Limelite CPD Presentation

Limelite CPD Presentation

Version 3.0 Jan 2014


The use of LightweightCement/Lime-based Plastersfor the renovation ofTraditionally Built Properties.


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]

mailto:[email protected]


1. A Brief History of Plaster in the UK


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


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


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


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.


2. Problems with Gypsum Plaster


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.


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


Problems with Gypsum Plaster - Damp

In damp conditions Gypsum Plaster is susceptible to rising mould growth


Problems with Gypsum Plaster - Metal

Corrosion of Angle Beads, Conduits and other Metal Work is common


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


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.


Flooding is becoming an annual occurrence in the UK

Flooding


Mould Growth is a regular occurrence in older properties

Mould Growth


3. Repairing Damaged Plaster

with Traditional Gypsum Plasters


Repairing Damaged Plaster - Traditional Methods

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.


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


4. The Solution

Cement and Lime Based Renovating Plasters


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


Repairing Damaged Plaster – Cement/Lime Plaster

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

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


5. Key Features

of Cement/Lime Renovating Plasters


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.



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.



Fibre Reinforcement

Synthetic fibres increase the cohesive characteristics of Renovating Plaster to reduce crazing & cracking



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)



Increased Thermal Efficiency

Warmer walls mean reduced condensation on the internal surface

Lower heating bills

Walls are warmer to the touch



Corrosion Resistance

The alkalinity of cement & lime in Renovating Plasters inhibits rusting of metal works such as angle beads, conduits, etc.



Inhibits Mould Growth

The aseptic nature of lime severely retards mould growth.

Alkalinity of lime arrests propagation of mould spores.


6. Application

of Cement/Lime Renovating Plasters


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.



Brickwork

Can be applied directly onto brick walls



Blockwork

Apply a bonding or sealing agent to the block work first to equalise the porosity.



Stone Work (low suction)

Add Styrene Butadiene Rubber (SBR) to initial coat for improved adhesion on stonework.



Wattle, Daub and Lath



Replacement DPCs

Renovating Plasters can be applied to damp walls.

Ideal for application after insertion of replacement DPCs following flooding.


7. Areas of use

for Cement/Lime Renovating Plasters


Cement/Lime Renovating Plaster – Areas of Use

Historic

and

Listed

Buildings



Barn

Conversions



Private and

Rental Housing



Churches


8. CPD Certificate Assessment



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

mailto:[email protected]


CPD Certificate Assessment - Questions1. 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


9. Considerations for Specifiers



Considerations for Specifiers – Quality & Service

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 - Standards

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.


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 630 046

http://www.pozament.co.uk/limelite

Limelite CPD Presentation

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