Do I Square a block before or after adding sashing
 

Help, I think I know the answer, but not sure. I am going to add a sashing strip to each block side and bottom (top too on first row). Not sure when to square - before or after adding sashing strips....

Probably both - right.

I square all my blocks before adding sashing. I then add side strips to all the blocks. I generally use on long strip between the rows and on top and bottom.

Before.

I have not figured out a way how to do it after.

I square my blocks before sashing and recheck again before sewing together to make sure it all matches up.

I tend to square or check for square whenever I can. It is easier to take the time and have no regrets.

if the blocks need it, I square before adding sashing.

I'm with everyone else--before sashing. I also measure after sashing but usually don't need to cut again.
Sue

Before. Otherwise you are just sewing sashing to an inaccurate shape.

Before, otherwise your block would be off ..after sashing.

I agree with all....BEFORE !!!