Hello everyone. Pretty nice site you got going on here. I got a couple questions to pose at the folks here. Just moved some renters out of my house in OK and I got to do some work to it to make it livable. Had vinyl in the kitchen area that had lived 99% of its useful life. While removing it discovered it was adhered to 3/8" plywood with medium wt felt. Pulled it up. Found layer of OSB. OSB looked really iffy; pondered it, it needed to come up. Layer of OSB with hvy felt over 1x6 on diagonal. 1x6 looks low side of "OK". Couple of boards will need replacing. I am surprised I didn't have more issues with squeaks as many boards are quite loose. We are looking at putting 1/2" exterior plywood on top of 1x6 then CBU and tile with porcelain tile. Or should I consider pulling up 1x6 as well and installing 5/8" plywood and save my self some grief? Some additional background. We plan on retiring and living in the house. I want to get all the floor issues resolved while I still get a monthly income coming in and able to still physically be able to repair it. Really don't want a floor debacle seven or eight years down the road on retirement salary and 51 year old back to boot. The house was built in 1963 or 1969 can't remember which right now. Think i got the deflection handled as well with joists of 2x8 with 16" centers. Appreciate all that weigh in and give some things to consider as well. Thanks again and have a great new year.