A: Nope. Runs down the wall. Not the greatest product and wish I didn’t buy it to be honest. Pretty much all cracked up now.
A: Unfortunately no crack stix can not be used on vertical cracks. The material will run out of the crack as it melts.
A: Yes, this product is ideal for that application.
A: You do not mention how big the gap is, but it should work the same as filling a crack or expansion joint in the driveway. If you are dealing with more than 3/8 inch, I would clean the gap with a wire brush and stuff filler rod (cellulose material which comes in a coil) into the gap first. Then place the Crack Stix half way down, and apply heat to melt.
A: Should do just fine as long as it is concrete or brick on all sides. Worked great in our driveway