BOUNDARY LAYER SEPARATION CONTROL … LAYER SEPARATION CONTROL USING A STEP-WALL ... ... Engineering
St Nicholas Parish Church Chiswick - Eastern boundary wall...
Transcript of St Nicholas Parish Church Chiswick - Eastern boundary wall...
Taylor Pearce Limited Chiswick Church memorial stone Completion report 5/10/16
Taylor Pearce Limited, Fishers Court, Besson Street, London SE14 5AS Tel: 020 7252 9800
St Nicholas Parish Church Chiswick -
Eastern boundary wall memorial stone
Conservation Treatment Report
Object:
A rectangular memorial stone with incised inscription dating from 1623 set within an ashlar wall
Dimensions:
Panel: 0.81m x 0.55m
Wall: 2.10m x 1.14m
Condition:
the wall, coping and inscription panel were all heavily soiled by pollution and organic
deposits (photo 1)
the central area of lettering was severely affected by historic water runoff with some letters
barely legible and others completely lost through surface erosion (photo 2)
some areas of the wall had been affected by copper staining caused by water runoff from
the copper roof
areas of ferrous staining (photo 3) had been caused by an old iron fixture (now removed);
evidence of old fixing holes remain on the wall and inscription panel (photo 8)
Taylor Pearce Limited Chiswick Church memorial stone Completion report 5/10/16
Conservation Treatment:
Site set up:
barriers were employed to protect the working area whilst maintaining full vehicular access
at all times
water was taken from a tap close to the Vestry door
power was supplied by a portable generator
Cleaning:
the inscription panel, coping, wall and granite bollards were cleaned using a ThermaTech
steam cleaner (145 °C at 50-70 bar) (photo 4)
further cleaning to reduce and remove sulphation soiling to the inscription and wall was
carried out by the application of 5 no. ammonium carbonate poultices (photo 5)
after removal of each poultice, the surface was carefully scrubbed using a stiff non-ferrous
brush followed by rinsing with the ThermaTech
the poultices also reduced the copper and iron staining (photos 6 & 7)
Re-carving:
individual letters were carefully recut as required to improve the overall legibility of the
inscription (photo 9)
each letter was given a wash application of acrylic paint to improve legibility and to soften
the effect of the newly carved letters (photo 10)
due to the severe erosion of areas of the surface, there was no clear evidence of the original
incised form of the ampersands – no attempt was made to recut these and they were simply
painted onto the surface with an acrylic paint (photo 11)
the acrylic paint was a mix of Payne’s Gray & Titanium White
Repointing:
open joints in the wall and around the panel were raked out and re-pointed with a lime
mortar (photo 12)
the following mortar mix was used:
Natural Hydraulic Lime (NHL 3.5) 1
washed sharp sand 2
Portland stone dust ½
brick dust (for colour) <5 %
Taylor Pearce Limited Chiswick Church memorial stone Completion report 5/10/16
Photographic record:
Photo 1: before conservation
Photo 2: surface of panel
Taylor Pearce Limited Chiswick Church memorial stone Completion report 5/10/16
Photo 3: iron staining
Photo 4: cleaning using ThermaTech system
Taylor Pearce Limited Chiswick Church memorial stone Completion report 5/10/16
Photo 5: poultice application
Photo 6: panel after cleaning & before re-carving of letters
Taylor Pearce Limited Chiswick Church memorial stone Completion report 5/10/16
Photo 7: panel after cleaning showing extent of surface erosion
Photo 8: old fixing holes
Taylor Pearce Limited Chiswick Church memorial stone Completion report 5/10/16
Photo 9: re-cutting of incised letters
Photo 10: inscription after re-cutting & application of acrylic wash
Taylor Pearce Limited Chiswick Church memorial stone Completion report 5/10/16
Photo 11: painted ampersand
Photo 12: repointing joints
Taylor Pearce Limited Chiswick Church memorial stone Completion report 5/10/16
Photo 13: general view
Photo 14: before Photo 15: after
The conservation work was undertaken June/July 2016 by Angus Lawrence and Sam Aldis of Taylor
Pearce Limited. The letters were recut by Philip Surey.
Angus Lawrence ACR Taylor Pearce Limited 5/10/16