Quote:
Originally Posted by Tidybuoy
My house had 3/4" oak hardwood on top of the subfloor. I am the one installing 3/4" plywood in place of the hardwood floor as it was heavily damaged over the years and has several repairs.
On top of the plywood, I will be installing Schulter Ditra Uncoupling Underlayment. This helps to keep tile from cracking, due to any floor movement. I won't have much movement as I screwed down the floor tight vs. original nails.
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This is what we do to stiff up floors.
Remove all the 1x6 sub floor in that area or room glue, nail, or screw 3/4" plywood for a really stiff floor. If you go that far, I suggest installing a girder on a couple piers for additional support to keep bounce away. We normally use a 4x6 depending on the span. Its better then any crack isolating materials. Still install Ditra on top to keep cracks away. Oh don't forget to block off the joist. Once you have it opened up, all that should take half to a day to do. If you are concern about the unevenness between Mexican tile and existing hardwood flooring, then go 5/8" sub floor or plywood. If the room is big, don't forget to stagger them for added strength. Blocking off them keeps the joist nice ad straight too. Not too much money or work but IMO, the gain is worth it. This is not normally done with normal, standard construction.