Overkill to add additional sub floor under new Laminate install?

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  #1  
Old 06-19-13, 07:51 AM
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Overkill to add additional sub floor under new Laminate install?

small 2 bedroom 2 story condo/townhouse built in 70's
Will be installing Mohawk lam individual plank flooring on 2nd level

The floor dips and peaks exceed laminate flooring's mfg stated tolerance. Also the existing subfloor doesn't use tongue and grove so it flexes vertically quite a bit where plywood sheets meet between floor joists, lots of squeaking—also warped in places. All in all, existing subfloor workmanship is not the best, there are a few places with 1/8 to 1/4 inch gaps between flooring sheet joints.

I'm thinking of doing the following to prep floor

1. plane off existing ply wood joints where sheets meet unevenly
2. add additional screws into floor joists
3. fill in dips with portland thin-set or whatever is best filler
4. add another layer of tongue and grove flooring to get even surface and improve stability over existing subfloor joints

Questions:


A. Are there other things I should be doing (or not doing, or doing differently from above)?

B. What is a recommended compound to fill in low spots? (product and brand name would be appreciated if allowed by forum rules)

C. Is adding new additional tongue and grove sub flooring overkill? Would it be a good idea, or the wrong thing to do? Will it add too much additional weight to the floor + laminate and underlayment?

Any and all advice is appreciated.
 

Last edited by hutgm; 06-19-13 at 08:14 AM.
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  #2  
Old 06-19-13, 08:14 AM
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Not over kill at all.
I'd use 3/4 Advantech.
 
  #3  
Old 06-19-13, 08:17 AM
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Any suggestions for a product name/brand to fill in dips in existing sub floor?
 
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