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Old 01-22-2018, 08:01 AM   #1
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Is it possible to raise a subfloor 2 inches?


My house was built in 1915 and the kitchen was added onto it and then later on the back corner a kind of sun room was added on.The sun room has a 2 inch drop from kitchen going into it. That is measured directly from the sub floor. (All they did was put down the particle type sub flooring, then took this stick back laminate that looks kind of like wood and stuck it directly to the sub floor.)

The actual subfloor is just like a kind of particle board rather than good plywood. My dryer is in the front of this room and my washer is in the kitchen next to my refrigerator. I'd like to move the washer next to the dryer, but I really don't want plumbing added to a room with that kind of floor. Water just dissolves that stuff.

So I am wondering the best way to raise this floor up 2 inches. The finished flooring will be tile of some kind. My first thought was just laying plywood over it and then once I get the other stuff added and finish the floor, it should be relatively close.

I am kind of wondering about weight though. And if I should replace that particle board all together since the underside is exposed in the crawlspace.

Thanks.

I didn't think about it before, but that particle board might be under laminate of some kind. I'll have to crawl under the house and look. I haven't crawled under the sun room yet. But I am still wondering how I can raise the floor height.

Last edited by wagoner; 01-22-2018 at 08:13 AM.
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Old 01-22-2018, 08:20 AM   #2
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Re: Is it possible to raise a subfloor 2 inches?


Double layer of 3/4 T&G plywood flooring, then your tile.

Will bring it up to close.


ED
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Old 01-22-2018, 08:43 AM   #3
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Re: Is it possible to raise a subfloor 2 inches?


I don't think that you can get 2 layers of anything securely attached to particle board. It could be a noisy floor when you're done.
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Old 01-22-2018, 08:50 AM   #4
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Re: Is it possible to raise a subfloor 2 inches?


You attach it through the particle board into the floor joists.


ED
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Old 01-22-2018, 09:20 AM   #5
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Re: Is it possible to raise a subfloor 2 inches?


Yes, that would be the plan but I don't know how doable it is.
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Old 01-22-2018, 09:58 AM   #6
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Re: Is it possible to raise a subfloor 2 inches?


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Originally Posted by de-nagorg View Post
Double layer of 3/4 T&G plywood flooring, then your tile.

Will bring it up to close.


ED
This was my thought too. I think I'll look into this solution. I wonder what the weight would be. I'll sit down and do the math tonight and determine if I have ply under the particle board.

Thanks everyone.
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Old 01-22-2018, 10:49 AM   #7
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Re: Is it possible to raise a subfloor 2 inches?


Take up the particle board. If it ever starts to disintegrate you'll lose support and your tile. Also what is the support structure underneath it? Can the floor joists support tile with out deflecting and causing additional problems?

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Old 01-22-2018, 11:38 AM   #8
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Re: Is it possible to raise a subfloor 2 inches?


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Take up the particle board. If it ever starts to disintegrate you'll lose support and your tile. Also what is the support structure underneath it? Can the floor joists support tile with out deflecting and causing additional problems?

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I'm going to get under there tonight and take some pictures. I'll check back into this thread once I do.
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Old 01-23-2018, 05:45 AM   #9
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Re: Is it possible to raise a subfloor 2 inches?


Sunroom can be robust or jumble of sticks. Finishing such a room means thorough check on how the framing was done. You can't put a heavy appliance on sub standard framing. Joist sizes, how they are attached and supported. Washing machine, esp, will be moving, and you may see cracked tiles and grout.
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