engineered oak floor stain

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During building work a section of my dining room engineered oak floor was covered with OSB boards and lining paper for protection.

After protection was removed I found a large stain printed into the floor. It does not show up well in photos but it is rather large and spans across 4 planks.

pics link
https://www.dropbox.com/sh/26gcz5w4l6lfqdv/AABGX9LsiYXoz2-orRMzTGqna?dl=0

They either spilled water or primer or god knows what.
Is there any way I could fix this? I tried mild detergents but it looks like it's there to stay...
 
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If moisture you could iron the floor with tissue between iron and floor which will evapourate the moisture into the tissue. Hot iron and keep it moving. try small area first.
 
Thanks, I will give this a try and maybe try other products before considering contacting a specialist.

Is there any chance it cannot be removed, e.g floor would need to be replaced?
 
Thanks, I will give this a try and maybe try other products before considering contacting a specialist.

Is there any chance it cannot be removed, e.g floor would need to be replaced?
Years ago I had a kit for surface resoration but long gone now so cant remember what was in it.
Some times if all else failed I had to sand and refinish but heres a link for somthing to try:
https://m.wikihow.com/Get-Water-Stains-Off-Wood
I suppose there is always insurance?
litl
 
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You won't be able to iron out the moisture unfortunately, and as you've tried detergent, it's in the grain. The floor looks brushed and oiled, so the stain shouldn't have got in, and depending on how long the floors been down, I'd contact the suppliers over it. It may well need sanding down and re oiling I'm afraid.
 
You won't be able to iron out the moisture unfortunately, and as you've tried detergent, it's in the grain. The floor looks brushed and oiled, so the stain shouldn't have got in, and depending on how long the floors been down, I'd contact the suppliers over it. It may well need sanding down and re oiling I'm afraid.

So if water was spilled and left over, between the protection and the floor it should not penetrate?
Is it possible for the sanding/oiling to be seamless with the old floor? And what sort of costs involved for one square meter?
 
In theory, it shouldn't have penetrated, but obviously, not knowing the condition of the floor, it's difficult to say categorically. Try putting some water down again, and see what happens; the stains already there, so you can't do much more damage. How long has the floor been down.

But you wouldn't do one metre I'm afraid, as that'd show as another separate section; the whole floor needs to be done in one go for uniformity.
 
In theory, it shouldn't have penetrated, but obviously, not knowing the condition of the floor, it's difficult to say categorically. Try putting some water down again, and see what happens; the stains already there, so you can't do much more damage. How long has the floor been down.

Hm, that's not good then. The condition should be pretty much newish, the floor is only 3 years old and no shoes are used in the house. As a side note this is the side viewed by the morning sunlight in the summer. It might be water or PVA I'm not sure.


But you wouldn't do one metre I'm afraid, as that'd show as another separate section; the whole floor needs to be done in one go for uniformity.

I imagined a larger area as with paint but the whole floor will have a serious cost uplift. It's good to have this into perspective now.

I'm going to try a few things first.
 
PVA comes off when it gets wetted again, so I think it's lining paper and OBB getting wet (possibly moisture underneath) that's caused the stain. Not sure what else to suggest here I'm afraid, other than contact the suppliers of the wood, and get their comments.
 

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