Womersleys Insulating Lime Render Plaster and Moisture Buffering

Womersleys Insulating Lime Render made by Cornerstone is designed to reduce heat loss in solid walls.

The Insulating Render is designed to improve the thermal performance of solid walled masonry, whilst maintaining the high vapour permeability and low strength of an NHL2 render. Insulating Render offers a viable solution for Part L1B legislation in that it meets the requirements for improving the thermal performance of a wall, whilst maintaining a permeable fabric which absorbs and readily allows for the evaporation of moisture and will not prejudice the character of the host building or increase the risk of long term deterioration of the building fabric or fittings. A 50mm application, applied as two coats, will reduce heat loss in a solid wall by 60%.

Most available lightweight/insulating materials use aggregates that have a two-dimensional structure, when these are subject to pressure during application the aggregate can breakdown, reducing both the thermal performance and durability of the mortar. Womersleys Insulating Render uses a specialist recycled ultra-lightweight hardened aggregate with a three-dimensional structure, which does not breakdown under application and improves both the durability and insulating properties of the render.

Fibre additions negate the need for any mesh to be applied to the wall or inserted within the render and improves the flexural strength of the render, distributing stresses across the render to help reduce point loading.

Insulating Render can also be used in sustainable construction projects as a basecoat onto natural building materials such as hemp, straw and rammed earth. The insulating properties help reduce the thermal expansion differentials between the background and any subsequent coatings.

The manufacturers have been working with Loughborough Uni and they have confirmed from initial calculations that a 50mm coating will reduce heat loss by 60%, and they are now proceeding with additional testing for measurements to give us more results.  They have also confirmed that the moisture buffering is substantially increased so the Insulating Lime Render / Plaster will act as a dehumidifier and take in excess moisture if relative humidity is too high within the room.

Similar to conventional lime renders/plasters but due to the fact that the glass aggregate is non-porous it releases the moisture much faster than standard lime coats so the wall be far less prone to condensation. They compared the Insulating Render to conventional EPS insulation, with EPS the relative humidity was at or above 95% for 38 weeks of the year and over 99% relative humidity for 25 weeks during this period, at 95% interstitial condensation will form. So with a standard insulating board the wall would be damp for 38 weeks and have little means to release this moisture/water. With the Insulating Render the relative humidity reached 95% for 8 to 10 weeks but because the render is fully vapour permeable it was able to store and release this moisture when the relative humidity dropped. So we are finding that the Insulating Render is drying the wall much faster than conventional lime render/plaster and still insulating the internal environment.

As its lightweight you can go on up to 30mm per coat and its already got fibres in the mix so no need for mesh. Drying times are similar to that of normal lime, so you can build up to a 50mm coating either green on green or after 3 to 4 days so again it’s a much faster application, you are essentially doubling the amount you can apply at any one time so works out as twice as fast.

Go back

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