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I am installing Hardie backerboard for a bathtub surround and plan to tile the tub surround with 12 x 12 ceramic tile.

1. The hardie backerboard is water resistant, not waterproof, so I was planning to waterproof it with Aqua Defense.
2. Installation instructions for Hardie backerboard say to fill the 1/8 inch gap between the boards and cover the seams with thinset and embed alkali-resistant fiberglass tape into the thinset. Hardie does not address using waterproofing.

My question: Do I apply the Aqua Defense after I apply thinset and tape so the thinset is also waterproofed or do I apply the Aqua Defense to the hardie backerboards before I apply the thinset?

It makes sense to me to do the seams with thinset and tape first and then waterproof it.

Some help with this would be greatly appreciated.
 

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