One small note, sealant needs an hourglass sort of shape to expand and contract at the thinner middle part, with the wider top/bottom having more contact with the surfaces. So even using a backer rod when it’s not really “needed” for shallower joints between parallel surfaces can still help, if there’s room.
caramelcooler t1_j2b4oyc wrote
Reply to comment by Jstepson in What shower caulk to fill a wide (1/2") gap by climbtigerfrog
One small note, sealant needs an hourglass sort of shape to expand and contract at the thinner middle part, with the wider top/bottom having more contact with the surfaces. So even using a backer rod when it’s not really “needed” for shallower joints between parallel surfaces can still help, if there’s room.