Laminate on bad floor

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Old 03-20-15, 11:10 AM
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Laminate on bad floor

Have a job where an addition was added making a bow up where the joint was. Leveling is probably not an option. Not level either way. Probably 1/4 inch off 6 ft one away and 1/4 inch per 6 ft off the other way. Any ideas? floor 1.pdf
 
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Old 03-20-15, 02:29 PM
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A picture would have been more appropriate. http://www.doityourself.com/forum/el...rt-images.html
I can't tell if the floor changes direction or if it has a hump in it. To fix it correctly, the "wall" below should be brought in line by lowering it. If that is not an option, terminating the flooring in the opening and using a transition strip may work.
 
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Old 03-20-15, 02:49 PM
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here it is. Didn't realize I had the picture. Where the ply meets the vinyl there is a hump. The boards will be running toward the doorway Name:  transition.jpg
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Old 03-21-15, 05:36 AM
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Leveling is probably not an option.
That is a silly thing to say. Why would it not be an option. It's like saying I want to build a shed but framing it is not an option. Doesn't make any sense.

What direction do your floor joists run in? Is the hump where the smooth in the picture meets the cross pattern on the right side? and can you be more specific as to which way the flooring planks will be orientated. Going toward the door can be interpreted several ways.
 
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Old 03-21-15, 08:02 AM
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Planks are lengthwise towards doorway. Hump is where plywood meets vinyl or as you say where smooth meets pattern. Joists run same was as new floor
 
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Old 03-21-15, 08:14 AM
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If the vinyl is removed what does it do to the picture of things? Make the hump even worse? Some vinyls are perimeter glued only which would make the edges seem thicker than the middle. May account for some of the bump.

Where will the laminate transition to another floor type? At the door on the right or the hall in the back of the picture?
 
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Old 03-21-15, 09:10 AM
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removing vinyl would make worse I think. the whole room will be the same floor with transition to same type of laminate, but different color through large doorway in back of columns. (kitchen). Both sides of that hump are unlevel in opposite direction by about 1/4 in per 6 ft.
 
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Old 03-21-15, 09:19 AM
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Common practice with vinyl is to have a 1/4" of underlayment put down first to create a smooth surface. Vinyl has a nasty habit of showing any imperfections found underneath it. Therefore a very smooth underlayment is put down first. If this underlayment is present, and everything is removed, it would result in one side being low enough to skim coat and level it out.
 
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Old 03-21-15, 10:25 AM
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the floors are even, just unlevel in opposite directions where they meet. Removing vinyl part would not make it any more level.
 
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Old 03-21-15, 01:11 PM
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That is not what I asked. Is there a 1/4" plywood underlayment beneath you vinyl? I am not trying to make it level by removing the vinyl. I am trying to make it substantially lower so that we can build it back up so that it IS level. I don't want it at the same height initially, I want room to build it up. We need to think outside of the box in order to correct a hump without spending the better part of a day trying to sand plywood down to make things suitable for your laminate.
 
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Old 03-21-15, 02:37 PM
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not sure whats under but I would believe it's 1/2 sanded plywood. Even if I did what you say, there is still the other side that is not level.
 
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Old 03-21-15, 05:49 PM
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Which way will you be running the flooring? Across the unlevel part or along with the bow? I'll have to concede to your title. I wouldn't lay laminate on a GOOD floor, much less a bad one due to problems like you have encountered. Engineered click lock flooring may be a little more forgiving.
 
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Old 03-22-15, 04:11 AM
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boards were to be going a across the bow, not parallel. This is what they want. I think I can talk them into laying it the other way if you think that's better.
 
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