How to level floor for laminate flooring?

Old 07-06-06, 01:17 PM
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Question How to level floor for laminate flooring?

We want to install laminate flooring in our dining room that is 18'x21'. The problem that we are having is that about 6' into the room is a flooring joist that raises the floor up 1/2" higher than the rest of the floor. When you lay a board across the flooring joist it is like a teeter-totter. My husband has tried to sand it down as far as he can but it just isn't enough. I was wondering how would you go about leveling it with roofing felt? how do you go about feathering it? how big do you cut the layers of felt? do you lay the roofing felt down & get it as flat as you can then put down the blue underlayment, then the laminate down? or can you put down the blue underlayment, then the laminate then slip roofing felt under the areas that need it right under the laminate flooring? does it make a difference if the roofing felt is right next to the laminate? or should it be next to the floor??
Any other ideas on how we can flatten this floor would be MUCH appreciated!

Thank You! Sarah
Old 07-06-06, 02:58 PM
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This just doesn't sound good.

Are you sure about this being a joist?

Since you say this is the dining room, I would guess that it's the first floor and there's nothing below that would keep you from examining the joist. Is there a basement or crawl space?

Joists are usually about 16" o.c. and if there's just a single joist that is 1/2" higher than the others then you would have a very noticable bump going from level up 1/2" in only about 16" and then back down to level with the rest of the floor.

However, if this is an area where there's a cantilever then it's very possible that the transition is smooth from the wall out to the 6' line and then back down to the other side of the room. You really should have an Architect or Engineer look at it to determine exactly what's happening. Your proposed solution of using building felt to build up under the laminate is a bad idea. The subsurface needs to be level and firm. What you've described indicates a basic defect that needs to be properly fixed.

Old 07-06-06, 03:58 PM
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Mis specified product for the substrate conditions that exist.

2 choices...

Tear out and rebuild the subfloor to make it flat enough for laminate flooring.

Forget laminate flooring, and install carpet.

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