Friday, April 20, 2018 at 8:00 AM EDT
Saturday, April 21, 2018 at 3:30 PM EDT

Add to Calendar 


International Masonry Institute 
17101 Science Drive
Bowie, MD 20715

Driving Directions 


Bonnie Chandler 
Association for Preservation Technology International 

Thank you to our sponsors who have contributed to help keep costs affordable for all attendees:




Consigli Logo


D_2 Biological Solution



IBIX Special Cleaning


The Lathan Company


Quintek Corporation Logo


Conservation Solutions



GC Laser Systems





Genco Masonry Logo

Interested in Sponsoring this Program?

Contact us!


April 20 -21, 2018 
International Masonry Institute
17101 Science Drive
Bowie, MD



Day 1:  Principles, technologies and protocols for cleaning historic masonry have been evolving for decades and continue to evolve.  In this new workshop practicing professionals and contractors systematically present and demonstrate the current state-of-the-art in methods, issues and best practices for cleaning.  Suitable for both emerging and experienced practitioners in preservation, the workshop will include:

•    Cleaning Philosophies
•    Masonry Materials and Geology
•    Types of Soiling
•    Cleaning Methods Overview
•    Cleaning Protocols
•    Hands-on Demonstrations of Various Cleaning Techniques
•    Reference Materials
•    Breakfast and Lunch provided
•    Plus, Networking Cocktail Reception with the Speakers and Demonstrators

Day 2:  is a bus tour to the Jefferson Memorial and Architect of the Capitol (AOC) in downtown Washington, DC.

10.0 LU AIA CES Registered credits are available for this 2-day workshop. (APTI04202018)

•    $200 - APT International members
•    $225 - APT-DC Chapter members
•    $275 - Non-members
•    $150 - Emerging Professionals (out of school less than 3 years)
•    $50 - Students
To join APT International and become a member please go to www.apti.org.


Friday, April 20, 2018
8:00 – 8:30 am    Registration, Coffee and Continental Breakfast

8:30 – 9:00 am    Welcome & Introduction
Presenter introductions, sponsor acknowledgements, learning objectives and introduction to the workshop beginning with the overarching questions – “Why Clean?”
Amy Lamb Woods, P.E., International Masonry Institute

9:00 – 9:50 am    Understanding Your Substrate   
An overview of the geology and material properties of the substrates to be cleaned – stone, brick, terra cotta and concrete/cast stone.  Risk factors and counter-indicators for cleaning different types of materials – such as hardness or chemical interactions – will be discussed, as well as available test methods for substrates and their potential benefits to developing a cleaning program.
Amanda Thomas Trienens, Cultural Heritage Conservation, LLC

9:50 – 10:40 am    Types of Soiling
The appropriateness and efficacy of different cleaning methods are directly related to the type of soiling to be mitigated or removed.  This presentation will review the nature of different types of soiling – dirt/soot, efflorescence, salts, biologics, metallic or mineral staining, and graffiti, other paints and coatings, whether visible or not – and their susceptibility to removal.
Sarah Holder, PROSOCO, Inc.

10:40 – 11:00 am    BREAK

11:00 – 11:50 am    Cleaning Methods Overview
An overview of currently available cleaning methods, how they work, and their suitability and risks for different substrates and soiling.  Methods to be presented include:
•    Water – misting, low and medium pressure, hot water/steam, dry ice;
•    Chemical – detergents, acidic, alkaline, chelating agents, solvents, biocides, and poultice methods;
•    Mechanical -  dry hand tool methods, and wet and dry micro-abrasive systems; and
•    Laser systems

New developments in research and/or trials on masonry cleaning will also be discussed.

Roy Ingraffia, International Masonry Institute

12:00 – 1:00 pm    LUNCH (provided)

1:00 – 1:30 pm    Cleaning Project Approach & Methodology
This presentation considers a number of parameters that surround and affect decisions on cleaning – beforehand and during the cleaning project.  These include aligning the purposes of cleaning with expectations, who makes decisions and when, applicable standards, methods of specifying cleaning, developing a cleaning plan, and field considerations such as sequence of work, environment condition, protection, and field testing and mock ups.
Amy Lamb Woods, P.E., International Masonry Institute

1:30 – 4:00 pm    Demonstrations
Attendees will rotate through demonstrations of various cleaning methods by experienced contractors.  Most demonstrations will be performed on the actual masonry of the building.  Demonstrations will include the following categories of cleaning methods:
•    Water, steam, mist methods
•    Chemical methods
•    Micro-abrasive methods
•    Poultices and latex waterless methods
•    Laser cleaning methods

4:00 – 4:30 pm    Q&A Panel Discussion

The day’s activities will conclude with a 30-minute panel discussion with the workshop speakers.

4:30 – 6:00 pm    Cocktail and Appetizer Reception
Continue the dialogue with the speakers, demonstrators, sponsors and attendees over drinks and light appetizers.

Saturday, April 21, 2018
(all times are approximations and subject to change as the schedule is further refined)

9:00 am                     Buses pick up registrants from Comfort Inn, Bowie, MD, followed by Hyatt Regency, Washington, DC

10:30 am                   Buses arrive at Jefferson Memorial

11:30 am                   Lunch (boxed lunches provided)

12:30 pm                   Buses load for Capital Hill

1:15 pm                     Tour with the Architect of the Capitol (AOC) begins

3:30 pm                     Buses depart for Hyatt Regency, Washington, DC, followed by Comfort Inn, Bowie, MD.


A block of rooms has NOT been reserved for this event, however, arrangements have been made to pick-up and drop off at the Comfort Inn, 4500 Crain Hwy., Bowie, MD AND the Hyatt Regency. 400 New Jersey Ave NW, Washington, DC.  SATURDAY ONLY.  The following Bowie, MD hotels are the closest hotels to the International Masonry Institute:
Comfort Inn
4500 Crain Hwy.
Bowie, MD  20716

Hampton Inn by Hilton
15202 Major Lansdale Blvd.
Bowie, MD  20716

Hyatt Regency Washington on Capitol Hill
400 New Jersey Ave NW
Washington, DC 20001


Sarah Holder, PROSOCO, Inc.
Sarah Holder is PROSOCO’s Preservation Specialist. Sarah works directly with customers and provides technical support for issues related to building materials, material degradation and product performance. She also coordinates training programs centered on the needs of the preservation community. Sarah has a master of science in historic preservation and experience providing technical assistance and treatment recommendations for historic restoration projects. She is an active member of the Association for Preservation Technology International and serves on the Board of Directors for the group’s Central Plains chapter.

Roy Ingraffia, International Masonry Institute
Roy is an Associate of the American Institute of Architects (AIA) and a Professional Associate of the American Institute for Conservation of Historic and Artistic Works (AIC). He is an Architectural Conservator with experience in design and contracting capacities and his professional work has primarily focused on the preservation of historic masonry structures through research of traditional materials/ methods and development of contemporary restoration techniques.  In addition to his work with IMI, Roy teaches the Masonry Conservation Seminar within the Graduate Program in Historic Preservation at the University of Pennsylvania and currently chairs the board of the Association for Preservation Technology- Delaware Valley Chapter.

Amanda Thomas Trienens, Cultural Heritage Conservation, LLC
Amanda Thomas Trienens is an architecture conservator providing preservation design and construction services for historic buildings, sculptures, and monuments through her firm, Cultural Heritage Conservation LLC. Her experience is gained from many years in the field working with a variety of structures and art spanning time from the 11th century to the modern age, both locally and internationally. Amanda specializes in masonry conservation documentation, testing, analysis, quality control, and implementation. She studied architecture conservation at the University of Pennsylvania.

Amy Lamb Woods, P.E., International Masonry Institute
Amy Lamb Woods is the Portland Director of Technical Education with the International Masonry Institute (IMI) and a licensed Professional Engineer in Washington, Wisconsin, and Minnesota. Her background combines architecture, historic preservation, and civil engineering materials. Ms. Woods has over 18 years of experience in the field of forensic engineering of building materials, both historic and contemporary structures.  Her experience includes facade and failure investigations with materials such as brick masonry, terra cotta, stone, concrete, terrazzo, and stucco. Her primary interest is with projects involving the investigation and repair of historic masonry and concrete materials. From the University of Illinois at Urbana-Champaign, Ms. Woods obtained a BS in Architecture, MA in Architecture Historic Preservation, and an MS in Civil Engineering Building Materials with a focus on cement chemistry.  She is a Board member for the Association for Preservation Technology International (APT) and founder of Women in Restoration & Engineering (WiRE).