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to download presentation [PDF 12.3MB] - The Heritage Council
to download presentation [PDF 12.3MB] - The Heritage Council
to download presentation [PDF 12.3MB] - The Heritage Council
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Medieval Walls and Towers of<br />
Waterford City<br />
Conservation<br />
Phase 1 Spring Garden<br />
Alley<br />
Phase 2a Semi Lunate<br />
Tower and French Tower<br />
Phase 2b Browns Lane<br />
and Jenkins Lane<br />
Chris Southgate<br />
Southgate and Associates
UNDERSTANDING THE<br />
PROJECT<br />
• ARCHAEOLOGICAL<br />
• LOGISTICAL<br />
• CONSERVATION<br />
• STRUCTURAL CONSERVATION<br />
• COST<br />
• PROGRAMME !<br />
• PRIORITIES<br />
• SAFETY<br />
• SIGNIFICANCE<br />
• PUBLIC ACCESS<br />
• PRIVATE ACCESS
CONCEPT OF CONSERVATION<br />
• Compare with a conserva<strong>to</strong>r’s approach <strong>to</strong><br />
a painting<br />
• Original placement of s<strong>to</strong>nes<br />
• Original mortar<br />
• Evaluating the impact of intervention from<br />
first principles
PRIORITIES<br />
1290-1326<br />
1220-1246<br />
• WALL D<br />
• WALL N<br />
• WALL L<br />
• WALLP<br />
1470-1476<br />
• Recording prior <strong>to</strong><br />
works<br />
commencing<br />
1466-1576
Recording<br />
WHAT ARE THE DANGER’S OF<br />
RECORDING?<br />
COMPARE WITH A PAINTING?
Difficulties in recording<br />
Rectified pho<strong>to</strong>graphy and laser<br />
scanning are both quick on site<br />
• Rectified pho<strong>to</strong>graphy<br />
• Temporary shoring<br />
• Ivy growth<br />
• Trees<br />
• Not enough distance<br />
from wall<br />
• Need <strong>to</strong> work on wall<br />
then scaffolding in way!<br />
• Laser scanning<br />
• Similar problems<br />
• Not always easy <strong>to</strong><br />
present visually
RETHINK ON NATURE OF<br />
WALL<br />
• A PILE OF STONES<br />
• BOUND TOGETHER<br />
BY MORTAR<br />
• THE PLACEMENT<br />
OF EVERY STONE<br />
IS SIGNIFICANT<br />
• THE MORTAR IS<br />
SIGNIFICANT<br />
• NATURAL FORCES<br />
ARE INTENDING TO<br />
DESTROY<br />
• EFFECT OF<br />
MOISTURE<br />
• EFFECT OF IVY
CONSERVATION IS ABOUT<br />
HALTING AND REVERSING<br />
[<br />
DECAY WITHOUT RUINING<br />
THE RUIN
Laser scanning provided accurate three dimensional point cloud and also<br />
showed up different textures of s<strong>to</strong>ne facilitating interpretation and<br />
providing accurate record
Interpretation
Spring Garden Alley<br />
• Major root growth<br />
may involve some<br />
rebuilding<br />
• Capping desirable<br />
• Ownership issues<br />
• Date of wall?<br />
• Priorities
• COPPER TUBE<br />
INTRODUCED DEEP<br />
INTO WALL FOR<br />
MAINTENANCE<br />
TREATMENT<br />
• COPPER<br />
SULPHATE IS ALSO<br />
A NATURAL<br />
BIOCIDE
Complex ownership issues with some buildings on wall
For this reason the first phase was tackled by Steeplejacks
Pointing trials in Phase 1<br />
• 27 different mortar<br />
mixes in contract<br />
documentation<br />
• Training of operatives<br />
<strong>to</strong> recognise<br />
constituent materials<br />
• Talk <strong>to</strong> the wall was<br />
the mot<strong>to</strong>!
Mortar Mixes<br />
• Hydraulic Lime<br />
• Fine sand<br />
• shell<br />
• 5-7mm grit<br />
• 15mm grit<br />
• 25mm grit<br />
• Pinnings round<br />
• Pinnings sharp
Before we started- Emergency<br />
works – Brown’s Lane<br />
• Highly significant<br />
medieval wall<br />
• Consider<br />
conservation<br />
engineering and<br />
minimum intervention
Major Structural problems
• 1795<br />
drawing<br />
shows<br />
ramparts<br />
• One scheme<br />
involved<br />
reintroducing<br />
them <strong>to</strong><br />
stabilise wall
Early rampart probably similar <strong>to</strong><br />
Jamesfort Kinsale
Before we started main contract -<br />
French Tower from Browns Lane<br />
• Consider a complete<br />
conservation<br />
philosophy for all<br />
walls<br />
• Repair and structural<br />
conservation<br />
• Capping<br />
• Pointing<br />
• Interpretation
Before we started – Semi lunate<br />
<strong>to</strong>wer
Capping<br />
• Essential <strong>to</strong> protect<br />
fabric<br />
• When wall at original<br />
height a half round<br />
hydraulic lime NHL 5<br />
capping is used<br />
• When wall is below<br />
original height a<br />
subtle lead capping is<br />
used
REVIEW<br />
• DID WE RUIN THE RUIN?<br />
• DID WE DO ENOUGH?<br />
• DID WE DO TOO MUCH?
Chris Southgate<br />
SOUTHGATE AND<br />
ASSOCIATES<br />
9 DEAN ST<br />
CORK<br />
Info@ chsa.ie<br />
www. southgateand associates. com
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