Glasu are also supporting a day for the farming community in Powys on caring for traditional stone barns and outbuildings on Friday 10th September – contact us for further information.
Churches Conservation Trust
Eggsellent! We are over three-quarters of the way through delivering a three year training programme for the Twyi Afon Yr Oesoedd project – a project led by Carmarthenshire County Council, with funding from the Heritage Lottery Fund, the Rural Development Plan and support from the Countryside Council for Wales, Menter Bro Dinefwr and the National Trust. ˆ at the newly converted Training Centre in Llandeilo has included Training delivered by Ty-Mawr lime in building, lime plastering, specifying lime, energy efficiency and paint days. Course delegates on the paint day explored a wide range of traditional and natural paints all compatible with breathing buildings including limewash, soft distemper, silicate paints and the range of eco-paints (chemical, plant-based and mineral) currently available on the market. They finished the day by making some truly natural paints – glair from egg white and pigment from mint (turned bright purple!) and egg tempera from the egg yolk with yellow ochre pigment! Thank you ˆ eggs! Henry for the organic, free-range Ty-Mawr The Energy Efficiency Day in Old Buildings attracted a great deal of attention including from ˆ said “1 in 4 homes in the UK are built of solid wall BBC Radio Wales – Nigel Gervis, Ty-Mawr construction, it is estimated that around 45% of the heat loss in these buildings is through these un-insulated walls. The day therefore focussed on the technical aspects as well as the practical implications of various natural plaster, board and insulation systems that do actually maintain the breathability as well as reducing the energy consumption and hence environmental impact of running these buildings”.
Ty-Mawr ˆ were pleased to be part of a large gathering at Lancing College, West Sussex for the Churches Conservation Trust. Nigel Gervis presented the Ty-Mawr ˆ limecrete flooring system along with Louise Rendall, RIBA architect for St Ann's Gate Architects based in Salisbury. She presented a case study of the flooring system being installed in The Priory Church of St Mary and St Blaise, Boxgrove near Chichester. The building dates from the early twelfth century, major restoration work including the installation of the limecrete floor was completed in November last year. For a photographic record of the restoration work, see www.boxgrovepriory.co.uk Flagstones
Edge Insulation
Tˆy-Mawr Bedding Mortar The glaster® Screed
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deep grey
stone green
brick pink
yellow ochre
deep orange
Which Lime? At T yˆ -Mawr, we manufacture fat (nonhydraulic) lime plasters and mortars and we stock and sell both the Singleton Birch as well as the Castle hydraulic limes. We are often asked why we have such a wide range of limes, quite simply there is no one lime product that suits all! For anyone who has been on one of our courses or spoken to one of us, they will probably have heard “the specification should come from the building”, it is the needs of the building that should be considered first and foremost not what’s
Impurities which affect setting properties
Breather Membrane The Insulating Layer/ Hardcore
Further courses are planned for the autumn – email mike.scruby@lime.org.uk for details. Not to scale
Levelled & Compacted Ground
Courtesy: CADW and Capps and Capps Lime Hemp repairs at Tretower Court.
available on the shelf or what the builder/plasterer is use to, the trade-offs have to be understood – see graph below. The quicker, harder setting limes have become increasingly popular, they are seen as easier to use or as giving a ‘more guaranteed’ result and there are situations where they are invaluable. However, consideration should be given to the longer term implications when used on/in old buildings both in terms of reduced breathability and flexibility. Examples like the rebuilding of St Teilo’s 13th Century Church at St Fagan’s entirely with fat lime mortars has done much to rebuild confidence in the ‘strength’ of the ‘weaker’ limes! As well as technical performance criteria, we also consider the environmental footprint of all of our products, where we can, we support local and British products (hence minimising the road miles and supporting the local
Moderately Hydraulic NHL3.5
Eminently Hydraulic NHL5 (Z)
Portland Cement
Negligible
Under 12% natural active clay minerals
12 - 18% natural active clay minerals
18 - 25% natural active clay minerals
Artificial mix of limestone plus clay/slag >50%
Vapour Permeability (ng/Pa.s.m) Strong, rapid set poor permeability Soft, slower set good permeability
Set in water (days) 0.5
A IN ABL ST
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While every effort is made to ensure the accuracy of colour, due to the limitations in the print process variations may occur. Call us for a sample to be sure.
Feebly Hydraulic NHL2
Strength (N/mm≤)
R
For more information download our lime hemp leaflet from our website or call us for a copy – 01874 611350.
Pure/Air Fat Lime Putty
The Limecrete Slab
Breather Membrane
© Ty-Mawr ˆ Lime Ltd 2010
pale grey
Type of lime / binder
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Cronfa Amaethyddol Ewrop ar gyfer Datblygu Gwledig: Ewrop yn Buddsoddi mewn Ardaloedd Gwledig The European Agricultural Fund for Rural Development: Europe Investing in Rural Areas
burnt umber
AB
“A superb day. Very informative and talks delivered with great knowledge. I've fallen in love with lime!!”
cream
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ABLE • S
Alan Jones, Master Thatcher, Pembrokeshire Thatch and Carpentry will be demonstrating traditional thatching techniques using local Welsh straw.
PLASTER
natural
PLA
economy). Having lost the last hydraulic lime product in the UK in 2003, we welcomed the Singleton Birch range of products. Darren Scutt, Singleton Birch said “We have been quarrying Lincolnshire chalk for nearly 200 years; today, we produce up to 400,000 tonnes of lime per annum. Whilst undertaking market research into potential production of a British range of hydraulic limes, we quickly became aware of the general consensus that the hydraulic limes available on the market were in many cases stronger than was required. Bearing this in mind Singleton Birch limes are designed to fit at the lower end of each of the NHL categories which are seen as being more appropriate for old buildings. We are pleased to be manufacturing the full range of hydraulic limes in the UK and to be working ˆ who are able to with companies like Ty-Mawr expertly support the products on the ground!”. The good news is that we have a wide range limes now, the bad news is that we have a ˆ we wide range of limes now, but at Ty-Mawr are absolutely committed to supporting our clients in making the right choices for the building and the environment, hence our investment in more Product Advisers (see page 4), and in the production of our Lime Handbook, NBS specification clauses, technical sheets and the website. Did you know? – around 10% of all UK energy consumption is in the production and transportation of our building products!
Hours
For the latest news, case studies, product list, descriptions, current prices, application guides, technical sheets, NBS clauses, quantity calculators and full electronic shopping – visit our new website www.lime.org.uk
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We were particularly pleased to have over 30 delegates attend our Caring for Churches and Chapels day in June funded by GLASU – the European Leader programme in Powys. As well as hearing talks on lime in building, caring for buildings from the architects point of view and from the contractors point of view, the group also visited Llanywern Church and Pennorth Chapel to look at how to deal with some of the more common issues and problems caused by using inappropriate materials.
We look forward to welcoming them and will have more news in the autumn issue - to be sure of your copy register with www.lime.org.uk
Nigel Gervis, Operations Director said “we have received more and more interest in producing a premixed self-coloured plaster range; it is popular because of the obvious labour saving benefits on-site – as there is no gauging of components which reduces inaccuracies, it also makes for a cleaner site and ultimately there is no requirement to paint it. It is particularly attractive with the recycled glass aggregate, although if you do not wish to see the glass then that finish can be achieved too”. N O VATIV IN Tyˆ -Maw r
N O VA • IN T Tyˆ -M aw r
We receive more emails and positive feedback about our lime hemp plaster than any other product! Increasingly plasterers as well as conservation architects and organisations are recognising the merits in using a product that behaves in the same way as traditional lime plaster in terms of its breathability, but benefits from the added strength, flexibility and thermal qualities of the hemp fibres. Because the fibres also retain moisture fewer and thicker coats can be applied, it is therefore having a significant impact on reducing labour costs. The most popular application though has been lime hemp plaster onto our wood wool boards for ceilings or timber frame infills.
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Training contractors for specific sites is getting increasingly popular with days delivered in Kent as well as North and West Wales in the last few weeks alone with more planned.
30 participants will spend the week at Ty-Mawr ˆ Training Centre working alongside thatchers, lime plasterers, timber framers and dry stone wallers. The group will be staying in near by Brecon and will also have tours of Brecon Town, evening lectures from Mr Rory Young, Stone Carver and Conservator and Ned Scharer who has recently completed a 21/2 year conservation project in Westminster Abbey.
We will be launching our new range of nine self-coloured finishes in our glaster® plaster range at the Royal Welsh Show in July.
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Our work has continued over the last quarter in spreading the word and sharing the skills. Courses at Ty-Mawr ˆ have again been full with additional days being added to our programme of events (see page 4) Training days have also been run for Shepton Mallet THI scheme and the Overlooking The Wye project. We have also delivered Lime CPDs in Derbyshire, Manchester, Chester and several in London, as well as delivering talks at the SPAB Insulating Plasters day and demonstrations and talks at the IHBC event in Shropshire.
Following the visit to Ty-Mawr ˆ last summer by Their Royal Highnesses, The Prince of Wales and The Duchess of Cornwall, we are delighted to be hosting one week of the three week long Summer School for the Prince’s Foundation for the Built Environment.
Hemptastic!
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School Spreading the word, Summer at T y-Mawr ˆ sharing the skills
Product Update Self-Coloured glaster !
TH
Training Update