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A few tiles on the top of our bath hob cracked and sections fell off. Turns out it was a bit of a shoddy job initially with wall tiles and a rubber based glue. I was hoping to just patch up with some replacement tiles for a short term fix. I removed the remaining sections but I’m concerned about some small holes in the underlying yellow membrane? Is this the waterproofing(I thought it was generally blue/grey)? Given it’s not on the floor can this be patched up or could we waterproof over the top of the new/existing tiles?
Welcome to the Bunnings Workshop community @tris3. It's wonderful to have you join us, and many thanks for your question about repairing a bath hob.
If this yellow product appears to be some type of painted coating, then it's likely to be the membrane. Regardless though, the hob should have a membrane over it, and any damage to the area could have compromised it. Typically membranes shouldn't be patched up and must be one continuous coating. The problem with patching a membrane is once you've tiled over the area, any failure and damage being caused is hidden away. If you are concerned, I'd suggest employing the services of a qualified waterproofer to take a look at it for you. They might be happy to clean up the area and apply another coat of waterproofing over the hob's surface before re-tiling.
Let me mention one of our knowledgeable members, @Vis-á-vis, to see if they have any thoughts.
Please let me know if you have any questions.
Mitchell
