Back-Siphon
The backflow of water within a plumbing system caused by the failure of mains water pressure. This can lead to pollution of the water tank.
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Balanced Flue
A system that allows a heating appliance, for example a boiler, to draw fresh air from, and discharge gases to, the outside of a building.
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Ballast
A sand-and-gravel mix sometimes used as aggregate for making concrete.
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Baluster
A vertical post that supports a stair handrail.
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Balustrade
The safety barrier which runs alongside a staircase or landing.
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Banister
The handrail on a staircase.
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Barge Board
A timber board that covers the ends of roof timbers, protecting them from rain. They follow the lines of the apex on the gable-end. Also known as Verge Boards or Gable Boards.
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Batten
A narrow strip of wood normally used to fix slates or other sheet materials in place.
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Bead
Small moulding with a convex cross-section - normally made of wood.
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Benching
Smooth concrete slope within an inspection chamber, next to a drainage channel. Also known as Haunching.
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Bitumen
Black, sticky material, related to asphalt and used in sealants, mineral felts and damp-proof courses.
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Bond
Arrangement of bricks to ensure stable brickwork.
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Breathable felt
A specialist felt that allows air to pass through in order to keep the roof space vented. Eliminates the need for separate roof vents.
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Breeze Block
Various types of concrete and thermal building blocks.
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Brick
There are two types of brick: facing bricks are used for any visible exterior wall, common bricks are cheaper and used underground, behind plaster or in the middle of large walls.
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British Standards Institute (BSI)
The National Standards body of the UK that works with Government, business and consumers to develop private, national and international standards and to ensure that products and services meet laws and regulations.
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Building Line
A length of string stretched between two points which acts as a marker for building works. Also a bricklayer uses one when building a wall.
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Building Regulations
Under the Building Act 1984, these are the laws that control layout and materials used in building. They aim to ensure strength, durability, health and safety.
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Buttress or Pier
A vertical projection, which thickens a wall to strengthen it.
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