Tile setter not waterproofing shower
Could someone please point me in the right direction? Our tile setters are using Fiberock tile backerboard for the shower walls. The Fiberrock was applied directly to the studs, there is no plastic behind it. They tape and waterproof the seams and corners, but not the entire wall. I thought the entire wall needed to be waterproofed.
If I want, I can apply waterproofing to the entire wall myself, which would be less expensive than having them do it. Do I need to do this? And if industry standard is to waterproof the entire walls, can someone let me know where I can find this in writing to show my GC? Thanks