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Symbols and Hatchings

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Unit 101/501: Principles of Building Construction, Information and Communication

Learning Objective

To be able to identify symbols and hatchings from drawings in relation to BS 1192

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All sections of the UK Construction Industry should follow a set of official British Standards for symbols and hatching: BS 1192.

Symbols are a simplified representation of an item (eg a run of stairs).

Hatching is a term given to the markings that indicate the type of material that something is constructed from (eg stone, plywood).

Symbols usually appear on floor plans; hatchings usually appear on sectional drawings.

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What symbols can you recognise on this floor plan?

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RangeYou must be able to identify:

WCSinkBath

Door Window

Rough Sawn Timber (unwrot)Prepared Timber (wrot)

BrickworkBlockworkConcrete

HardcoreSub Soil/Earth

Insulation Damp Proof Course (DPC)Damp Proof Membrane (DPM)

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Brickwork, Blockwork and Concrete

Brickwork

Blockwork

Concrete

Stonework

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Concrete is made up of….?City & Guilds | L1 Carpentry & Joinery 6706-13

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Concrete is made up of:

• Coarse aggregate (gravel 5mm to 50mm)

• Fine aggregate (natural sand/tiny pebbles, up to 5mm)

• Cement• Water• Additive (plasticiser)

And if required (eg for foundations)

• Steel reinforcement (rebar)

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Hardcore and Sub-soil/earth

Hardcore

Sub-soil (earth)

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Timber Rough sawn (unwrot)

Generic wrot (prepared) timber:

Softwood (machined all round)

Hardwood (machined all round)

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DoorsCity & Guilds | L1 Carpentry & Joinery 6706-13

As shown on floor plan

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Lights (windows) Light, as shown on floor plan

Standard casementArrow points to hinge (in this example, hung on right)

Double hung (standard sliding sash)

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Plumbing / AblutionCity & Guilds | L1 Carpentry & Joinery 6706-13

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Insulation

Batt and roll (blanket)insulation

Cavity wallinsulation

Rigid (board)insulation

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