Context 154 - May 2018

www.ihbc.org.uk @IHBCtweet Registered as a charity in England andWales number 1061593 and in Scotland number SC041945. Company Limited by Guarantee. Registered in England number 3333780. Registered Office: Jubilee House, High Street,Tisbury, Wiltshire SP3 6HA Officers President David McDonald, president@ihbc.org.uk Chair James Caird, chair@ihbc.org.uk Vice Chair Kathryn Davies, vchair@ihbc.org.uk Secretary Jo Evans, ihbcsecretary@ihbc.org.uk Treasurer Jill Kerry, treasurer@ihbc.org.uk National Office Director Seán O’Reilly, director@ihbc.org.uk Operations Director Fiona Newton, operations@ihbc.org.uk Consultations Coordinator consultations@ihbc.org.uk Membership Services Officer Carmen Moran, membershipservices@ihbc.org.uk LETS Officer Kate Kendall, lets@ihbc.org.uk Branch & Events Support Officer Carla Pianese, support@ihbc.org.uk Administration Officer Lydia Porter, admin@ihbc.org.uk Committee Chairs Policy Roy Lewis, policy@ihbc.org.uk Membership & Ethics David Kincaid, membership@ihbc.org.uk Finance & Resources Jill Kerry, resources@ihbc.org.uk Education Andrew Shepherd, education@ihbc.org.uk Communications & Outreach Dave Chetwyn, communications@ihbc.org.uk Branch Officers North vacant NorthWest Crispin Edwards, 07768 502363 Yorkshire Matthew Bentley, 0113 247 8145 West Midlands vacant East Midlands Roy Lewis, 01623 756623 South Julia Foster, 01296 585888 SouthWest vacant East Anglia vacant South East Sanne Roberts, southeast@ihbc.org.uk London Sheila Stones, 01223 582716 Scotland Paul Zochowski, 01620 827264 Wales John Edwards, 07796 440934 Northern Ireland vacant Republic of Ireland Cormac O’Sullivan, 00353 5677 62907 Workingwith limeand stone Identifyingbuilding stones Reopeningbuilding stonequarries Developments in stone consolidants Thenew lime revival Inspectingfibrousplaster ceilings No154May2018 InstituteofHistoricBuildingConservation Cover: This issue of Context focuses on current issues concerning the conservation of masonry structures. C O N T E X T 1 5 4 : M A Y 2 0 1 8 1 2 Briefing 5 Out of Context 5 Writer’s voice 6 Periodically 8 Letters 9 Listed building consent: demolition, or alteration? Eleni Makri and Bob Kindred 13 Working with lime and stone 14 Finding stone Clara Willett and Chris Wood 17 Sourcing stone to repair Exeter Cathedral Emily Harper and Sue Penaluna 20 Progress with stone consolidants David Odgers 23 Lime mortars: a conservation engineer’s view Michael Beare and James Miller 26 Mortar analysis for specifiers Jessica Hunnisett 30 Hot-mixed mortars: the new lime revival Alison Henry 34 Inspecting historic fibrous plaster ceilings John Stewart 39 The revolution that lasted Timothy Cantell 42 The wringing of hands Andrew Vines 44 Local listing using Placecheck Barry Sellers 46 Notes from the chair 48 Director’s cut 50 New members 51 New member profile 52 Vox pop 53 Book reviews 57 Products and services 60 Advertisers index