Particle board under kitchen cabinets

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Old 04-01-15, 08:27 PM
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Particle board under kitchen cabinets

After yanking out my kitchen cabinets, I found a section of particle board [I guess that is what it is] about 4' x 1' x 1" that seems rotted and has a dried black "mold-looking" stain on it -- Seems to be from more than a decade ago.

Was thinking about carving out this section and replacing it but, am not sure where to get replacement [or if I could just use plywood].

Is this worth the trouble of replacing?

edit: the light spot in the middle seems a bit rotted and easily scraped away.
 
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Old 04-01-15, 10:41 PM
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Looks to me like you have particle board underlayment as a subfloor. It was common some thirty or so years ago but it cannot take ANY water. Yes, I think it worthwhile to remove that section and replace with plywood.

Others may have more ideas.
 
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Old 04-02-15, 02:39 AM
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I've worked on a lot of mobile homes that have PB floors and I always replace any damaged PB with plywood [or sometimes OSB] The biggest concern is getting the right thickness. You'll have to measure the thickness where the PB isn't swollen.
 
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Old 04-02-15, 03:59 AM
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Some of the particle board was actually 3/4" thick. "3/4" plywood is thinner. You may have trouble finding anything the right thickness.
 
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Old 04-02-15, 06:31 AM
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Good point about swelling -- It currently measures approximately 15/16" [give or take a bit].


You may have trouble finding anything the right thickness.
That is my dilemma -- Though it will be under the cabinets so exact thickness may not be so critical.

Yes, house was built in '68.


Thanks
 
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Old 04-02-15, 06:35 AM
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If you will be updating the kitchen flooring, then the correct step is to remove ALL the particle board and replace with a quality subfloor like Advantech or equivalent. The particle board most likely goes throughout the whole room.

What type of flooring are you planning. Particle board really has no place with any flooring these days except possibly under carpet and pad. Even then, there are issues if you spill a drink or have pet accidents.
 
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Old 04-02-15, 06:44 AM
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What type of flooring are you planning. Particle board really has no place with any flooring these days
Will be putting in sheet vinyl and would like to be able to do it correctly but, not sure that I have enough time at this point.
 
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Old 04-02-15, 07:02 AM
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There's really only one way to do this right if you're replacing the flooring and Z laid that out in post # 6.
 
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Old 04-02-15, 03:39 PM
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It isn't a good idea to put sheet vinyl on particle board.
 
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Old 04-02-15, 04:32 PM
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I agree 100% no way would I leave that.
Vinyl flooring can not be installed over Advanec.
Needs 1/4" multiply underlaymant plywood first.
 
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Old 04-02-15, 07:57 PM
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And underlayment won't hold fastened to the particle board either.
 
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Old 04-02-15, 08:19 PM
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Is there anywhere that particle board IS preferred? I know it makes lousy shelving if not combined with some kind of continuous support.

Or is particle board just a failed attempt to utilize wood waste?
 
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Old 04-03-15, 03:50 AM
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PB is preferred under formica because it's generally flatter/smoother than plywood .... but if the PB gets wet more than twice, the top is toast
 
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