Limelite CPD Presentation
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Transcript of Limelite CPD Presentation
Limelite CPD Presentation
Version 2.0, March 2013
Limelite CPD Presentation
The use of LightweightCement/Lime-based Plastersfor the renovation ofTraditionally Built Properties.
Limelite CPD Presentation
Limelite CPD Presentation
Objectives
To provide the audience with an understanding of:
1. A brief history of plaster in the UK
2. Problems associated with traditional Gypsum plasters
3. Repairing damaged gypsum plasters
4. The Solution - Lightweight lime-cement renovating plaster, such as Limelite Renovating Plaster
5. Key features of lime-cement renovating plasters
6. The application of Limelite Renovating Plaster
7. Areas of use
8. CPD Assessment & Certification
9. Considerations
How to get your CPD Certificate?
Answer the questions at the end of the presentation and send them along with your contact details to [email protected]
Limelite CPD Presentation
1. A Brief History of Plaster in the UK
Limelite CPD Presentation
A Brief History of Plaster - Origins
Plastering has its origins going back 4000 years to the Ancient Egyptians when it was discovered that they used gypsum plaster and canvas to encase their mummies.
The Romans came up with a hydraulic lime plaster and discovered that adding volcanic ash (Pozzuolana) they had inadvertently discovered concrete. The ash was discovered at Pozzuoli close to Naples, from which it obtained it’s name.
Image: Hostas, 2010
Limelite CPD Presentation
A Brief History of Plaster - Origins
In 1212 King John of England issued a law that all remaining houses in London should be plastered following the fire on the old London Bridge. The first example of Fire Protection.
In 1665 (The Great Plague) King Charles 2nd decreed that all domestic dwellings will be plastered internally with a lime based plaster to kill the bugs
Image: London Tourist, 2012
Limelite CPD Presentation
A Brief History of Plaster - The 19th Century
In 1824 Joseph Aspdin a Leeds Stone Mason developed an early version of Portland Cement replacing the use of Hydraulic Lime.
The use of a 1:1:6 blend with horse hair and timber lath became widespread
Image: Ben Dalton, Leeds UK, 2010
Limelite CPD Presentation
A Brief History of Plaster - The 20th Century
The 1930’s saw the introduction of Gypsum based plasters in the UK.
Shortly after this a more modern lightweight plaster was developed replacing sand with vermiculite.
In the 1960’s Gypsum plaster was
widely adopted due to quicker setting time, replacing 1:1:6.
Limelite CPD Presentation
2. Problems with Gypsum Plaster
Limelite CPD Presentation
Problems with Gypsum Plaster
There are common issues when using Gypsum Plasters:
Slower drying times resulting in delayed decoration.
Salts and mould appeared on surface in older “damp” properties.
Rusting of metal work such as angle beads and conduits etc was experienced.
The hygroscopic nature of Gypsum leads to complete failure when exposed to moisture. Gypsum plaster is not vapour permeable.
Limelite CPD Presentation
Problems with Gypsum Plaster - Flood Damage
Gypsum plasters offer almost no resistance to flood damage
- Floodwater degrades gypsum plasters and causes delamination
- Up to 1 metre above floor level is typically the worst affected area.
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Problems with Gypsum Plaster - Damp
In damp conditions Gypsum Plaster is susceptible to rising mould growth
Limelite CPD Presentation
Problems with Gypsum Plaster - Metal
Corrosion of Angle Beads, Conduits and other Metal Work is common
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Problems with Gypsum Plaster - Consequences
The repercussions can be extremely costly and time consuming
Local Authorities and house owners are inundated with complaints- forcing them to change back to a cement/lime based plaster that was
still traditionally site batched
But site batching creates it’s own set of problems
Limelite CPD Presentation
Site Batching
There are a number of problems caused by site batching:
Multi-point responsibility for quality.
Components are liable to contamination from the site environment.
Much higher risk of wastage.
Variability in quality due to inconsistent batching and raw material selection.
Limelite CPD Presentation
Flooding is becoming an annual occurrence in the UK
Flooding
Limelite CPD Presentation
Mould Growth is a regular occurrence in older properties
Mould Growth
Limelite CPD Presentation
3. Repairing Damaged Plaster
with Traditional Gypsum Plasters
Limelite CPD Presentation
The Process:
1. Hack off the damaged plaster
2. Treat wall with an injected Damp Proof Course (DPC) if required
3. Wait for substrate to dry it usually dries at a rate of 25mm per month.
4. Re-plaster when dry.
Repairing Damaged Plaster - Traditional Methods
Limelite CPD Presentation
There are common problems with the traditional methods:
It can be many months before the wall is dry enough to re-plaster, leading to increased project time and customer inconvenience.
Risk of salts passing through newly applied gypsum plaster, creating efflorescence.
Gypsum will break down again if problem returns or persists.- In properties/areas liable to damp or flooding, it is simply not a long term solution
Repairing Damaged Plaster - Traditional Methods
Limelite CPD Presentation
4. The Solution
Cement and Lime Based Renovating Plasters
Limelite CPD Presentation
The Solution?
Sand was replaced with Expanded Perlite to create modern lightweight version of Cement/Lime plaster with Synthetic Fibres added to reduce shrinkage cracking.
A Waterproofing Agent and Salt Inhibitor were added to replace the “hit and miss” of site batching.
Lime-Cement Renovating Plaster was created
A Lightweight Lime/Cement Renovating Plaster
Limelite CPD Presentation
The new process:
Hack off the damaged plaster
Treat with an injected Damp Proof Course (DPC) if required
Plaster with Lightweight Cement/Lime based Renovating Plaster.
Paint with water based emulsion.
Repairing Damaged Plaster – Cement/Lime Plaster
Limelite CPD Presentation
The benefits of using a renovating plaster instead:
Earlier decoration- no long waits for the wall to dry to apply the plaster- plaster dries faster than gypsum
No repeat problems- Greatly reducing the risk of salting, efflorescence and mould growth.
A permanent solution- A plaster that can withstand recurring water ingress
Repairing Damaged Plaster – Cement/Lime Plaster
Limelite CPD Presentation
5. Key Features
of Cement/Lime Renovating Plasters
Limelite CPD Presentation
Cement/Lime Renovating Plaster – Key Features
Breathability
Lightweight Cement/Lime-based Plasters effectively control dampness passing through walls and provide a barrier against salt transfer.
Being ‘breathable’ means that the plaster…
- allows balanced moisture movement through the construction fabric.
- allows the substrate to dry naturally.
Limelite CPD Presentation
Cement/Lime Renovating Plaster – Key Features
Drying Time
Due to cement content in Lightweight Renovating Plasters, drying time is faster than with gypsum based plasters.
As a result project times are reduced.
Limelite CPD Presentation
Cement/Lime Renovating Plaster – Key Features
Fibre Reinforcement
Synthetic fibres increase the cohesive characteristics of Renovating Plaster to reduce crazing & cracking
Limelite CPD Presentation
Cement/Lime Renovating Plaster – Key Features
Insulating Properties
Renovating Plasters contain lightweight Perlite, which improves the insulation properties of the wall.
Thermal ConductivityK Value = 0.13 W/mºC(three times lower than gypsum)
Limelite CPD Presentation
Cement/Lime Renovating Plaster – Key Features
Increased Thermal Efficiency
Warmer walls mean reduced condensation on the internal surface
Lower heating bills
Walls are warmer to the touch
Limelite CPD Presentation
Cement/Lime Renovating Plaster – Key Features
Corrosion Resistance
The alkalinity of cement & lime in Renovating Plasters inhibits rusting of metal works such as angle beads, conduits, etc.
Limelite CPD Presentation
Cement/Lime Renovating Plaster – Key Features
Inhibits Mould Growth
The aseptic nature of lime severely retards mould growth.
Alkalinity of lime arrests propagation of mould spores.
Limelite CPD Presentation
6. Application
of Cement/Lime Renovating Plasters
Limelite CPD Presentation
Cement/Lime Renovating Plaster – Application
No new methods are required
Lightweight Cement/Lime based plasters are applied in the same way as gypsum based plasters.
Can be applied to most sound mineral substrates.
Limelite CPD Presentation
Brickwork
Can be applied directly onto brick walls
Cement/Lime Renovating Plaster – Application
Limelite CPD Presentation
Cement/Lime Renovating Plaster – Application
Blockwork
Apply a bonding or sealing agent to the block work first to equalise the porosity.
Limelite CPD Presentation
Stone Work (low suction)
Add Styrene Butadiene Rubber (SBR) to initial coat for improved adhesion on stonework.
Cement/Lime Renovating Plaster – Application
Limelite CPD Presentation
Cement/Lime Renovating Plaster – Application
Wattle, Daub and Lath
Limelite CPD Presentation
Cement/Lime Renovating Plaster – Application
Replacement DPCs
Renovating Plasters can be applied to damp walls.
Ideal for application after insertion of replacement DPCs following flooding.
Limelite CPD Presentation
7. Areas of use
for Cement/Lime Renovating Plasters
Limelite CPD Presentation
Cement/Lime Renovating Plaster – Areas of Use
Historic
and
Listed
Buildings
Limelite CPD Presentation
Cement/Lime Renovating Plaster – Areas of Use
Barn
Conversions
Limelite CPD Presentation
Cement/Lime Renovating Plaster – Areas of Use
Private and
Rental Housing
Limelite CPD Presentation
Cement/Lime Renovating Plaster – Areas of Use
Churches
Limelite CPD Presentation
8. CPD Certificate Assessment
for Cement/Lime Renovating Plasters
Limelite CPD Presentation
CPD Certificate Assessment - Details
Please complete the following details and send them in an email to [email protected] along with your answers to the questions on the following slide. Upon the receipt of correct answers we will issue a CPD certificate.
Full Name:Company:Job Title:Address Line 1:Line Address 2:Address Line 3:Address Line 4:Postcode:Phone:Email Address:
Would you be happy to receive future information on Limelite Products? Yes/No
All fields are required
Limelite CPD Presentation
CPD Certificate Assessment - Questions
1. Name 3 common problems associated with Gypsum based plasters
2. Other than faster drying times, what else makes the process of repairing damaged plaster on damp walls quicker with a Cement-Lime Renovating Plaster compared with using a Gypsum Plaster?
3. Name 3 key features of Cement-Lime Renovating Plaster
4. Cement-Lime Renovating Plaster can be applied in the same manner as traditional Gypsum based plasters…
Please choose: True / False
Limelite CPD Presentation
9. Considerations for Specifiers
for Cement/Lime Renovating Plasters
Limelite CPD Presentation
The leading Lightweight Lime-Cement Renovating Plaster
Limelite Renovating Plasterfrom Tarmac Building Products Ltd
Cementitious Expertise – Limelite Renovating Plaster is managed by Tarmac’s specialist cementitious solutions division, called Pozament.
Proven track record – system used for over 30 years.
Network of Nationwide stockists – ease of supply.
Technical support – experts at a nationally recognised company.
Consistent Quality Guaranteed – Factory-produced, pre-blended, bagged product ensures that risks associated with site batching are eliminated.
Considerations for Specifiers – Quality & Service
Limelite CPD Presentation
Limelite Renovating PlasterCertifications/Accreditations
British Board of Agrèment (BBA) Approved for use after the installation of a DPC.
Environmental Certification to BS EN ISO 14001.
Manufactured in accordance with BS EN ISO 9001:2008 certified procedures.
Considerations for Specifiers - Standards
Limelite CPD Presentation
Any Questions?
Thank you for your time.
…do you have any questions?
Further information can be found on the Tarmac Pozament website:
www.pozament.co.uk/limelite
or alternatively
Email: [email protected] Call: 08444 630046