ITI/NCVT Mason Building Constructor (AITT Theory) common mistakes
ITI/NCVT Mason Building Constructor (AITT Theory) · Understand the traps and how to avoid them.
When a question describes a scaffold platform or a trench, the candidate answers from habit ('2 m for everything') instead of separating the different safe-height and support rules for scaffolding, ladders, and excavation, and picks a single figure for all three.
Safety figures are learned as isolated numbers without the context they belong to, so under exam pressure the candidate recalls the most familiar number rather than the one tied to the described situation.
What to do instead
Build a one-page comparison table with columns for scaffold, ladder, and excavation, listing the relevant height, width, and support values for each, and practise sorting short scenario stems into the correct column before choosing an answer.
The candidate treats brick, block, and aggregate sizes and mass/volume conversions as interchangeable, for example converting a mortar volume to bags of cement without applying the correct mix ratio and bulk density.
Material questions mix nominal dimensions, standard weights, and mix proportions in one stem, and candidates who memorise only one number per material cannot chain the steps.
What to do instead
Work through at least ten short calculation drills that each show every step: standard brick size, mortar joint thickness, dry-to-wet volume factor, cement:sand ratio, and bags per cubic metre, writing the unit at each line.
The candidate identifies a bond by its appearance in words only and confuses English, Flemish, stretcher, and header bonds when the stem asks about the number of headers, the strength, or the wall thickness where the bond is used.
Bond names are memorised visually or by rote, but exam stems test the structural consequence and the header count, which require reasoning about the pattern rather than naming it.
What to do instead
For each common bond, draw a small plan and elevation sketch from memory showing header and stretcher placement, then write one line on its strength, appearance, and typical use; redraw weekly until the sketches are accurate without reference.
The candidate applies one mortar mix ratio (for example 1:6) to every situation, ignoring whether the work is load-bearing brickwork, plastering, or a damp-proof course, and ignores the difference between nominal and design mixes.
A single remembered ratio feels safe, and candidates do not link mortar grade to the exposure and structural demand described in the stem.
What to do instead
Make a mortar selection chart mapping work type and exposure to mix ratio and grade, and answer practice stems by first naming the work type and exposure, then choosing the mix from the chart.
The candidate reads a levelling or setting-out stem and adds or subtracts staff readings in the wrong order, or forgets that a backsight is added and a foresight subtracted when computing reduced levels.
The rise-and-fall and height-of-instrument methods are learned side by side, and candidates mix the sign conventions or skip the check that the arithmetic should balance.
What to do instead
Practise a full level book with five or more instrument stations using the height-of-instrument method, and always finish with the arithmetic check (sum of backsights minus sum of foresights equals last reduced level minus first reduced level).
The candidate answers foundation and footing questions by quoting a single depth or width figure without considering soil type, bearing capacity, or the difference between shallow and deep foundations described in the stem.
Foundation rules are memorised as fixed numbers, but exam questions embed soil and loading clues that change the correct choice.
What to do instead
Study a comparison table of shallow versus deep foundations covering strip, isolated, raft, and pile, and for each note the soil conditions and loading that suit it; then practise choosing a foundation from a described soil and load.
The candidate confuses arch and lintel terminology, mixing up skewback, springing line, intrados, extrados, and rise, and cannot state where a lintel is used instead of an arch.
The vocabulary is unfamiliar and similar-sounding, and candidates learn the diagram labels without linking each term to its structural function.
What to do instead
Label a hand-drawn arch diagram from memory with all key terms, then write two sentences on the load path in an arch and in a lintel, and list the span and loading conditions where each is preferred.
The candidate computes plaster or paint quantity from the plan area only, forgetting to deduct openings or to add reveals, soffits, and ceiling areas, so the estimate is understated.
Candidates treat measurement as simple area multiplication and skip the measurement rules for deductions and additions that the exam tests directly.
What to do instead
Work through measurement exercises using a small room sketch, listing every surface, applying the deduction rule for openings above the threshold, and adding reveals and soffits line by line before totalling.
The candidate describes a repair or waterproofing method generically, such as 'apply waterproof coating', without naming surface preparation, the order of layers, or the curing and testing step the question asks for.
Repair and waterproofing knowledge is recalled as product names rather than as a sequence, so the candidate cannot order the steps correctly.
What to do instead
Write numbered method statements for three common cases (damp-proof course failure, roof terrace waterproofing, and crack repair) including preparation, priming, layering, and testing, and rehearse them in order.
The candidate answers employability and workplace questions with vague statements about teamwork and safety and does not use the specific terms the question expects, such as the correct reporting channel, the purpose of a toolbox talk, or the meaning of a permit to work.
These topics feel like common sense, so candidates do not study the defined workplace procedures and answer in generalities that miss the marking points.
What to do instead
Make a glossary of workplace terms (toolbox talk, permit to work, PPE matrix, hazard reporting, housekeeping) with a one-line definition and one example each, and practise answering scenario questions using the exact term.