Flooring question

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  #1  
Old 10-15-10, 07:16 PM
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Flooring question

I am renovating a early 60's house for my parents to move into. Problem is that in the 60's a sunken room was in style but with age it becomes a fall hazzard. I plan to build a false floor on top of the existing floor which is a 7" drop from the remaining house. With that given distance would there be a need to insulate the floor for sound proofing. I will be using 2X8 joist and 3/4 OSB. The finished floor will be 3/4" T&G. The area is 15'X23'
 
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Old 10-15-10, 08:03 PM
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I would think if it is insulated well, now, no further insulation would be necessary. If you have a 7" drop at present, the 2x8 is somewhere in the neighborhood of 7 1/2" itself, then you add 1 1/2" of overlay on top of that you will have a 9" high floor, so you will be trip factoring in a 2" rim. Consider 2x6 framing with the two layers for your 7" fill.
 
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Old 10-15-10, 08:44 PM
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I had already taken this into consideration by trimming down the 7-1/4" joist to compensate. With the added 3/4 subfloor the 3/4" T&G will lay on the adjoining subfloor correctly.
 
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