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Installing hardwood when there's a slight incline


mchrist's Avatar
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09-05-17, 07:54 AM   #1  
Installing hardwood when there's a slight incline

Hi. A previous owner installed an addition to our house. We want to install 3/4" hardwood there. The addition seems to have settled a bit and there's a slight incline at the doorway into the addition. The incline is about 18-inches long, but drops only about an inch along those 18-inches. The rest of the floor is in good shape.

Can we install hardwood on this include or will the wood just gap?

Any suggestions/advice is greatly appreciated.

Thanks.

 
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Pilot Dane's Avatar
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09-05-17, 08:43 AM   #2  
You might get away with a traditional nailed down tongue and groove. I would not try a click lock flooring .

Then of course there is the big underlying problem of the sinking room. I would inspect underneath and find out why the room has sunk. Before doing new flooring would be a good time to do foundation repairs and jack up the room to return the floor to level.

 
mchrist's Avatar
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09-05-17, 08:56 AM   #3  
Many thanks for the suggestions.

 
JIMMIEM's Avatar
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09-06-17, 06:31 AM   #4  
If you find that the height difference is not a structural problem and there to stay then one way to handle this incline situation is to use your vapor retarder material in an overlay pattern to gradually reduce the height change. The vapor retarder will be like Aquabar B or even roofing felt....Aquabar B is much nicer to work with. Lay the first row across the incline. The next row is laid over the first and pulled back a few inches into the new addition, The next row is laid over the second row and pulled back a few inches into the new addition. This overlaying continues to remove the effect of the slope.
You are actually gradually lessening the slope. You won't be raising the floor the full inch....just enough to gradually lessen the slope so that the new hardwood will have a barely noticeable verrry gradual slope.This technique is used when there are dips in the floor too...the material is put down the way a topographical map is constructed.


Last edited by JIMMIEM; 09-06-17 at 06:35 AM. Reason: add/change info
 
Marq1's Avatar
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09-06-17, 08:44 AM   #5  
but drops only about an inch along those 18-inches
An inch over 18" is a lot of slope, if there is an inch of height difference between the floors you cant feather that out with felt, the height difference is still there.

You need to look at raising the lower floor up so that everything is level.

 
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