Not an inspector, but I found this site through my web search and thought it might be the right place to ask a question, sorry if this isn’t acceptable.
I’m in the process of selling my house and just got back some requests from the buyer regarding repairs based on the home inspection. I have not yet seen the inspection report, waiting for my real estate agent to get it from the buyers. One of the requests requests in the repair addendum requests that we “investigate and repair elevated moisture readings at the bench in the shower.”
The shower in question is our master shower which I remodeled myself about 1 year ago. I used the USG Durock Shower System with waterproofing membrane to completely seal the shower (including the bench) and performed a leak test prior to installing tile. Once I confirmed there was no leak, I tiled and grouted and have used the shower for the past year without any issues. I have pictures of the construction process proving how everything was done.
I’m not sure how the inspector detected “moisture at the bench,” other than on the surface without tearing the shower apart. I assume he used a conductance type of moisture meter, which probably picked up surface water given that I showered a few hours before the inspection. I doubt he used thermal imaging, but I guess I’ll find out when I get the actual report. I’ll admit that the expansion joints between the bench and the shower wall are not 100% sealed and allow water to get behind the tile but it’s still contained by the waterproof membrane. The lack of complete seal is because silicone is such a pain to work with and I know the waterproofing is underneath that anyway.
I know that the shower is 100% water tight behind the tiles because of the waterproof membrane, and suspect any “elevated moisture reading” is due to superficial water. How can I go about proving that this is not an issue without having to tear the shower apart and rebuild it. Would a thermal scan be able to confirm there is no underlying damage? What kind of contractor or technician would be the type I’d need to hire to do this? Should I hire my own inspector to retest? Thanks for any help you can offer!