New answers tagged carpet
If you choose to use plywood, go with the 3/4" T&G for the layer under the carpet. The trough were the heat pipes used to be can be spanned by the 3/4" plywood too. Also since the carpet compresses under foot, keep the plywood below the hardwood layer about 3/8" or so lower. That way when you step there, the transition will feel level.
have a look at this page : http://www.tepih-servis.com/en/carpet-service-belgrade/unpleasant-smell-of-new-carpet/479 a suggestion there is to sprinkle baking soda on it, leave it overnight and vac it up in the morning.
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