Sub flooring, to glue or not to glue

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  #1  
Old 01-07-14, 10:45 AM
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Sub flooring, to glue or not to glue

I bought my house a year ago and started renovations in the master bedroom. I removed the wide pine flooring and the rough cut board sub flooring (took the floors down to the joists.) I installed 1/2" sub flooring, glued and screwed. Now i will be installing hardwood flooring eventually, but my problem now is that the old rough cut sub flooring is higher than the new sub floor. (i cut the old sub floor that had walls on it, to the nearest joists) My question is, when i add another thinned layer on top of the new sub floor, should i glue and screw it as well or, is there a different method i should use?

Tim
 
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Old 01-07-14, 12:37 PM
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Welcome to the forums! 1/2" is too thin for subflooring. Should have been minimum of 3/4". You can't add 1/4", but another layer of 1/2" may work, depending on joist size, spacing and longest unsupported span. What is the difference in height? Is this a demarkation point (doorway) or do you plan on installing across it?

No glue on second layer and no screws in joists from second layer.
 
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Old 01-07-14, 12:55 PM
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my mistake it was actually 3/4" sub flooring, and i am probably off by about 1/8" - 1/4" on one side of the room. It does go in front of the doorway but does not span to the hallway
 
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Old 01-07-14, 01:03 PM
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You say it is off on one side of the room? How about at the transition at the doorway. Does it return to normal? Pictures may help, too
 
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Old 01-08-14, 08:43 AM
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I was not able to take pictures last night, however on the interior wall the original sub floor is a little higher, on the exterior walls the new subfloor goes right to the outside wall.
 
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