A mockup uses U.S. modular face brick. Which actual brick size corresponds to the nominal modular unit used with a standard mortar joint?
Correct Answer
B) 3-5/8 in. by 2-1/4 in. by 7-5/8 in.
A modular brick actual size is commonly 3-5/8 in. by 2-1/4 in. by 7-5/8 in., which works with a 3/8 in. mortar joint to form nominal modular dimensions. Other choices: 4 by 2-2/3 by 8 is the nominal module, while the other sizes do not match the standard modular brick dimensions.
Why This Is the Correct Answer
A modular brick actual size is commonly 3-5/8 in. by 2-1/4 in. by 7-5/8 in., which works with a 3/8 in. mortar joint to form nominal modular dimensions.
Why the Other Options Are Wrong
Option A: 4 in. by 2-2/3 in. by 8 in.
Choice A (4 in. by 2-2/3 in. by 8 in.) is rejected because 4 in. by 2-2/3 in. by 8 in. is a different published number than the cited Brick dimensions value; Modular brick dimensions supports 3-5/8 in.
Option C: 3-1/2 in. by 2 in. by 7-1/2 in.
The trap in C is 3-1/2 in. by 2 in. by 7-1/2 in. That selection is wrong because 3-1/2 in. by 2 in. by 7-1/2 in. is a different published number than the cited Brick dimensions value; Modular brick dimensions supports 3-5/8 in.
Option D: 4 in. by 2-1/4 in. by 8 in.
Choice D gives 4 in. by 2-1/4 in. by 8 in. Its specific error: 4 in. by 2-1/4 in. by 8 in. is a different published number than the cited Brick dimensions value; Modular brick dimensions supports 3-5/8 in.
Memory Technique
File brick dimensions under a redline: condition first, number or duty second, answer 3-5/8 in. by 2-1/4 in. by 7-5/8 in.
Reference Hint
Open Modern Masonry - Brick, Block, Stone, 9th Ed., 2020; use the index entry or section for "Modular brick dimensions" to confirm that A modular brick actual size is commonly 3-5/8 in.
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