Lately, I've been using the following method to join granny squares and panels and strips:
It is easier (but not required) if there is a single or double crocheted row around the outside of each square before joining. I've assumed there is a row of sc in the instructions below.
Hold two squares (or panels or strips) with right side facing (for ridge on the top) or with wrong sides facing (for ridge on the bottom); in corner of one square, join with slip stitch; ch 1, join second square in corner with slip stitch, ch 1; * slip stitch in next sc on first square, ch 1, slip stitch in next sc on second square, ch 1 *; repeat between * across to next corner; tie off. One side of the squares (or panels or strips) is now joined.
Alternate: Slip stitch in every other sc. This results in a zig-zag effect.










are you working through both loops
my problem with whip stitching, or single crocheting using only back loop - work does not seem to joined tight enough
I've been avoiding pieced work because of this, but now have one going that I have to join in some way
thx
Yes, I always go through 2 loops. I suppose if I crocheted tighter, I could use one loop without it stretching too much.