on that foundation with deeper exploration of traditional materials, wood finishes, repair logic, and preservation decision-making, followed by more detailed demonstrations and discussion in each workshop area.

  • This track is ideal for those seeking a rigorous overview of traditional preservation practice in a highly accessible format.



Schedule at a Glance

3-Day Hands-On Training Track

May 29

Day 1 – Hands-On Training

Groups 1 & 2: Lime Plaster

Instructors: Henry Orton and Joelle Huntsberry

Location: Merchant’s Store Room

Group 3: Interior Paint Removal & Repaint

Instructor: Maeve Woolley

Location: Entryway

Group 4: Sash Window Repair

Instructor: Justin Fink

Location: Workshop

Group 5: Floor & Trim Repair

Instructor: Rob Cagnetta

Locations: Dining Room

Group 6: Exterior Paint Removal, Repair & Repaint

Instructors: Michiel Brouns and Peter Galloway

Location: Exterior

Afternoon sessions continue in assigned areas, with plaster groups moving into separate locations for focused instruction.

Lunch and refreshments provided

Evening: On-site Happy Hour Meet & Greet

May 30

Day 2 – Hands-On Training

A second set of participant groups follows the same workshop structure and rotation format.

Groups 1 & 2: Lime Plaster

Instructors: Henry Orton and Joelle Huntsberry

Location: Merchant’s Store Room

Group 3: Interior Paint Removal & Repaint

Instructor: Maeve Woolley

Location: Entryway

Group 4: Sash Window Repair

Instructor: Justin Fink

Location: Workshop

Group 5: Floor & Trim Repair

Instructor: Rob Cagnetta

Locations: Dining Room

Group 6: Exterior Paint Removal, Repair & Repaint

Instructors: Michiel Brouns and Peter Galloway

Location: Exterior

Afternoon sessions continue in assigned areas, with plaster groups moving into separate locations for focused instruction.

Lunch and refreshments provided

May 31

Day 3 – Hands-On Training

The final hands-on day repeats the same format with the color-based group schedule.

Groups 1 & 2: Lime Plaster

Instructors: Henry Orton and Joelle Huntsberry

Location: Merchant’s Store Room

Group 3: Interior Paint Removal & Repaint

Instructor: Maeve Woolley

Location: Entryway

Group 4: Sash Window Repair

Instructor: Justin Fink

Location: Workshop

Group 5: Floor & Trim Repair

Instructor: Rob Cagnetta

Locations: Dining Room

Group 6: Exterior Paint Removal, Repair & Repaint

Instructors: Michiel Brouns and Peter Galloway

Location: Exterior

Afternoon sessions continue in assigned areas, with plaster groups moving into separate locations for focused instruction.

Lunch and refreshments provided

2-Day Demonstration Track

June 1

Day 4 – Demonstration Program (Part I)

Morning Lectures:

Historic Architecture and Finishes at The Castle

Demystifying Linseed Oil Paint

Workshop Introductions

Afternoon Lectures:

Live demonstrations in each workshop area

Lunch and refreshments provided

June 2

Day 5 – Demonstration Program (Part II)

Morning Lectures:

Traditional Wood Finishes and Treatments

Traditional Materials in Historic Preservation

Open Q&A

Afternoon Lectures:

Advanced demonstrations and discussion in each workshop area

Lunch and refreshments provided

All non-APTNE members must create a New User account before registering at the link above.