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Masonry Restoration Projects: Case Studies

A two-day course which uses actual projects to illustrate the development of practical restoration strategies for heritage masonry structures and older buildings utilizing technical concepts

Description

This course has been developed to provide examples of critical factors that can influence the successful restoration of heritage structures and older buildings. Projects will be visually presented as case studies to highlight key technical and practical aspects. Sometimes the presentations will use an individual project - from the investigation stage through to completion of the restoration - and sometimes a number of abbreviated (mini) case studies will be used to cover specific factors. The projects include institutional, residential and municipal buildings, churches, a masonry memorial tower, museums and more - many of them National Historic Sites, and many of them within the Maritimes. A variety of different types of masonry construction and restoration methods will be illustrated by the case studies.

The investigation phases of the projects will illustrate how non-destructive methods can be used to examine hidden conditions, and examples will be used to illustrate where understanding the causes of damage and/or deterioration can be critical to the success of a project. The case studies will also provide examples to illustrate how the development of restoration strategies specifically addressed identified causes - as well as the results and extent of the mechanisms causing deterioration or damage.

The restoration phases of the projects will include many important practical aspects, including how to grout and stabilize traditional rubble masonry, what to consider when repointing heritage brick and stone masonry, how to repair and strengthen cracked masonry, when and how to clean heritage masonry, how to cope with inadequate natural movement accommodation, and much more.

Who Should Attend

The program is ideally suited for owners, property and facility managers, engineers, architects, consultants, inspectors, investigators, technicians, contractors' supervisors and foremen, materials suppliers' sales and technical personnel and trainees. In fact, the course is ideally suited for anyone who wishes to understand the basic requirements for effective and long-lasting restoration of concrete or masonry structures.

Why You Should Attend

In today's business world, reducing risk and avoiding liability are key factors that should be of great concern to everyone. The topics covered within the program have been designed to facilitate learning from the presenter's own experiences using actual case studies to highlight key factors that influence the success or failure of restoration projects.

Special Features

A purpose-designed binder and a USB flash drive containing the Course Manual - plus comprehensive information, photographs, technical data, articles and bibliography - will be provided to each participant. At any time during the course, participants will be encouraged to ask questions, provide comments, and share their own experiences and problems. The cost for both the binder and USB flash drive are included in the registration fee.

Interactive Technical Workshop

At the end of the second day there will be an Interactive Workshop Session, at which time attendees will be invited to share their own experiences - using case studies if possible. If you have a special project you would like to share that illustrates how you resolved specific problems - or you would like advice in this regard from the presenter and the attendees - please email details in advance, together with photographs in jpeg format to Sheila Kyte at sheila.kyte@dal.ca and the information will be forwarded to the presenter, who will incorporate them into his digital presentation. (Please provide at least five working days notice.)

Format

Day 1 - registration/check-in will start at 8:00 a.m. with sessions to begin at 8:30 a.m. and adjourn at 4:00 p.m. Day 2 will commence at 8:30 a.m. and adjourn at 4:00 p.m. There will be 15 minute mid-morning and afternoon breaks, and a light lunch will be provided in the classroom on both days during a half hour break. When registering, please indicate if you have any food allergies.

Outline

The following topics will be presented during the two-day course:

The Importance of Investigation, Monitoring and Cause Analysis - A compilation of mini-case studies will be used to illustrate where structured investigations formed a critical part of the restoration strategy development process. The studies will feature the use of non-destructive testing techniques - such as Ground Penetrating Radar to investigate hidden conditions - as well as movement and moisture monitoring devices, such as laser measuring equipment, displacement gages, and relative humidity sensors. The rationale for selection of the techniques and devices will be presented, together with details of the sometimes critical information they provided.

Accommodating Excessive Differential Movement - An institutional building and a church will be used to illustrate where strategies can be developed to counter excessive differential movement that sometimes occurs between building components. How the strategies can help to prevent re-occurrence of damage will also be presented.

Understanding Masonry Construction & How it Influences Durability - Several mini-case studies will be used to illustrate the considerable number of different masonry assemblies that can be encountered during condition assessments of buildings and structures. The presentation will visually examine and discuss how the transition from traditional mass masonry construction to modern cavity walls sometimes created buildings that suffered accelerated deterioration and damage due to inappropriate design and detailing.

Remediating Deficient Shelf Angles within Cavity Walls - This presentation features a case study of a medium-rise residential building which suffered from the inappropriate construction of shelf angles. The presentation will discuss the overall restoration scope of work and, in particular, how support of upper levels of masonry was provided while remedial work was carried out to correct the design deficiencies which had resulted in damage to the masonry. Mini-case studies will also be included to illustrate other buildings which also suffered the effects of defective shelf angle construction.

Stabilizing, Repairing & Strengthening Cracked Traditional Masonry - Two case studies will be presented to illustrate techniques that may be considered when faced with restoring buildings suffering from severe cracking of masonry components. The causes of the cracking will be evaluated and how this influenced the development of restoration strategies. Below grade waterproofing and the use of core rubble grouting techniques will be presented, together with the installation of retrofit masonry ties and joint reinforcement.

A Holistic Approach to Conserving Heritage Structures - A comprehensive study of how a 100-year old badly damaged art gallery and museum was restored to a durable condition will be presented from investigation to completion. The primary and influencing causes of the damage will be examined, together with some novel techniques that countered what had happened to the building during past restoration and renovation work. The importance of the investigation process and understanding how the masonry assembly can be vulnerable to original design factors will be presented, as well as lessons to be learned when renovation work includes a dramatic change to the gravity load distribution dynamics of a structure.

Cape Race Lighthouse - A History of Restoration - Constructed in 1905, Cape Race Lighthouse is believed to be the oldest reinforced concrete lighthouse in North America. Over the decades, it has undergone three major attempts at restoration, each failing to address the cause of the deterioration - with more damage being the result. The history of these attempts is reviewed by the presentation, together with details of the most recent comprehensive and novel restoration project which - hopefully - addressed both the cause and the result.

Restoration of Fredericton City Hall - Built in 1876, Fredericton City Hall is a National Historic Site. Over the years, restoration work had been carried out to restore cracked masonry - but the cracks either reopened or continued to occur at other locations. This case study will comprehensively review details of the investigation phase which identified several influencing factors that caused the cracks, as well as the restoration work which addressed the causes and restored the building to a durable condition.

A Tale of Two Towers - This presentation highlights the award-winning restoration of a National Historic Site in Guelph, Ontario - the Church of Our Lady Phase I - Tower Restoration project. The deterioration mechanisms will be discussed, as well as the condition assessment process. Also examined will be the way in which the investigations assisted in the development of a restoration strategy to address the serious damage that had occurred - despite major restoration work carried out just 15-years before.

A Tale of One Tower! - The concluding case study highlights major restoration work recently carried out on the Dingle Memorial Tower in Halifax, Nova Scotia, to address the extensive damage that had occurred to both the interior and exterior of the stone tower. The causes of the damage will be discussed, together with the reasons why the masonry had continued to crack - even after previous restoration work had been carried out some years before. The presentation will also highlight the combination of conventional and novel restoration materials and techniques that were used to restore the tower to a durable condition.

Presenter

Paul Jeffs is an independent consultant who, for over 25 years, has specialized in providing technical advice and consulting services for the design, construction, restoration and protection of concrete and masonry structures - with particular emphasis on trouble-shooting. He has considerable experience with the investigation of concrete and masonry structures. Prior to forming PJ Materials Consultants Limited, he was employed for over 25 years within the construction industry around the world. Paul has served on the Canadian Standards Association Technical Committee (Associate) and the High Performance Sub-Committee for New Parking Structures (CAN/CSA S-413); he also served on the CSA 266 series of Admixture standards, and is a past director of the Concrete Restoration Association of Ontario. He served as a member of the Technical Advisory Committee to the Ontario Ministry of Housing for the deterioration and repair of existing parking structures, he was a member of the Ontario Ministry of Transportation technical advisory committee for the development of restoration standards and is a member of the National Research Council's Working Group on Repointing Mortars. He has provided materials related expertise as a consultant for numerous industries and has authored many technical papers.

Paul provides courses across Canada on such topics as durable concrete mix design and construction, concrete and masonry structure condition assessments, concrete repair and protection, the restoration of heritage and masonry structures and the design and construction of concrete slabs on grade. He has also regularly presented public and in-house courses in the Middle East. Paul has been a guest lecturer for several Canadian universities, the Canadian Society for Civil Engineering, the Canadian Dam Association, a speaker at many conferences and has authored or co-authored numerous technical articles.