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what type of subfloor to put down over a crawl space

i have a house in baltimore maryland and in some spot in the floor it feels soft and dips when anyone walks in those areas.there is about 3' of space between the dirt and the joist in the crawl space which i crawled under to see if the joist were good and they seem to be. i think the plywood is bad? my question is what type of subfloor should i put down? cdx plywood? press board? or is there a new type of under layment on the market? i have scene plywood that has bin treated on one side but are in small peaces 2'x4'. i want to do this replacement one time and get a life time of use out of it. after the sub floor i want to put down wood flooring like it is now.
thanks for any suggestion

Re: what type of subfloor to put down over a crawl space

If you are convinced and sure that your joists are in good condition, then you just need to replace some of the subfloor. I'd recommend to verify this.

I suggest to stay with the same type of subfloor you have now, to avoid variations in floor height, unless you want to replace the whole thing or simply upgrade. Generally, for wood floors and laminate, 3/4" plywood is OK, but your floor could be different.

If you log on to john bridge tile forum, you will be able to find a deflection calculator and information that can help you with your specific needs.

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