Is caulk enough to fill gaps in hardie backer board before tiling shower?
My contractor is in the process of installing tile. He applied red guard and let it dry.
I noticed some gaps in between boards and he said he would be filling with caulk. We had leaking issues with our old shower so I may be a little over cautious because of that.
I’ve seen others fill joints with tape and mortar, but is that necessary?