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Gable, gabled
 A gable is a wall with a triangular head, built to support a pitched roof. The roof may rest on the inner side of the skews of the gable, may cover them, or may overhang them. A building with gables may be referred to as 'gabled'.
Related Words Skew, skewput
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Gablet
Used in two senses:
1. a small triangular projection from a wallhead, acting as a gable for a sub-roof.
2. a cope of a triangular section, designed to shed water from a wallhead or parapet.
Related Words Copes, coping; Gable, gabled; Parapet; Sub-roof; Wallhead
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Galvanised mesh
 A panel of steel wire in the form of a grille. The wire may be woven, or in straight lines welded where the wires cross each other - 'weldmesh'. The term 'galvanised' means that the wire has been coated with a thin layer of zinc. This coating prevents the rusting of the underlying steel. Galvanised mesh is used to protect windows from vandalism.
Related Words Steel; Weldmesh; Zinc
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Gargoyle
A projection from a wallhead, originally designed to take rainwater away from the face of the wall. In many 19th century buildings gargoyles are fitted with no practical function, as rainwater is disposed of through downpipes.
Related Words Down pipe; Wallhead
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Georgian
Georgian architecture, built in the 18th and early 19th centuries, is generally-speaking, characterised by simplicity, with plain wall surfaces, large window openings, and careful attention to proportion, and to the relationship between architectural features. In more elaborate Georgian buildings, classical features are often employed. Roof pitches are usually, low, and roofs concealed behind parapets or upstands. In Scotland, classically-detailed steeples, and large round-arched windows are distinctive features of many Georgian churches.
Related Words Classical; Parapet; Upstand
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Georgian wired glass
Panels of glass made with steel wire mesh embedded in the thickness of the panel. The glass is usually made with a rough surface. Used in situations where the shattering of a pane would be risky, either for safety or for security, for instance in rooflights.
Related Words Steel
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Gibbs surround
The ornamentation of a door or window opening by having the margins composed of boldly-projecting quoins alternating with more slightly treated and moulded quoins. A treatment devised by James Gibbs, an Aberdeen-born architect who flourished in the first half of the 18th century.
Related Words Margin; Quoins
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Glulam
A trade name for a beam made from small sections of wood glued together. Laminated timber beams are very strong, and are used to support the roof in many modern churches.
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Gothic (revival)
The Gothic style of architecture was developed in the late 12th century AD, and is characterised by the use of pointed windows. It continued to develop until the 16th century. A few Gothic churches were built in the 17th and early 18th centuries. The style was revived - 'Gothic Revival' - in the early 19th century, and continued in use until the 1950s.
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Gothick
A term used to describe buildings designed in the late 18th and early 19th centuries with a limited understanding of the details of 'real' mediaeval Gothic architecture.
Related Words Gothic (revival)
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Graded slates
 Used of roofs where the size of the slates decreases from the bottom to the top of the skews. Gives the roof a graceful finish. Often described as slates laid in 'diminishing courses'.
Related Words Skew, skewput; Slates
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Greywacke
A dark-coloured rock common in the Southern Uplands, and used extensively in church buildings there. It cannot be dressed to a fine finish.
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Ground water
The water in the ground round a building. This can simply originate in local rainfall, or can well up from adjacent, higher areas of ground. If not adequately controlled, ground water can damage a building, either by supporting wet or dry rot, or by washing away light soil under foundations.
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Gully
 An open-topped box, made of glazed fireclay, cast iron, or plastic, at the base of a wall, into which a downpipe discharges. The top of the gully should be covered by a perforated plate, which can be removed to allow debris to be cleared. A pipe from the side of the gully should link to a drain carrying the water away from the building.
Related Words Cast iron work; Down pipe; Fireclay
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Gutter
The channel that catches rainwater at the edge of a roof. It can be made of cast-iron, plastic, aluminium, lead-lined timber, or stone. Also known as a rhone.
Related Words Aluminium; Cast iron work; Lead; Rhone
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