Brick Types, Sizes & Properties
Modular brick sizing, face brick compressive strength, Initial Rate of Absorption, pre-wetting requirements, and common brick defects including efflorescence and spalling.
- State the standard modular brick size used in Canada
- Define compressive strength ranges for typical face brick
- Explain Initial Rate of Absorption and when pre-wetting is required
- Identify the causes of efflorescence and spalling
Lesson 1
Standard Modular Brick Size & Dimensions
Why Sizing Matters
Every masonry project depends on accurate dimensions. The standard modular brick size in Canada is the foundation for calculating wall lengths, course heights, and material quantities. Understanding nominal versus actual brick dimensions ensures your layout, bond patterns, and mortar joints all work together correctly.
Nominal vs. Actual Dimensions
A modular brick has an actual size of 7-5/8" x 3-5/8" x 2-1/4". When you add the standard 3/8" mortar joint, these dimensions round up to a nominal size of 8" x 4" x 2-2/3". This nominal dimension is what you use for modular layout and planning.
The Modular System
The modular system means that brick dimensions plus mortar joints equal whole-number multiples. Three courses of modular brick plus their bed joints equal exactly 8 inches in height. One brick length plus one head joint equals 8 inches horizontally. This makes layout calculations predictable and consistent across any project.
Other Brick Sizes
While the standard modular brick is the most common, bricklayers also work with:
- Norman brick - same height and width as modular but 12" nominal length
- Utility brick - same length and width as modular but 4" nominal height
- Roman brick - thin format, 12" nominal length, 2" nominal height
- Jumbo brick - oversized for faster wall coverage
Regardless of the unit size, the standard mortar joint thickness remains 3/8 inch for all modular brick construction. This is the default joint width unless project specifications call for something different.
Exam Tip
When the exam asks for the standard modular brick size, the answer is 7-5/8" x 3-5/8" x 2-1/4" (nominal 8" x 4" x 2-2/3"). Remember that 3/8" mortar joints are what make the modular math work.
The standard modular brick size in Canada is 7-5/8" x 3-5/8" x 2-1/4" actual, with a nominal size of 8" x 4" x 2-2/3" when the 3/8 inch standard mortar joint is included. These dimensions are the basis of all modular layout.