15 Waterfront archaeology and vernacular
architecture: a London study
G Milne
Abstract
The recording of well-preserved timber structures on waterfront excavations enables characteristics of the vernacular
carpentry of a particular period to be identified and assessed. This is of crucial importance to the study of periods
for which few or no examples of timber buildings survive on dry-land sites. This paper reviews evidence from the
medieval London waterfront (examined in more detail in Milne 1985a, 155-76), arguing that the implications of such
a study extend well beyond problems concerning the construction of riverside revetments. By way of an example,
the date and manner of the initial introduction of fully framed buildings to London is examined.
Introduction
The process of reclamation or extension on the urban
waterfront is now well known and the importance of the
excavation of such sequences appreciated, as the
proceedings of the first two waterfront conferences
make clear (Milne & Hobley 1981; Herteig 1985c).
Apart from the major topographical implications, work
on the waterfront has provided other wider archaeologi-
cal benefits, ranging from the recovery of large, closely
dated finds groups to the study of changing styles of
wharf construction (Milne 1987). It is an aspect of the
latter subject that this paper attempts to summarise.
Intensive archaeological work on the London water-
front began in 1972 (Milne & Milne 1979) and is still
continuing. A remarkable series of well-preserved
timber structures has been recorded, ranging in date
from the 1st to the 17th century (eg, Milne 1979; Milne
& Milne 1982; Milne 1985b; Tatton-Brown 1974;
Miller et al 1986). Although all of the riverfront revet-
ments shared the same function, each was different. It
is argued that the differences observed reflect changes
in contemporary building practice, once the structural
attributes particular to the waterfront situation are dis-
counted. A study of the medieval waterfront installa-
tions of 11th to 15th century date may thus be used to
illuminate the development of timber buildings in
general, in a period which witnessed the change from
earthfast post structures to box-frame buildings.
There is little evidence to suggest that London's
riverfront revetment construction was the work of spe-
cialist carpenters. The only named carpenter known to
have built revetments in the city is Richard Cotterel,
who was employed not only to rebuild the timber face
of Broken Wharf in 1347, but also to construct the jetty,
fence, and sheds (Salzman 1952, 435). The three car-
penters engaged to work upon a Southwark wharf in
1389 were required to rebuild two watermills and the
millhouse as well (Salzman 1952, 467-9), while two
carpenters employed to work on the roof of Westmin-
ster Abbey were also mentioned in a contract for a
wharf at Vauxhall in 1476-7 (Woodward-Smith &
Schofield 1977, 284).
The evidence from urban excavations where water-
front installations and contemporary buildings have
been found supports the general proposition that the
construction of both types of structure, although clearly
different in function, utilised the same range of techni-
ques. That this approach differs from the methods
employed by other specialist carpenters, such as boat-
builders, is also apparent. The most cursory examina-
tion of the Scandinavian material makes this point
emphatically: the solid lafted (half-lapped) block-house
tradition of house building is obviously reflected in the
form of the waterfront kar structures, and contrasts
starkly with the graceful planked form of the contem-
porary shipping.
It is therefore argued that the waterfront installations
in medieval London were erected by the same men who
were responsible for timber building elsewhere in the
city. Since so few examples of their craft survived the
ravages of fire, the Blitz, and the pressures of urban
renewal, one of the only ways that general changes in
London’s timber building traditions can be recorded,
studied, and appreciated is through the waterfront
material.
Vernacular timber building traditions
in medieval London
Consideration of medieval London revetments and the
reused timbers they incorporated demonstrates that
three main techniques or traditions are represented:
earthfast post; stave; framed.
For convenience, the
ensuing discussions will be conducted under these
heads, but how discrete the techniques actually were in
practice is a question that will be considered later.
Earthfast post building,
in which the principal posts
of the structure are set into the ground. On the water-
front or in well construction, the technique is recorded
from at least the 11th century into the 13th century.
The technique is also known to have been used in
10th-12th century buildings in the city (Horsman et al
& 1988), although the evidence for these only survives in
the form of post-holes. The types of planked cladding
116
London, waterfront archaeology and vernacular architecture
117
Fig 15.1 London: stave-wall construction techniques re-
presented on the waterfront: A staves butted flush; B
staves joined with false or free tenons; C staves joined with
dowels; D rebated staves; E vee-edged boards
118
Milne
associated with the earthfast waterfront structures
include planks set in grooves cut into the edges of the
upright posts and planks fixed to the face of the posts
with wooden pegs.
Stave building,
in which vertical timbering provides
both the structural rigidity for the building and also the
wall cladding (Fig 15.1). Examples of this technique
from the London waterfront date from as early as the
11th until the 15th century, and therefore represent a
technique of considerable longevity. Wall types
recorded include the use of vee-edged boarding; staves
butted flush; staves joined with dowels; staves joined
with false or free tenons; and staves joined with rebates
cut on opposing edges. All but one of the London
examples of stave walling incorporate a baseplate,
usually with a groove cut along its length into which the
feet of the staves were set. It is now clear that the
buildings incorporating baseplates which were con-
structed in London before the Norman Conquest were
stave structures, not fully framed buildings (Horsman
et al
1988).
Framed buildings,
in which the structural carcass
comprises an integrated framework of timbers which
relies on its site for no more than the support of its
weight (Hewett 1980, 57). In buildings of this distinc-
tive type, the principal posts are set in baseplates, after
which the wall-cladding is applied to, or infills the
framework. On the London waterfront, baseplates
accommodating vertical posts are introduced into revet-
ment and river-stair construction in the early 13th
century, showing that the general technique would have
been in use elsewhere in the town by that date.
Introduction of framed buildings in
medieval London
The introduction of the fully framed building could
only occur after the development of a number of specific
structural attributes, including:
a
the use of timbers of squared, uniform scantling
b
the introduction of well-cut, closely fitted joinery
c
the use of a baseplate
d
the adoption of the mortice and tenon with two
shoulders to form the basic articulation at the head
and foot of principal posts
e
the adoption of the chase-tenon as the basic articula-
tion for diagonally set braces integral to the frame.
Since none of these elements is required of necessity
in an earthfast structure, it could be argued that framed
buildings represent a new building tradition, imported
into London, fully developed, some time after the
Norman Conquest. However, a recent study of the
well-preserved riverfront structures allows a different
interpretation. It is suggested that the technique of
framed building was gradually developed following a
fusion of attributes taken from the otherwise quite
separate stave and earthfast traditions, which were
themselves developing independently. From the list
above, it seems that c and d were attributes taken from
the stave-building tradition, while the other attributes
(a, b,
and e) were all being developed and used in
earthfast structures in the 12th and early 13th centuries.
Fig 15.2 London: A & B pre-Conquest square through-
mortices from the Billingsgate Lorry Park site (BIG82);
C 13th century rectangular through-miortices (BIG82);
D 14th century standard rectangular mortices, Trig Lane
site (TL74)
Evidence to support this suggestion is found in a
number of hybrid structures of that date recently
recorded on the London waterfront. For example, at
Sunlight Wharf (site code SUN86), a stave wall was
found in which the staves were set in a series of basepla-
tes separated by braced earthfast members; on the
Thames Exchange site (site code TEX88), massive
earthfast posts were braced with squared timbers
articulated with well-cut pegged joints, reminiscent of
the remarkable early 18th century hybrid of earthfast
post and framed building at Cedar Park (Hobley 1982,
fig 24).
The cutting of, and preference for individual joints
also changed. The standard mortice and tenon, the joint
which is basic to all fully framed building, is unknown
in London before the Norman Conquest. Square
London, waterfront archaeology and vernacular architecture
119
Fig 15.3 London : range of mortice-and-tenon types represented on the waterfront: A
splayed recess (BIG82); B chase tenon (TL74); C standard tenon (TL74); D spurred
tenon (TL74); E bare-faced tenon (TL74); F tusk tenon (TL74)
1 2 0
Milne
Fig 15.4 London: range of lap-joints represented on the waterfront: A halved (TL74); B diagonal (TL74); C notched
(TEX88); D secret notched (TEX88); E lap dovetail (TL74)
through-mortices were used initially, and the stages
through which the joint developed in the 11th and 12th
centuries until it reached its more familiar form, can be
traced (Fig 15.2). The front braces used in the earthfast
revetments and the earliest baseplated structures
articulate with the posts by means of a splayed recess,
into which the crudely shaped head of the brace was
wedged (Fig 15.3). By the end of the 13th century, the
joint selected for such a position was invariably a well-
cut chase mortice and tenon. Again, there is plenty of
evidence for notched lap-joints from the 12th to the mid
13th century in situations where later the chase tenon
would be used. Lap-joints can always be used in earth-
fast building or similar structures in which the principal
posts are raised first, and the bracing subsequently
applied to them (Fig 15.4). However, in fully framed
structures in which post and braces are raised in
integrated units, such lap-joints cannot be employed,
and the mortice and tenon must be used.
Conclusion
The recent study of well-preserved structures on the
city waterfront summarised here has shown that the
techniques used in the construction of the medieval
riverfront revetments were varied and subject to con-
siderable change. The significance of the changes
recorded is considered to be wide ranging, for the struc-
tures represent a remarkable sample of truly vernacular
building: as such they may be compared profitably with
other studies based solely on surviving higher-status
structures, such as tithe barns, cathedral roofs, and
manor houses (eg Hewett 1969; 1980). It has been
shown that there were two main traditions in evidence
in London in the pre-Norman-Conquest period, earth-
fast-post building and stave building. However, these
two traditions did not exist in isolation, for not only was
there development of a tradition, but there were also
development between traditions (Milne forthcoming).
As a consequence, the box-frame building was gradu-
ally perfected in London in the period between the mid
12th and the late 13th centuries. Although this new
tradition completely superseded the earthfast techni-
que, stave building continued to develop until at least
the 15th century. How representative this picture is of
developments in vernacular building elsewhere in the
country awaits the excavation and study of similar large
groups of well-preserved vernacular timber structures
in other regions.