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Old 10-05-2006, 10:44 PM   #1
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Hardwood over hardwood?


I just put an addition on my house and the new subfloor is flush with the old oak floor. I am installing Brazilian Cherry and want to have a seemless entry into the new room. Can I place the new flooring over the old in the existing room?

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Old 10-06-2006, 06:22 AM   #2
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Hardwood over hardwood?


In a word NO! The reason is you could end up with excessive gapping of your new floor when the humidity and moisture make the floor under it expand and contract which does not happen with plywood or osb.

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Old 10-06-2006, 12:51 PM   #3
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Hardwood over hardwood?


i will have to argue that and say yes. as long as the new floor will be perpendicular to the old oak floor. if not then you can either add thin plywood over everything, or remove the oak and install 3/4 plywood. in my house i have an oak floor that was laid directly over my pine tounge and groove subfloor, at least 50 years ago. put it this way, when we refinished it 3 years ago it was the last time it could be sanded. it is still nice and tight and flat. hell about a 4' circle of it was water damadged when i bought the house. swelled and buckled up. i let it dry out and most of it went back down, i had to replace maybe 1'x2' of that section. is the pine sub floor considered hardwood? no, but it is tounge and groove boards, much like hardwood. there will be the same type of expanision and contraction. in the upstairs of my house i put a rosewood floor over 11/32 plywood over my pine subfloor. i used the plywood as a base as i wanted to run my rosewood the same direction as the pine tounge and groove. if i wanted to run it perpendicular to the pine i would have not used the plywood. my rosewood floor is flat like glass. when iinstall my new floor dowstairs im going right over the old oak floor that has been sanded to roughly 3/8" and it will be ok. i used to do hardwood floors and my best friend still does them, owns his own wood floor business. we have both been on refinish jobs that were hardwood over hardwood, over subfloor. they were just as tight as any floor that was over plywood. or any other solid subfloor. use a good amount of staples and you should be fine. is it the best way to do it, no, but it can work.
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Old 10-06-2006, 03:10 PM   #4
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Hardwood over hardwood?


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Originally Posted by jamesdart View Post
i will have to argue that and say yes. as long as the new floor will be perpendicular to the old oak floor. if not then you can either add thin plywood over everything, or remove the oak and install 3/4 plywood. in my house i have an oak floor that was laid directly over my pine tounge and groove subfloor, at least 50 years ago. put it this way, when we refinished it 3 years ago it was the last time it could be sanded. it is still nice and tight and flat. hell about a 4' circle of it was water damadged when i bought the house. swelled and buckled up. i let it dry out and most of it went back down, i had to replace maybe 1'x2' of that section. is the pine sub floor considered hardwood? no, but it is tounge and groove boards, much like hardwood. there will be the same type of expanision and contraction. in the upstairs of my house i put a rosewood floor over 11/32 plywood over my pine subfloor. i used the plywood as a base as i wanted to run my rosewood the same direction as the pine tounge and groove. if i wanted to run it perpendicular to the pine i would have not used the plywood. my rosewood floor is flat like glass. when iinstall my new floor dowstairs im going right over the old oak floor that has been sanded to roughly 3/8" and it will be ok. i used to do hardwood floors and my best friend still does them, owns his own wood floor business. we have both been on refinish jobs that were hardwood over hardwood, over subfloor. they were just as tight as any floor that was over plywood. or any other solid subfloor. use a good amount of staples and you should be fine. is it the best way to do it, no, but it can work.
You know you are probably right. The reason I gave the answer I did is I look at each question and situation as would I do it as a professional? and how would I do it as a professional? and give my advice accordingly. The reason I said no is simply if he called me and asked me to do it I would refuse.
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Old 10-06-2006, 10:56 PM   #5
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Hardwood over hardwood?


Thanks for the advise. The new floor will be perpendicular to the old.
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Old 10-09-2006, 06:16 AM   #6
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Hardwood over hardwood?


I have a crazy question. Why wasn't every effort made to make the new floor level with the old floor.
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Old 10-15-2006, 11:06 AM   #7
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Hardwood over hardwood?


Contractor error. By the time it was noticed the basement walls had already been poured and the floor joists were in place.

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