Natural Pozzolana described by Vitruvius in the Roman Era

Vitruvius writing The Ten Books of Architecture in 27BCE reminds us that natural and manmade pozzolana has been used to improve fat lime mortars for a long time.

He states that: ‘using river sand or sea sand with the addition of a third of a part composed of burnt brick, pounded up and sifted, will make your (slaked lime based) mortar of a better composition to use’ ; and ‘that a powder (fired clay sub soils).. found in the neighbourhood of Baiae and in the country belonging to towns around Mount Vesuvius… when mixed with lime and rubble not only lends strength to buildings but will set under water’

It is important to remember that a wide variety of lime mortars have been used in the past and we should embrace the use of all mortars but pick carefully the most appropriate strength lime mortar for the work being undertaken.

Weak and friable stonework might benefit from a weak hot lime mix whereas a moderately hydraulic lime mortar either made from a hydraulic lime or by mixing brick dust or a natural pozzolana as Vitruvius describes would be suitable for denser brickwork.

Womersleys will always advise you on the most appropriate strength lime mortar to use in any conservation or renovation work that you are involved with.

Joseph Wright of Derby, ‘Vesuvius in Eruption, with a View over the Islands in the Bay of Naples’ c.1776–80

 Vesuvius in Eruption, with a View over the Islands in the Bay of Naples c.1776–80

by Joseph Wright of Derby (3 September 1734 – 29 August 1797)

 

Red Brick Dust and Pozzolanas

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2018
Day 6: Promoting Tourism through Conserving Heritage Conference Final day in Ethiopia Conservation Management Plans and Goodbye Day 4 Lime Training in Ethiopia Day 5 Lime Training in Ethiopia Day 3 Training in Ethiopia Day 2 of Lime Training in Ethiopia Empress Mentewab's Kuskuam Complex Lime Training in the Royal Compound at Gonder Day 1 of Running Lime Training in Ethiopia Conservation at Guzara Palace Earth mortars and Northern Ethiopia Inspirational Wattle and Daub in Ethiopia Providing Lime Training Out of the Rain An introduction to Silicate Paints Natural Pozzolana described by Vitruvius in the Roman Era Faux Marbling and Traditional Paints Training test Spenfield House Decoration Inspires Training Day Training at the Jewellery Quarter Birmingham Lime render finish coats for innovative design Paint Stripping Samples for Wythenshaw Hall A refresher day on Hot Limes for Mono Masonry Cast Roman Cement from 1840 on a building in Liverpool The colour is great and lots of very positive comments Fiona's Sheep formed from Womersleys Stone Repair Traditional Stand Oil Paint on new garden gate Tithe Barn now finished after Womersleys supply foamed glass insulated floor Ryedale Plasterers honing their skills & techniques Stone and Brick Repairs We would love to see you at Harrogate free tickets are available here Womersleys Insulating Lime Render Plaster and Moisture Buffering New Wattle and Daub supplied by Womersleys Ordsall Chord is coming to a successful finish Oil Paints and Distempers used to create an Illusion The iron rich limestone and aggregates of south east Sicily Marbeleizing with Natural Oil Paints Lime Mortars have always had to with stand extreme weather and seas The Cathedral Church of Saint Nicolo presents a fine Baroque façade The beautiful Noto limestone cladding Noto's Baroque Buildings Beautifully weathered lime render Lime stucco repairs to capitals Brick and Stone Formwork Exposed behind Lime Stucco Render Historic Lime Kiln at Shap Lime Stucco Work by Giovanni Bagutti Plaster, Daub and Render Survey at Old Hall Farm Repairing clay daub and lime plaster on panels of riven lath and insulating externally with insulated lime renders Use of mobile elevated platforms in Theatres Creating Formwork and Constructing an Arch An introduction to Lead Work Training Day Working with volunteers on the Chesterfield Canal Helping the Canal and River Trust Volunteers Training Course Sicily Building Kiln Training Course Sicily: Chuch of San Nicola Womersleys training course Sicily It really is as beautiful as they say Traditional buidling techniques Garden Corner Tower circa 1650, Agra Living Heritage Real Market Places Fine polished lime plaster ensured opulent splendour Indian Mortar Mill India Gate Lotus Flower forming 17th Century Column Bases Seventeenth Century Chrysanthemum Detail The Lotus Flower and the Indian Flag 17th Century Lime Stucco on brick Seventeenth Century Indian Frescoed Lime Stucco RIBA accredited CPD paint seminars Ceiling Survey Reveals a Glimpse of Former Decorative Glory Clay Infill found in Exeter's Grand Royal Clarence Hotel Foamit Sub Base for Great Tythe Barn
2016
Get your free tickets for the National Home Building Show Understanding Marple Lime Kilns It would be good to see you Sensitive refurb planned for Forge Cottage Last of Five Days at Grand Designs promoting Womersleys Stabilising a boundary wall with Hydraulic Hot Lime Mortar Its nice to be appreciated Training with Help the Heroes Volunteers The historical development of a simple wall Trialling hot lime mortar Lime Mortar Training Yesterday at Womersley's Breathable and natural paints for Lighthouse Aglaia emulsions used at St Leonard's Latest build by Guy and Straw Works Ltd Advice on Breathable Insulation for a Windmill More Lime Wash for West Wycombe Park Our latest article in the Listed Heritage Magazine Toft Gate Lime Kiln in Nidderdale The whole is greater than the sum of its parts What a pleasure to be booked in to resurvey the Apollo Tim's Nidderdale Dream Womersleys helping with Conservation Skills Training Programme Lovely Chamfers Working with our German Paint Partners The Ceiling Centre Tells a Story Historic Mortar Analysis for North Bar, Beverley New Foamed Glass Sub Base for Beamish Park Gardens Refurbishment Plasterwork survey at Oakwell Hall Completed Please call in to see us if you are at the Great Yorkshire Show Renovation in the Prettiest Village in the County Offering Paint Advice at Holy Trinity Church, Hull Developing Thornton's Conservation Area Assessment to Guide Develeopment Talbot Yard Malton Wins Award Insulating an Old Building with the Internal Warmshell System The Hairy Builder (Biker) Promo Traditional and Natural Paints featured in LPOC magazine Results of Plaster Survey at Wythenshaw Hall following fire damage New pre mixed Ironstone mortars introduced Results of Plaster Analysis at Castle Dairy Kendal Womersleys continue to supply lime mortars to Pontefract Castle Plaster Survey at Wythenshaw Hall following fire damage Holy Trinity Church Sunderland Plaster Survey Investigations in to the condition of the plaster on the walls at the Exchequer Building, Palace Green Library, Durham Plaster Analysis at Castle Dairy Kendal Free Illustrated Case Studies detailing Insulated Floors for Old Buildings