Crow-stepped gable

Crow-steps on a Scottish baronial building.

A Stepped gable, Crow-stepped gable, or Corbie step is a stair-step type of design at the top of the triangular gable-end of a building. The top of the parapet wall projects above the roofline and the top of the brick or stone wall is stacked in a step pattern above the roof as a decoration and as a convenient way to finish the brick courses.

Early examples, from the 15th century onwards, are found in England, Denmark, Germany, Switzerland, and Sweden. Crow-stepped gables were also used in Scotland as early as the 16th century.^[1] Examples of Scottish crow-stepped gable can be seen at Muchalls Castle, Monboddo House and the Stonehaven Tolbooth, all late 16th and early 17th century buildings. Crow-stepped gables are also common on Danish medieval churches.

A typical Dutch house in Delft, with a crow-stepped gable.

In the Dutch language, this design is termed trapgevel or "stair-step gable", characteristic of many brick buildings in the Netherlands, Belgium and in Dutch colonial settlements. 19th century examples are found in North America, and the step gable is also a feature of the northern-renaissance revival styles.

Construction

The crow-stepped gables of Glimmingehus, Scania, Scandinavia's best-preserved medieval manor, built in 1499 by a Danish knight.

Monboddo House with prominent crow-stepped gable

Convenient access to the roof ridge motivated the crow-step design, along with the availability of squarish stones to accomplish this form of construction. The access would have been convenient for chimney sweeps and roofers in earlier times, where cranes were non-existent and tall ladders were not common.

With crow steps, the roofing slates (rarely tiles) do not reach the end of the building, so making for a special problem with keeping the roof watertight.^[2] Many different schemes are found for overcoming this, some of which are described below. Terms currently used in Scotland are italicised.

• Slates may be laid to the edge of the crow step, with the last slate raised by a wedge (tilting fillet). Then mortar (lime mortar or cement) would be laid over the edge of the slate to seal the gap. Other solutions involve working with lead.

• A groove approximately 25 mm (1 inch) deep is cut into the inside edge of the steps. A lead abutment flashing is inserted into this groove, called a chase or a raggle. The lead is laid over the end slate, which is raised by a tilting fillet.

• Leading is inserted into a raggle, and used to make a trough, or secret gutter, running down the inside edge of the steps. The far edge of the trough is raised over a triangular fillet. Slates are then laid resting on that trough edge and overlapping into the trough, which is open and runs directly down to gutters (roans).

• Rather than forming a raggle, lead flashings may be placed into the joints between bricks as they are laid.

When lead is to be held into a raggle, small folded lead wedges called bats are inserted at intervals and hammered in so they expand. The raggle is then sealed with mortar.

Muchalls Castle showing south gable at third floor.

Crow steps are frequently made of sandstone, even on buildings otherwise of granite,^[3] and it is said that the porous nature of sandstone leads to problems with water penetration. Because of this, crow steps are sometimes capped with lead or sealed with other materials.

Design variation

There are a number of variations on the basic design. One such structure is Culross Palace built in 1597 which features a veiled woman on the crow steps. Roofs in Scotland are typically steeper than in the rest of the United Kingdom (possibly because it snows more) making for steeper and more step-like steps.

Worldwide examples

Friedrichstadt market in Schleswig-Holstein, Germany

• Baunachshof, Wertheim am Main, Germany
• Fetteresso Castle, Scotland
• Forse House, Latherton
• Kapetanovo Castle, Serbia
• Maybole Castle
• Saint Andrews Tower, Toronto, Canada
• The Castle, Billings, Montana, USA
• Torwood Castle, Stirlingshire, Scotland
• Wickham Court, Bromley, England
• 11 Dyke Road, Brighton, England (formerly the Swan Downer School)^[4]

Alternative terms

Medieval church in Oxie, Scania with typical crow-stepped gables.

Zunfthaus zur Haue (14th century) in Zürich

The Nuttall Encyclopedia suggests this architectural feature is called Corble steps.^[5] However, since it does not give the much more widespread name corbie steps (from the Scots language corbie: crow) it is likely that this was based on a misreading of lowercase "i" as lowercase "l". Another term sometimes used is craw step.

See also

• Cornice
• Gable
• Parapet
• Pediment

References

1. ^ Tolbooths and Townhouses: Civic Architecture in Scotland to 1833, Tolbooth Museum, Stonehaven
2. ^ C.Michael Hogan, History of Muchalls Castle, Lumina Press, Aberdeen (2005)
3. ^ *Tranter, Nigel, The Fortified House in Scotland, Volume IV, pp 167-169, Oliver & Boyd (1962 to 1971)
4. ^ Antram, Nicholas; Morrice, Richard (2008). Brighton and Hove. Pevsner Architectural Guides. London: Yale University Press. p. 160. ISBN 978-0-300-12661-7. 
5. ^ The Nuttall Encyclopaedia, edited by Rev. James Wood, published by Frederick Warne & Company Ltd., London (1900)

External links

• Roper Gate, an example of the use of crow-stepped gable