Your ideal dimension — we'll snap it to the nearest block-coursed size.
Half-block (200mm) is the standard companion unit. Other cuts need site-cutting.
Nearest coursing
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—mm
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Blocks
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Face module
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Diff from target
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Alternatives around target
Offset
Blocks
Dimension
Δ Target
Vertical coursing check
If the target is a head/sill height, nearest matching course count:
Courses to target
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Course height
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Concrete block set-out notes
All block series (100–300) share the same 390×190 face → 400×200 module. The series only changes wall thickness, not length/height set-out.
Pier between two openings — perpend each end. Dim = N × 400 + 10.
Corner to opening — no joint at corner, perpend at reveal. Dim = N × 400.
Corner to corner — full wall, no end joints. Dim = N × 400 − 10.
Half-length block (190mm face) and half-high block (90mm face) are stock companion units — no site-cutting needed for half-module set-outs.
Block walls are usually dimensioned directly to the 400/200 module. Reinforced/core-filled walls need vertical bars to land in cores — keep openings on full-block centres where possible.
Build the elevation
Add fixed items (corners + openings) and piers in order left-to-right. The solver rounds each pier target onto coursing and reports the total wall length.
Nearest = smallest deviation. Up = never undersize piers. Down = tightest layout fit.
If your overall wall length is fixed (e.g. structural grid), the solver compares the solved total to it.
Solved set-out
Total wall length—
Vs. fixed target—
Elevation — not to scale—
How to use
Build the elevation left-to-right as a sequence of:
Corners — external corners (zero-width, no joint at edge)
Openings — windows/doors at their schedule width (treated as fixed)
Piers — block masonry between items; enter target and solver rounds to coursing