The tiles look intact but the close up reveals a lot of grout loss, you could order some grout and apply it by hand in those areas, I'm sure the grout Dennis has will work. You'll definitely need something to prevent water from getting underneath, but overall as it appears with it's age in mind it looks to have a significant amount of life remaining. Keep your temps below 350 and you should be ok anything higher and your pushing the limits. Hey, it's ony my opinion and you know what people say about them, everybodys got one. Great pic Toney, I had to take a back seat on this and let you blaze the trail, it wouldn't be fair to cut the line.