Quote Originally Posted by bouschie View Post
Did you fill the tub with water before caulking? That is the proper way. The weight of the water pushes down on the tub opening the gap a little. This allows caulk to fill the gap and compress when tub is empty, but expand when full without pulling away from the tub.
Yes I filled it. this is actually the 4th or 5th time Ive re-caulked that particular bathtub. Seems a previous owner had moved the bathtub and cut a bunch of joists to fit the new piping, some of it needlessly. When we redid the bathroom about 6 years ago they tried to shore it up a bit but did a piss poor job. End result way too much mouvement and caulking would crack. We changed a patio door under the bathroom last year and had them try to shore it up some more but still not working. Well this year we had a guy level the ceiling not because of the cut joists (well not entirely), someone also removed a supporting wall to turn half the garage into living room space (My garage wouldn't even fit my Yaris, but the motorcycles fit so its ok). Anywhoo long story short they supported it OK but It had dropped 3/4 an inch in the middle. With new larger patio door was very noticeable. Guy I hired to fix the ceiling took the time to make sure Bathtub didn't move any more. Probably about 1/2 the labour costs but worth it.
So now bathtub doesn't move and it was time to re-caulk, hopefully for the final time.