Transcript Limelite CPD Presentation

Limelite CPD
Presentation
Version 2.0, March 2013
The use of Lightweight
Cement/Lime-based Plasters
for the renovation of
Traditionally Built Properties.
Limelite CPD
Limelite
Presentation
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]
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1. A Brief History of Plaster in the UK
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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
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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
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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
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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.
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2. Problems with Gypsum Plaster
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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.
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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
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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
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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.
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Flooding
 Flooding is becoming an annual occurrence in the UK
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Mould Growth
Mould Growth is a
regular occurrence in
older properties
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3. Repairing Damaged Plaster
with Traditional Gypsum Plasters
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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.
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Repairing Damaged Plaster - Traditional Methods
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
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4. The Solution
Cement and Lime Based Renovating Plasters
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The Solution?
A Lightweight Lime/Cement Renovating Plaster
 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
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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.
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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
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5. Key Features
of Cement/Lime Renovating Plasters
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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.
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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.
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Cement/Lime Renovating Plaster – Key Features
Fibre Reinforcement

Synthetic fibres increase
the cohesive characteristics
of Renovating Plaster to
reduce crazing & cracking
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Cement/Lime Renovating Plaster – Key Features
Insulating Properties

Renovating Plasters contain
lightweight Perlite, which improves
the insulation properties of the
wall.

Thermal Conductivity
K Value = 0.13 W/mºC
(three times lower than gypsum)
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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
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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.
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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.
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6. Application
of Cement/Lime Renovating Plasters
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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.
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Cement/Lime Renovating Plaster – Application
Brickwork

Can be applied directly onto brick
walls
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Cement/Lime Renovating Plaster – Application
Blockwork

Apply a bonding or
sealing agent to the block
work first to equalise the
porosity.
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Cement/Lime Renovating Plaster – Application
Stone Work (low suction)

Add Styrene Butadiene
Rubber (SBR) to initial coat
for improved adhesion on
stonework.
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Cement/Lime Renovating Plaster – Application
Wattle, Daub and Lath
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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.
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7. Areas of use
for Cement/Lime Renovating Plasters
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Cement/Lime Renovating Plaster – Areas of Use
Historic
and
Listed
Buildings
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Cement/Lime Renovating Plaster – Areas of Use
Barn
Conversions
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Cement/Lime Renovating Plaster – Areas of Use
Private and
Rental Housing
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Cement/Lime Renovating Plaster – Areas of Use
Churches
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8. CPD Certificate Assessment
for Cement/Lime Renovating Plasters
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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?
All fields are required
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Yes/No
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
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9. Considerations for Specifiers
for Cement/Lime Renovating Plasters
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Considerations for Specifiers – Quality & Service
The leading Lightweight Lime-Cement Renovating Plaster
Limelite Renovating Plaster
from 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.
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Considerations for Specifiers - Standards
Limelite Renovating Plaster
Certifications/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.
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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]
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Call: 08444 630046