Category Archives: IHBC Area of competence – Intervention

Hot Mixed Lime Mortar – One Day Seminar & Workshop

Saturday 9 June 2018
Location: West Lexham, St Nicholas Church, Norfolk PE32 2QN

Hosted by: Nicholas Warns Architect Ltd in association with SPAB

The day will consist of a combination of talks and practical demonstrations. Suitable for those who have a keen interest in specifying and using the most appropriate building limes, for the repair of historic buildings.

Speakers include leading experts David Wiggins, Structural Engineer, Nigel Copsey, Conservator and Stonemason, and Nicholas Warns, Senior Conservation Architect and SPAB guardian.

Cost £85 per person. Group size 25 to 40 delegates. The cost includes light lunch and refreshments.

Space are limited so please book early to avoid disappointment.

Please send enquiries and bookings to Kate Walpole.
E: <>
T: 01603 622056



Kellogg Urban Knowledge Exchange: Urban Heritage

25 April 2018

Kellogg Urban Knowledge Exchange: Urban Heritage

A multidisciplinary seminar, as part of the Kellogg Urban Knowledge Exchange series, will be held on Wednesday 25th April at 17:00-19:00 in the College Hub.

Five leading voices in the fields of architectural history, architecture, heritage research and urban conservation will pitch their views on how the urban landscape might be managed to celebrate and invigorate the built environment of the past in today’s era of smart cities, reconfigured time scales and new, emerging urban technologies. They will answer the question:

Cities change. How should urban heritage be managed?


Dr Geoffrey Tyack, Emeritus Fellow in Architectural History, Kellogg College

Professor Leidulf Mydland, Head of Community Department, Norwegian Directorate for Cultural Heritage

Debbie Dance, Director, Oxford Preservation Trust

Barbara Weiss, Skyline Campaign


Dr Oliver Cox, Heritage Engagement Fellow, University of Oxford

This is the latest in our series on key urban issues affecting society today. It will no doubt provoke some lively debate #urbankellogg

This event is free and open to all. Booking is required, please book via Eventbrite.

Refreshments will be served from 16:30, the seminar will begin at 17:00. You are welcome to stay for drinks after the event.

Further details here>>

Hot Mixed Lime Mortars Course

24 April & 18 May 2018
Venue: Charlestown Workshops, Fife

Another new course for our lovely building contractors… Have you been asked to make and use hot mixed lime mortars for conservation projects? Not yet? Well, you soon will be… there has been a growing interest in the truly traditional way of producing mortars – by mixing quicklime and sand together in one operation (and possibly with other materials and additions) and critically when it is appropriate to use them post production. Come and brush up your knowledge and skills and able to sell more services in the building conservation industry.

Calce Viva (Italian for ‘alive lime’ aka quicklime).

This one day workshop aims to provide an introductory guide to the preparation and use of’ hot mixed’ lime mortars, that is, mortars prepared by slaking quicklime, sand and natural hydraulic lime binders (and possibly other additives like tallow or pozzolans) to more closely mimic the appearance and technical performance of conservation mortars and in some cases offer advantages in use and technical performance over more conventional ‘cold mortars’. More and more clients and specifiers are asking building contractors to make and use ‘hot mixed’ mortars on their repair jobs, so get ahead of the game and brush up your knowledge and skills with us.
‘Hot mixed’ mortars have a long history of use in the UK, with evidence visible throughout the nation on traditional buildings and structures. Since the lime revival of the mid 1990s however, the preparation and use of conservation mortars has been largely dominated by lime putty bound mortars or ‘cold’ mortars based on natural hydraulic limes (NHLs). Whilst all these mortar types have their place, a renewed interest in the production of what are perceived to be more authentic mortar preparations using quicklime and sand has been growing and this workshop aims to take the building contractor through the process of making and using ‘hot mixed’ mortars safely, constituents to be used, preparation of mortars, correct mixing equipment and critically at which point these mortars should be used for particular applications.

By the end of the course, attendees will be able to recognise traditionally made ‘hot mixed’ mortars in historic structures and buildings and be able to develop the skills to produce and successfully cure ‘hot mixed’ mortars in relation to authenticity, performance, exposure, season, substrate and nature of the masonry repairs required.

Course suitability

This course is aimed at building contractors (including stonemasons, bricklayers, lime workers and labourers) involved in historic building repair, reconstruction and the consolidation of historic structures and give you the confidence to make and use ‘hot mixed’ mortars successfully.

Learning outcomes:

  • Ability to recognise traditionally made ‘hot mixed’ mortars in historic buildings and structures;
  • Ability to make and use ‘hot mixed’ mortars successfully;
  • Understand at which point, post production of ‘hot mixed’ mortars, these mortars should be used.

 Course programme through a blend of theory and practical sessions

  • Health and safety briefing;
  • Historic preparation and use of lime (and other) based mortars;
  • Understanding the range and production methods of lime binders available in the UK today;
  • Understanding other mortar constituents including sands and aggregates, pozzolans and other additives such as animal fats and milk products;
  • Why specify ‘hot mixed’ mortars? Including issues of authenticity, performance, workability and challenges thereof;
  • Causes of failure – including slow slaking, slow carbonation, wet and exposed locations, unpredictable materials and avoiding failures;
  • Making and using hot mixed lime mortars for repairs to traditional buildings– factors to consider, mix proportions, appropriate mixing equipment, when to use ‘hot mixed’ mortars post production and Building Standards;
  • Perceived barriers to specification – including Health and Safety for safe storage of materials, mixing regimes and safety in use.
  • Best practice for the production and use of ‘hot mixed’ mortars.

To book a place on any of this course, please click here, or call us on 01383 872722.

1 Day Rendering & Harling with Lime Course

13 April 2018 
Training Centre, Fife

This course will enable you to apply a variety of lime render finishes to a wide range of backgrounds including matching to existing finishes.

The practical element of this course will cover a range of backgrounds and include undertaking small ‘patch’ repairs to existing finishes. Both hand cast and mechanical applications will be demonstrated and attendees will gain an understanding of a range of surface finishes that can be achieved.

Course Suitability

This course is aimed at those working within the construction industry who have had practical building experience and trowel skills. We are always happy to help learners choose the right course. Please contact us if you would like to discuss which course is suitable for you or your employees.

Learning Outcomes

  • Ability to evaluate substrates and create repair strategies;
  • Determine binder types and mix ratios;
  • Ability to sequence works for application of external lime finishes;
  • Ability to execute the application of external lime finishes successfully.

Course Programme

  • Determine background type, suction characteristics and appropriate preparation requirements;
  • Develop a strategy for application requirements taking into account the building details, location, exposure and environment;
  • Scheduling work – season of working, choosing appropriate access and application method, scaffolding and protection regime;
  • Determine application techniques by hand or mechanically, coat thickness, ensuring successful bonds between coats and ensuring flat work;
  • Explore different types of surface finishes including flattened, textured and lined out finishes;
  • Diagnosing defective work and taking remedial action.

To book a place on this course, please click here, email or call us on 01383 872722.

Traditional Roofing Masterclass

20 April 2018
Venue: Charlestown Workshops, Fife

The roof is often the most striking feature of a building and can be the most original and least altered part of its fabric. In Scotland, a myriad of materials have been used as roof coverings from natural slate, stone, metals and fired earth tiles to heather, marram grass and broom for Highland thatching.

The purpose of the roof can be easily summarised which is to collect all rain and snow and shed from the building and increasingly important, offer a degree of insulation and prevent the spread of flame in the event of a fire. It must also be able to deal with the moisture that is generated within the building and environmental issues primarily wind which will cause materials to lift and tear and heat which causes them to expand and contract.

Rather less obvious and a surprise to many people is the fact that roofs can account for up to 40% of the total volume of a building and can be roughly equivalent to a storey and a half of the building’s height.

This day will look at the barriers and opportunities to preserve the character and appearance of our traditional roofs including skills and availability of materials.

Join us for an alternative Masterclass with opportunities to view demonstrations of traditional roofing practices and a chance to ‘have a go’ (so don’t wear a suit!). All PPE will be supplied (except for site boots)


  • Roz Artis – Scottish Lime Centre Trust
  • Neil Grieve – SLCT Trustee
  • Fiona Fisher – Conservation Officer, Fife Council
  • Scot Ansgeulaiche – Highland Thatching

Course Programme:

09.30 – 09.45 Welcome and context for the day Rosamond Artis, Director, SLCT
09.45 – 10.15 Overview of Scottish roof coverings Neil Grieve
SLCT Trustee
10.15 – 11.15 Denigration of the character and appearance of Scottish roofs in the name of repair and maintenance Fiona Fisher
Conservation Officer, Fife Council
11.15 – 11.30 Coffee
12.15 – 13.00 Traditional Highland thatching practices Scot Ansgeulaiche
Highland Thatching
13.00 – 14.00 Lunch
14.00 – 15.45
Demonstrations and ‘have a go’ sessions including:
  • Traditional Highland thatching
  • Sizing and trimming Scottish slates
  • Setting out a roof for traditional random diminishing courses
  • Lead welding and bossing
Darren Saville of Harrison & Duff Ltd

Neil Grieve

Scot Ansgeulaiche of Highland Thatching

Scott MacAskill of MacAskill Masonry

15.45 – 16.00 Summary of the day Roz Artis

To book a place on this masterclass, please click here, or call on 01383 872722.