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I currently have carpet in my 1998 home. The carpet needs replaced, and I have many squeaky spots and a few uneven spots. I am planning on installing laminate in the entire upstairs level. How would I ensure no squeaks or uneven spots return?
 

· A "Handy Husband"
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What is under the carpet? What is the subfloor consist of and how thick?
If your subfloor is not level, the laminate will fail
 
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Also just a bad idea to install laminate on a second floor.
Loud to walk on and a nightmare to trim out at the top of the stairs without creating a trip hazzard.
This has been discussed many times here on any DIY and all the real flooring guys agreed.
 

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We really need to know what size and type of plywood the subfloor is, T & G or not, how far apart the nails are, size and spans of the joist to be able to suggest a fix for the squecks.
 

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just get a screw gun and construction adhesive....one person walks on the bare subfloor looking for squeaks, and has the screw gun and screws, the other person is in the basement if its not a finished ceiling, with the adhesive, when you find a squeak, pump some adhesive along the plywood and floor joists from below and screw the plywood from above, squeak problem cured, for the uneven areas, either fill in with some leveling compound or use a belt sander to even it out...
 

· A "Handy Husband"
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just get a screw gun and construction adhesive....one person walks on the bare subfloor looking for squeaks, and has the screw gun and screws, the other person is in the basement if its not a finished ceiling, with the adhesive, when you find a squeak, pump some adhesive along the plywood and floor joists from below and screw the plywood from above, squeak problem cured, for the uneven areas, either fill in with some leveling compound or use a belt sander to even it out...
The poster is on the second floor, no access from below. The best he can do is screw it down. He needs to address the unevenness.
 

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Before you start with laminate, it is important to prepare the subfloor for the underlayment. Start tapping down the nail heads, if any, and slowly walk around the area. If you feel or listen any squeaks, drive a 2-inch drywall screw through the subfloor and you can drive the screws into the joists later.
 
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