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T y-Mawrecological building productsdeunyddiau adeiladu ecolegol
lime plaster made with recycled glass for external & internal use
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T y-Mawr2
BackgroundIn 1993 Nigel and Joyce Gervis, founders
and directors of T y-Mawr Lime, purchased
T y-Mawr, a run-down farm in the heart of
the Brecon Beacons National Park. As wellas becoming the couples family home (and
a life-times restoration project!), this listed
property also proved to be the inspiration
for their business T y-Mawr Lime Ltd. The
reason for this is simple. On purchasing the
property, it was Nigel and Joyces intention
to restore the building sympathetically and
in-line with their architectural heritage.
But the couple faced one key problem
they couldnt source appropriate lime
mortars and plasters! The initial solution was
straightforward, using Nigels experience,
they began making their own.
TY-MAWR GRANARIES 1993
A business is bornThe potential for expansion was obvious
and what started off as a temporary solution
for a one off renovation project soon
germinated into a business plan. UtilisingNigels background where he had gained
valuable experience of using lime in the
eighties with Capps and Capps on projects
in London and then Wales and Joyces
experience in IT, project management and
rural development, the couple established
their own business. In 1995, T y-Mawr Lime
Ltd was born.
Originally, the primary focus was the
manufacture of lime-based building
materials for the conservation of old and
historic buildings. Lime mortars, plasters &paints have subsequently been supplied to
some of the most prestigious conservation,
restoration and, more laterally new
construction projects throughout the UK.
Buildings, organisations and projects that
have benefited from T y-Mawr products and
expertise include Aberglasney House, the
National Botanical Gardens, The Landmark
Trust, Dolbelydr, St Teilos Church,
National Museum of Wales and Worcester
Cathedral. T y-Mawr Lime Ltd is still the only
manufacturer of lime based products inWales and this remains the companys core
area of business.
Skills & specificationWhat soon became apparent to Joyce and
Nigel was that, just as UK lime production
had diminished to almost nothing in the
past fifty years, so had the skills andknowledge base required to use such
products.
With calls coming in on almost a daily
basis, asking for advice on product usage
and application techniques, T y-Mawr Lime
Ltd established an education arm and in
1996 began offering courses in the use of
traditional building materials. These courses
have proved to be extremely popular and
now attract delegates from all over the
world.
Tailor-made courses have been designed
and run for a wide range of organisations
including Local Authorities, British
Waterways, the Canals Trust, the National
Trust, and Townscape Heritage Initiatives.
For two years, they hosted and organised
the prestigious Summer School for the
Princes Foundation for the Building
Community with participants from all overthe world.
As well as concentrating on getting the
practical skills right, T y-Mawr Ltd has also
focused heavily on the specification of
traditional building products, so much so
that the company is certified to deliver RIBA
accredited CPD seminars on using lime as a
sustainable material appropriate to todays
world. Such seminars have benefited
private architect practices, Building Control
and other professional groups country-
wide. They have also drafted a wide range
of NBS clauses.
The Company
SUMMER SCHOOL 2010 AT TY-MAWR THE PRINCES FOUNDATION FOR THE BUILDING COMMUNITY
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T y-Mawr3 The Company
Supporting theenvironmentConcern for the environment, particularly
with regards to minimising the impact
of buildings on the environment, quicklybecame an important focus for Nigel and
Joyce. It remains one of T y-Mawr Lime
Ltds core business principles today.
This philosophy is at the heart of the
companys development of a unique range
of environmentally-friendly building materials
compatible with breathing building
principles. The range includes paints
and finishes, building boards including
woodfibre boards, wood wool boards, reed
mats and reed boards, as well as insulation
products made from Welsh sheeps wool,hemp and cellulose (recycled newspaper).
NEW BUILD WITH PIGMENTED GLASTER SITS ALONGSIDE
GRADE II* LISTED BUILDINGS
This dedication to the environment hasmotivated the company to develop
greener alternatives to mainstream
building products. Examples of this are
glaster - a lime plaster made with recycled
glass instead of sand; Lime hemp Plaster,
which uses hemp fibres instead of sand,
and Limecrete, an environmentally-friendly
alternative to concrete.
In 2009, Nigel and Joyce were thrilled
to be named as one of 52 sustainable
development champions on the first
Welsh Green List - a list recognising the
commitment and contribution of individuals
in Wales to the environment!
Back to the buildingT y-Mawr itself is an on-going restoration
project, and provides an excellent example
of how Joyce and Nigel practice what they
preach. As well as being the couples home
and business base, the building is also now
used extensively as a venue for visits from
all sorts of groups concerned with building
and the environment.
As well as demonstrating examples of
T y-Mawr products, the building itself also
incorporates environmental technologies
such as solar thermal, rain-water harvesting
and biomass heating. This has helped
reduce T y-Mawrs carbon dioxide
emissions by up to 40 tonnes per year,
demonstrating that Joyce and Nigel are
just as passionate about minimising their
own impact on the environment as they are
about developing greener building solutions.
Be The Change.... -From Nigel & Joyce Gervis
The lime industry has changed enormously
over the last 18 years. At T y-Mawr, we
have watched, contributed and adapted
to the changes that now sees lime as an
appropriate building material not only for
traditional buildings but also new ecologicalbuildings.
The business has invested heavily in
product development, research, testing,
product accreditation, quality standards,
and custom built computer-controlled,
highly energy efficient manufacturing
machinery, the company has expanded to
a purpose built distribution warehouse and
has built up a team of some 20 members
of skilled staff to ensure the excellent quality
of products and services, that T y-Mawr has
become renowned for, continues as the
business grows.
Building and buildings are one of the
greatest polluters on the planet, one of the
quotes we have used a lot as a business
is that you must be the change you want
to see in the world, we are slowly realising
some of the change we would wish to
see at T y-Mawr and through our work
and product manufacture, feel proud that
we have now supplied over 17,000 other
projects over the last 18 years, hopefully
helping others be the change they wish to
see as well!
TY-MAWRS DISTRIBUTION CENTRE
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T y-Mawr4 Product Development
Product backgroundLime plasters have been used for over
12,000 years; no plaster has performed
better in old, solid wall construction
buildings. Our concern for the environmenthowever, led us to look at improving the
green credentials of this ancient material,
the resulting product was glaster.
GLASTER IS AN EXCITING BLEND OF LIME (BINDER) AND
RECYCLED GLASS (AGGREGATE) TO MAKE PLASTERS,
RENDERS, MORTARS AND SCREEDING FOR FLOORS.
Why Lime?Products are made with lime ideal for use in old buildings as the use of the traditional lime
binder means that they benefit from being vapour permeable (to manage moisture and
hence regulate humidity), are relatively soft allowing the building to continue to move and
flex (which they are designed to do) and can be recycled at the end of their useful life.
A breathing building
SOLID WALL CONSTRUCTION BUILDING - MAINTAINED WITH
SOFT, TRADITIONAL, VAPOUR PERMEABLE MATERIALS.
Sick building
SOLID WALL CONSTRUCTION - REPAIRED WITH HARD,
MODERN IMPERVIOUS MATERIALS POTENTIALLY TRAPPING
MOISTURE AND LEADING TO PROBLEMS SUCH AS DAMP,
CONDENSATION, MOULD GROWTH, WET/DRY ROT ETC.
It is also a perfect choice in more
sustainable new builds where low impact
materials are demanded. It is greener
because it uses a binder that absorbs
carbon dioxide when curing and is burnt at
a lower temperature than cement.
RISING DAMP
DENSE CONCRETE FLOOR
IMPERVIOUS
PLASTER AND OR
IMPERVIOUS PAINT
(TRAPS MOISTURE)
POORLY
MAINTAINED
RAINWATER
GOODS
HARD IMPERVIOUS
RENDER AND OR
PAINT (TRAPS MOISTURE)
RAIN
WATER PENETRATION
THROUGH CRACKS
PAVING
TIMBER LINTEL - WET ROT
POTENTIALLY LEADS
TO CONDENSATION,
MOULD GROWTH
BLOCKED LAND DRAIN
RISING DAMP
VAPOUR PERMEABLEFLOOR
LAND DRAIN
EVAPORATIONOF MOISTURE
GOOD EAVESAND WELLMAINTAINEDRAINWATERGOODS
EVAPORATIONOF MOISTURE
RAIN
LIME MORTARPOINTING
(or lime render withvapour permeablepaint)
EVAPORATIONOF MOISTURE
TIMBER LINTEL
INTERNAL LIME PLASTERWITH VAPOUR PERMEABLE
PAINT
= EQUILIBRIUM
Slaking burnt lime in either:
Heat
i) an excess of water
to produce a putty
or ii) a shortfall of water to
produce a powder (hydrate)
or iii) in damp sand
to produce a hot mix
Slaked lime (putty)
is mixed with selected sands to
produce mortars and plasters, or
with water to produce limewash
Water-born Carbon Dioxide (CO 2) is absorbed
over time to form Calcium Carbonate (CaCO 3)
Limestone from the quarry
Burning limestone in a kiln drives off
CarbonDioxide (CO2)and water(H 2O)
Burnt lime is also known
as quicklime or lumplime
CARBON
AT
ION B
URN
ING
SLAKING
Limestone
Calcium Carbonate
(CaCO3)
Slaking Lime
Calcium Hydroxide
(Ca(OH)2
Burnt Lime
Calcium Oxide
(CaO)
The Lime Cycle
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T y-Mawr5 Product Range
Why Recycled Glass?We chose to use recycled glass because
of the wide environmental benefits of using
it as opposed to sand, benefits include
reducing the extraction of a virgin rawmaterial (160.5 million tonnes are extracted
annually in the UK for construction
purposes, 14.5 million tonnes are marine
dredged) with environmental implications,
it also reduces the volume of waste sent
to landfill and saves the energy and natural
resources required to make new glass.
For every tonne of glass recycled, 30
gallons of oil is saved.
glaster can be used on> most conventional backgrounds including
stone, brick, block, wood wool and
woodfibre boards.
> as a mortar for building or pointing up
stonework, brickwork or blocks.
> externally as a render with a flat or
roughcast finish.
> internally as a plaster which can be
painted, trowelled to a smooth finish or
etched to reveal more glass or as a self
coloured finish.
> as a floor screed.
glaster productsare available in twopremixed ranges> traditional ready-to-use wet premix
manufactured using traditional fat lime putty
and recycled crushed glass.
This product range is ideal for plastering
internally or repairing old buildings where
it is important to maintain the flexibility and
vapour permeability of the building.
It requires mixing, prior to application and is
best used within a month of purchase.
> dry hydraulic premix manufactured
using a moderately hydraulic lime and
recycled glass which is suitable in most
usual conditions e.g. for stone, brick orblock work as a render, plaster or mortar.
This range is supplied as a dry premix to
which water must be added on-site and
then mixed in a mill/site mixer. Silos are also
now available.
glaster plasterIt is available in a coloured range see
page 6 which can be trowelled smooth
or etched to reveal more of the glass
aggregate. Alternatively, it can be paintedwith a vapour permeable paint.
We are also able to tailor-mix specific
colours.
glaster externalroughcastUsing a coarser grade of crushed glass
and by spray applying the product a
unique render finish can quickly be applied
to blockwork, masonry, brick and building
boards. The increased surface area of such
a finish helps the evaporation of moisture,it is therefore an extremely effective finish for
very exposed elevations.
glaster mortarThis mortar is ideal for building or pointing
blockwork, masonry and brick. It is available
as a dry premixed to which water must be
carefully gauged on site.
APPLYING GLASTER TO WOOD WOOL BOARDS.COURTESY: WWW.CO2DL.CO.UK
JOHN CHRISTOPHERS CODE LEVEL 6 HOUSE
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T y-Mawr6 Product Range
glaster screedThis product is perfect for use with our
insulated limecrete floors, compatible with
underfloor heating onto which flagstones,
timber floors (ventilated) or unsealed tilescan be laid. It can be polished to give a
decorative finish.
Coloured range
glaster Plaster Product Selection
Building Material Site Type Suggested Base Coats Suggested Suggested Top Coat -please note the top coat Suggested
Build-up should be softer and thinner than previous coats Build-up
Cob, Rammed Earth, Internal glaster Fat Lime (haired) Plaster 2 x 9mm glaster Fat Lime (unhaired) Plaster 1 x 6mm
Strawbale or glaster Dry Hydraulic Lime Plaster 2 x 9mm(haired base coats) External glaster Dry Hydraulic Lime Plaster 2 x 9mm glaster Dry Hydraulic Lime Plaster 1 x 6mm
Reed Mat, Reed Board Internal glaster Fat Lime (haired) Plaster 2 x 9mm glaster Fat Lime (unhaired) Plaster 1 x 6mm
(haired base coats) or glaster Dry Hydraulic Lime Plaster 2 x 9mm
External n/a n/a
Celenit Wood Wool Internal glaster Fat Lime (unhaired) Plaster 1 x 9mm glaster Fat Lime (unhaired) Plaster 1 x 9mm
Boards or glaster Dry Hydraulic Lime Plaster 1 x 9mm
(mesh base coat) External glaster Dry Hydraulic Lime Plaster 1 x 9mm glaster Dry Hydraulic Lime Plaster 1 x 9mm
Woodfibre Board Internal glaster Fat Lime (unhaired) Plaster 1 x 9mm glaster Fat Lime (unhaired) Plaster 1 x 9mm
(mesh base coat) or glasterDry Hydraulic Lime Plaster 1 x 9mm
External glaster Dry Hydraulic Lime Plaster 1 x 9mm glaster Dry Hydraulic Lime Plaster 1 x 9mm
Lath (internal only), Internal glaster Fat Lime (haired) Plaster 2 x 9mm glaster Fat Lime (unhaired) Plaster 1 x 6mm
Soft Stone External glaster Fat Lime (haired) Plaster 2 x 9mm glaster Fat Lime (unhaired) Plaster 1 x 6mm
or glaster Dry Hydraulic Lime Plaster 2 x 9mm or glaster Dry Hydraulic Lime Plaster 1 x 6mm
Soft Brick Internal glaster
Fat Lime (unhaired) Plaster 2 x 9mm glaster
Fat Lime (unhaired) Plaster 1 x 6mm(mesh base coat) or glaster Dry Hydraulic Lime Plaster 2 x 9mm
External glaster Fat Lime (unhaired) Plaster 2 x 9mm glaster Fat Lime (unhaired) Plaster 1 x 6mm
or glaster Dry Hydraulic Lime Plaster 2 x 9mm or glaster Dry Hydraulic Lime Plaster 1 x 6mm
Hard Stone Internal glaster Dry Hydraulic Lime Plaster 2 x 9mm glaster Dry Hydraulic Lime Plaster 1 x 6mm
(haired base coats) External glaster Dry Hydraulic Lime Plaster 2 x 9mm glaster Fat Lime (unhaired) Plaster 1 x 6mm
Hard Engineering Brick, Internal glaster Dry Hydraulic Lime Plaster 2 x 9mm glaster Dry Hydraulic Lime Plaster 1 x 6mm
Concrete Blocks External glaster Dry Hydraulic Lime Plaster 2 x 9mm glaster Dry Hydraulic Lime Plaster 1 x 6mm
(mesh base coat)
Insulation Blocks* Internal glaster Dry Hydraulic Lime Plaster 1 x 9mm glaster Dry Hydraulic Lime Plaster 1 x 9mm
(haired base coat) External glaster Dry Hydraulic Lime Plaster 1 x 9mm glaster Dry Hydraulic Lime Plaster 1 x 9mm
Dub out uneven surfaces prior to applying first coat. May require more coats due to waviness of bales.*Insulation blocks have very high suction, be careful to control suction.
Available in a coloured range and with different coloured glass, when available.or for a fine finish add Fat Lime Internal Top Coat Plaster, 1 x 3mm coat
CREAM PALE GREY DEEP GREY NATURAL BURNT UMBER YELLOW OCHRESTONE GREEN BRICK PINK DEEP ORANGE
POLISHED GLASTER FLOOR
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T y-Mawr7 Benefits
Health benefitsIt is a highly technical finish, helping to
regulate humidity within the building and
therefore keeping it healthy for those living
and/or working inside the building. We
currently spend approximately 90% of
time indoors, the quality of the air and the
internal environment in paramount in terms
of our health and happiness. This chart
shows the humidity levels at which the listed
microbes and health problems are likely to
flourish. As the width of the bar increases,
indoor air quality diminishes and potential
health problems increase. For example,
virus growth is unsupported at humidity
levels of 50% to 70%, glaster helps to
maintain this optimum, but its growth rates
steadily increase above and below this
range with maximum growth at 0% and
100% relative humidity.
Aesthetics
COURTESY: WWW.PRINTSOFWALES.BIZ
glaster offers a genuinely sustainable
plaster/render that produces a surface
that is unique, giving all sorts of aesthetic
potential by varying pigment colours as
well as aggregate type and colours. It is
also highly suitable for pargetting see
example above.
COURTESY FACIT HOMES
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T y-Mawr8 Case Studies
Flint HouseFamily house in Blackheath, London.
Construction and detail design by Modernarc
Nick Willson Architects
Materials Supplied: Hydraulic glaster render
Photos courtesy Gareth Gardner
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T y-Mawr9 Case Studies
COURTESY: AUSTIN SMITH LORD ARCHITECTS,
A.J.PHILIP PLASTERING
Severn Theatre, ShrewsburyClient: Wilmott Dixon Construction Ltd, A J Phillips Plastering
Materials Supplied: Pigments glaster Yellow Ochre
glaster was chosen to give a durable finish in the foyer at the Severn Theatre, Shrewsbury. The through
colour meant that the plaster did not require painting and gave a lively finish for visitors.glaster is just as suitable for high traffic, commercial environments as well as domestic situations.
NBS Clause
EXTRACT FROM ARCHITECTS DRAWINGS
COURTESY: UPTON CASTLE ESTATE
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T y-Mawr10 Training and Support
To support the products, we spend a great
deal of time raising awareness and assisting
architects in specifying this innovative
material by delivering RIBA accredited
CPDs across the UK. Nigel Gervis, inventor
and Technical Director delivers some 60 ofthese technical seminars per annum to help
build the confidence in the product in order
to encourage architects to specify it for
commercial as well as domestic projects.
NIGEL GERVIS, INVENTOR, DELIVERING CPDS
SPRAY APPLYING GLASTER
We have also developed RIBA approvedNBS (National Building Specification)
clauses to assist architects with choosing
the right products and build-up for the
different substrates based on the table on
page 6.
Practical application of the product requires
some understanding of how it carbonates.
We therefore run practical training day for
contractors at our dedicated training centre
as well as their site when required. For
example, we advised and provided on-site
training for the rendering at The Lime Housein Ebbw Vale, Mission Hall, West Sussex
and John Weavers contractors at Elliott
Colliery and for the Duchy of Cornwall.
LIME HOUSE, EBBW VALE, COURTESY BERE ARCHITECTS
THE TRAINING CENTRE, TY-MAWR, LLANGASTY
COURTESY DUCHY OF CORNWALL