Raising Subfloor before laminate?

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Old 06-02-13, 01:27 PM
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Raising Subfloor before laminate?

The drop in flooring from my Foyer to living room is 1.5 Inches. I have Italian Porcelain in my Foyer. I have removed Carpet and planning to put in a laminate in living room. Does it make sense to put a 5/8" Plywood before laying the laminate? That will make the drop in floor height to near 3/4".

LR is 16 X 19. Does putting a lot of plywood will result in extra load on the beams?
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Old 06-02-13, 02:17 PM
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The extra layer adds strength to the floor. It will stiffen it up. I would add another 3/4" to minimize the differences even more. You probably don't need the extra layer for anything other than the trip hazard. Will it create a trip hazard at another location or doorway other than at the foyer?
 
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Old 06-02-13, 02:35 PM
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Thanks for the response. No; there is no other entrance. This is the only place. Even if I add 3/4" plywood, there is still another 3/4" difference in floor height. You think it is still worth?
 
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Old 06-02-13, 02:50 PM
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It will shrink as you install the flooring

3/4" added subfloor
1/8" laminate underlayment sound deadening
1/4" laminate
1/4" threashold transition piece to cap off the edge of the laminate and maintain the expansion gaps required
 
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