Governing Method
Counts and gross geometric areas taken from the project's own schedules. Area is
A = W × H per unit; balustrade face area is run length × height.
A = n × W × H ; A_rail = L × H Where:
-
n= Count of units from the schedule [each] -
W= Unit width [m] -
H= Unit height [m] -
L= Measured run length [m]
Derived Equations:
A = n × W × H A_rail = L × H L_frame = n × L_frame_each What this is, and what it is not
This is a quantity schedule / takeoff worksheet. It answers “how many, and how much area or length”, which is what a BOQ line needs. It does not establish:
- a manufacturing specification or a bill of materials,
- structural adequacy of a handrail, balustrade, frame or support,
- hardware, locking, finishes, glazing performance or fire rating,
- any product selection.
Those remain the fabricator's and designer's responsibility.
Worked Example (illustrative figures)
- Doors: 240 units at 0.9 × 2.1 m → 240 × 0.9 × 2.1 = 453.6 m²
- Windows: 900 units at 1.5 × 1.2 m → 900 × 1.5 × 1.2 = 1,620 m²
- Balustrade: 480 m run at 1.1 m → 528 m² face area, and 480 m linear
Items counted: 1,140. Measured area: 2,601.6 m². Linear: 480 m.
Assumptions & Limitations
- Counts and sizes are taken exactly as entered from your schedules; EngiMetric does not check them against a drawing.
- Areas are gross; no deduction for glazing, frames or openings is applied.
- No wastage, offcut or cutting allowance is added — add it explicitly if your practice requires one.
- Implausible sizes (a door 50 mm wide, a leaf 100 mm high) are rejected rather than reported.
- Where a count exists but no size, the area is reported as unresolved rather than as zero.
Frequently Asked Questions
Is this a door schedule?
No. It is a quantity takeoff: it counts and measures. A real door schedule carries fire rating, glazing, hardware, finish, frame type and reference — none of which are inferred here.
Why does my area say "Unresolved"?
Because you supplied a count without a size. The count is valid, but area needs two dimensions. Supply the width and height and the area resolves.
Does it check the handrail is structurally adequate?
No. It gives you the run length and face area for pricing. Balustrade structural adequacy is a design check against the applicable code and is not performed here.
Engineering Disclaimer
Engineering Note: Quantity takeoff only. This tool does not produce a manufacturing specification, a bill of materials, or a structural design, and must not be used as one.
Technical References
- Counts and dimensions must come from the project door, window, railing and metalwork schedules.
- Fire rating and escape requirements for doors are defined by the applicable building code and must be specified separately.