A wall is build using standard brick (L=8", H=2-1/4", Thickness= 3- 3/4 in).

A wall to be built with bricks is one brick thick. How many bricks are required if motar is 1/4 in thick?

The solution states that the new length of the brick (with the motar) 8"+ 1/8" + 1/8" = 8 1/4" and the height of the brick with the motar is 2 -1/4" + 1/8" +1/8" = 2- 1/2".

This is where I am confused:

**shouldn't the new length and height of the brick be**: 8"+ 1/4" + 1/4" = 8 1/2" and 2 -1/4" + 1/4" +1/4" = 2- 3/4" respectively. Or this is standard? It appears that the author is splitting the mortar into two, then adding it (mortar thickness/2) to the brick's length and height.

FYI, The problem in his book is on page 103 for the construction folks who have this book