Aggregate
Sand and gravel mixed with cement and water to make concrete.
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Airbrick
Inserted beneath suspended floors concrete and timber also can be used in roof spaces.
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Airlock
A blockage in a pipe which is caused by trapped air.
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Apex
A triangle of brickwork known as the gable usually at the end of a house that supports the roof
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Appliance
A domestic machine such as a dishwasher, washing machine, freezer, oven etc.
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Architrave
The wooden moulding around doors used to cover the gap left between the frame and the plaster.
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Asbestos
An insulating material used in the past, which can be a health hazard and must be removed by a specialist.
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Asphalt
Black, tar-like material, strongly adhesive, waterproof and often used on flat roofs.
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