LCA Graphics and Construction Studies common mistakes
LCA Graphics and Construction Studies · Understand the traps and how to avoid them.
Drawing elevations or plans without applying the stated scale consistently, so a 1:50 drawing is dimensioned as if it were 1:100 and walls, openings and fittings end up at half or double their true size.
Candidates set up the sheet and start drawing at whatever size fits the page, then add a scale bar or title afterwards, treating scale as a label rather than a drawing control. Under exam time pressure the temptation is to fill the sheet rather than compute the real-to-drawn conversion.
What to do instead
Before drawing anything, convert two or three key real dimensions into drawn lengths (for example at 1:50, 4 m becomes 80 mm) and mark these on a scrap calculation. Set the drawing out from those converted dimensions, and check the finished drawing by measuring one known element against the scale bar. Never add a scale note that was not used to generate the geometry.
Producing orthographic projections with mismatched views: the plan and elevation do not align vertically and horizontally, hidden detail is omitted, and line weights are uniform so outlines, hidden lines and centrelines are indistinguishable.
Candidates draw each view independently instead of projecting from a common set of construction lines, and they treat line weight as a cosmetic choice rather than a convention that carries meaning. Many have practised only freehand sketching and have not internalised first-angle or third-angle projection rules.
What to do instead
Lay out faint construction lines linking plan and elevations before committing to any outline, and project features across rather than re-measuring. Apply a deliberate hierarchy: thick continuous lines for visible outlines, dashed lines for hidden edges, thin chain lines for centrelines and thin continuous lines for dimension and projection lines. State the projection symbol used.
Confusing material properties in selection questions, for example justifying a structural beam in terms of thermal conductivity, or describing a damp-proof course as chosen for compressive strength when the requirement is impermeability and flexibility.
Property vocabulary is learned as a list rather than as a set of performance requirements, so candidates match a familiar word to a familiar material instead of asking what the element must actually do. Terms such as strength, stiffness, hardness, toughness and durability are treated as interchangeable.
What to do instead
For every material question, state the function of the element first (carry load, resist water, insulate, finish a surface), then list the two or three properties that function demands, then select the material. Practise distinguishing stiffness from strength and hardness from toughness with a one-line definition each, and justify choices by citing the required property explicitly.
Describing construction sequences out of order, such as specifying internal finishes before the roof is watertight, or omitting the damp-proof course, ventilation path or wall ties when describing a cavity wall build-up.
Candidates memorise component names as a set without a timeline, and they have often seen finished buildings rather than site processes. Exam questions that ask 'describe the sequence' are answered as 'list the parts'.
What to do instead
Learn each construction type as an ordered sequence from setting out and substructure through superstructure to finishes, and rehearse it aloud. For masonry, always state the full build-up in order: foundation, damp-proof course, inner leaf, cavity with ties and insulation, outer leaf, wall openings with lintels, and the roof covering before first-fix services and finishes.
Treating building services as isolated add-ons: placing a radiator under a window with no thought to heat loss, running a soil pipe with insufficient fall or without a vent, or showing a ventilation strategy that contradicts the airtightness measures described.
Services are revised as separate diagrams and component names, so candidates do not connect them to the building fabric, occupancy or each other. Environmental control questions are answered with a single measure rather than a coordinated strategy.
What to do instead
For any services answer, link the measure to its purpose and to the rest of the design: state the heat-loss path and the emitter position, give drainage falls and venting explicitly, and pair insulation and airtightness with a deliberate ventilation route. Draw a simple section showing the service in relation to structure and fabric rather than an isolated symbol.
Answering health and safety questions with generic caution ('be careful', 'wear PPE') instead of identifying the specific hazard, the risk it creates, the control measure in the correct hierarchy, and who is responsible.
Candidates conflate hazard and risk, and they have learned safety as a list of personal protective equipment rather than as a process of elimination and control. The hierarchy of control (eliminate, substitute, engineer, administrate, PPE last) is often unknown.
What to do instead
Structure every safety answer as hazard, who is at risk, likelihood and severity, then controls in hierarchy order with PPE as the last line. Name the responsible party (designer, principal contractor, site supervisor, operative) and reference the permit or inspection regime where relevant, such as excavations, scaffolding or hot works.
Jumping straight to a single solution in design-and-problem-solving questions, then describing only that solution, with no analysis of the brief, constraints, or evaluation of alternatives.
Under time pressure candidates treat the design question as a recall test with one right answer, and they have practised producing final drawings rather than documenting the decision process. Marks for analysis and evaluation are therefore left unclaimed.
What to do instead
Use an explicit cycle: restate the brief and constraints, list at least two options, compare them against stated criteria such as cost, buildability, sustainability and user need, select one with justification, then evaluate the outcome and note what would be refined. Show this structure in the answer even when a sketch is the main output.
Presenting coursework or practical portfolios as a folder of finished drawings with no design development, no evidence of testing or iteration, and no evaluation against the original brief.
Candidates believe presentation quality and the final artefact are what is assessed, so they discard rough work, annotated sketches and failed attempts. The assessment criteria reward the record of thinking, which is exactly what gets thrown away.
What to do instead
Keep and submit the development trail: initial brief analysis, annotated concept sketches, mock-ups or material tests with results, revisions with reasons for change, and a final evaluation that refers back to the brief. Label each stage so an assessor can follow the process without asking questions.
Writing answers that name a technique or component without explaining how or why it works, for example 'use a cavity wall for insulation' with no description of the cavity, ties, or moisture path, so the answer cannot earn explanation marks.
Candidates revise using keyword lists and short-answer quizzes, which rewards recognition over explanation. They then reproduce the keyword in an extended-response question and assume the examiner will infer the rest.
What to do instead
For each key technique, prepare a three-sentence explanation: what it is, how it performs its function, and why it is preferred over an alternative in that context. In the exam, always add the mechanism and the reason, and use a labelled sketch where the question carries drawing marks.
Mismanaging time and question coverage: spending most of the paper on the drawing question and leaving extended-response or calculation questions blank, or answering more questions than required and gaining nothing for the extras.
Candidates allocate time by interest rather than by marks, and drawing tasks expand to fill whatever time is available. Reading the rubric carefully under pressure is often skipped.
What to do instead
Before starting, read the whole paper, note the marks per question, and allocate minutes roughly in proportion to marks, leaving a short checking period. Answer the required number of questions only, start with the highest-mark question you know best, and keep drawings to the stated scale and level of detail rather than perfecting line quality.