Plywood Sub-floor Uneven for laminate flooring

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  #1  
Old 01-04-15, 06:19 PM
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Question Plywood Sub-floor Uneven for laminate flooring

I started laminate flooring job. I removed an existing carpet from a bedroom to lay laminate flooring. When I checked the sub-floor (plywood) levelness, the sub-floor was uneven. There are 11 joists underneath the sub-floor that run east to west (one edge to the other), parallel to each other. The 1st joist (north end) and the 8th joist (to the south) are raised to 1/4" to 3/8" higher than the rest of the joists, making these two areas a crowned shape rather than a levelled plane. After the 8th joist, there are 3 more joists before the edge or the wall.

I want to make the sub-floor flat near to perfect to make the laminate flooring last long. Would it be good idea to fasten a thin (1/4" plywood or tempered board) layer with nails wherever there is depression and fasten another layer of 3/8" plywood with nails on top of thin layer and the sub-floor covering entire room, which I think, would even out the unevenness of the sub-floor. Can you give any ideas/suggestions on making this sub-floor even and suitable for laminate floating floor, I appreciate your help. Thanks.

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Old 01-04-15, 08:56 PM
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Welcome to the forums. What you would be building is a pea under the mattress. Adding strata is not the answer. Determining why the subflooring is wonky is primary, and fix it. Uneven joists. Swollen subflooring. Poor fastening.
 
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Old 01-10-15, 09:14 AM
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Thank you for your suggestion. I wanted to have a quick and easy solution. The home is 38 years old, subfloor and home structure is very sound and solid, there may be some settlement in the structure, the only problem is it is unlevel to the extent of an half inch over 8 foot area in the room. There are some examples of using shingles, door skins, thin plywood etc.. for evening out the unevenness in the subfloor over the internet/youtube. I am wondering how good those solutions be.
 
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Old 01-10-15, 03:14 PM
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Quick, easy solution would be to pour Self Leveling Compound over the floor, screeding it a little as it finds its own levelness. Once it has set, you can apply your vapor barrier/underlayment then your laminate.
 
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