Removing particle board Floor


I am planning to install a ceramic tile floor in the kitchen and am looking for some suggestions on how to remove part of the old floor. The house is about 30 years old and when we pulled back the linoleum, there is a 3/8 inch layer of particle board (Buffalo board?) glued on top of 5/8 inch plywood.
I have been told that we need to remove the particle board for if it gets wet, it will expand and could lift the floor. What is the best method to remove this particle board? I have tried an ice scrapper but it will take me about a year doing I this way.
Thanks for your help.
Gillian
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I'm sure you will get better and more experienced advice than mine... Have you considered laying backerboard (aka cement board) over your current floor? It should protect the vulnerable particleboard (Buffalo board? That's a new one to me - I don't get it). Stay tuned for the better ideas.
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Usually they are nailed down. Have you double checked for nail heads?

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Hello Gillian,
This was discussed about a week ago on this list (look for "underlayment" as a keyword). I think one suggestion sounded very good, something about setting a circular saw to the depth of the wood flooring, then cutting along the joists to remove the entire floor, then installing a new subfloor. Anyway, a search should get you some more info.
Best -- Terry
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If it is glued down, you might wind up removing both.
I'd check with a good ceramic tile company. This might not be a good DIY project.
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