Originally Posted by
Bluphrog
If you use a 12" (finished) block, you can also use 4", 6" and 8" (finished) blocks. The way you put them together just has to add up to 12". So, 4-6" blocks = 1-12" block; 2-8" plus 2-4" blocks = 1-12 inch block; and 9-4" blocks - 1-12" block. .
These will all work, except the 8" block. To make that a 12 inch block, you need only one 8" block and five 4" blocks. Your graph paper will show you that. Two 8" blocks make 16 inches, and that's too big.