Wall thickness nomenclature — nominal thickness of a one-brick wall (in millimetres) In standard modular brick masonry, what is the nominal thickness (in mm) of a one-brick thick wall including mortar joints, as used in drawings and specifications?

Introduction / Context:
Masonry wall thickness is often specified by “half-brick”, “one-brick”, “one-and-a-half brick”, etc. For quantity estimation and detailing, these correspond to standard nominal dimensions including mortar joints, not just the unit size.

Given Data / Assumptions:

• Standard modular brick size around 190 × 90 × 90 mm.
• Mortar joint thickness about 10 mm.
• Nominal dimensions used for specification.

Concept / Approach:

A one-brick wall is nominally 200 mm thick (i.e., length of a standard brick plus mortar). By contrast, a half-brick wall is about 100 mm, and a three-quarter-brick wall about 150 mm. The 190 mm option corresponds roughly to the unit length without the joint and is not the nominal wall thickness used for specification.

Step-by-Step Solution:

Verification / Alternative check:

Schedules of rates and building specs typically list one-brick walls as 200 mm nominal for BOQ and drawings.

Why Other Options Are Wrong:

• 90 mm and 150 mm correspond to half and three-quarter brick categories.
• 190 mm omits the mortar allowance and is not the nominal specification.

Common Pitfalls:

• Mixing unit dimensions with wall thickness nomenclature including joints.

Final Answer:

200 mm.