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Old 03-10-2011, 06:22 PM   #16
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Where to start - Hardwood floor installation


My instuctions say pretty much the same thing. It says "Stiffening may require the additon of a second layer of subflooring material to bring the overall thickness to at least 1 1/8". This will be my first hardwood install, so I'm no expert, but I would think if you don't follow this instruction the floor will flex and may make noise.

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Old 03-10-2011, 09:11 PM   #17
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Well, we will have to add another layer to the subfloor, probably 1/2 inch plywood.
Any ideas how it should be lay down?
We are thinking it should be glued and screwed down, and it should be staggered on top of the existing one.

  • Any specific type of plywood we need to use?
  • Should it be glued? If so, what adhesive is recommended?
  • Should it be screwed to the joists? or just to the first layer of subfloor?
  • Should it run perpendicular to the existing subfloor or in the same direction of the existing one?
  • If screwed, what kind of screwsain should we use? (star, square, philips)
  • If nailed down, what kind of nails should we use and how long? Can the be longer than the thicknes of the overall subfloor? (3/4 + 1/2)
  • If stapled down, what kind of staples should we use and what length?
Thanks again!

Juliana
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Old 03-11-2011, 07:02 PM   #18
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Where to start - Hardwood floor installation


I was hoping a flooring pro would respond to your last question, but I would think you would want to get going on it soon. Have you asked the salesman who sold you the floor? I checked my copy of the insturctions and it only says to stiffen it properly, not much help. I don't know what the proper process is, but I have some advice. Using square drive screws works better than phillips. You have to put a lot of down force on a phillips screw or it wants to pop out and strip the head, square drive screws don't do this. I think you are on the right track with glue and screw with the joints offset from the lower subfloor. I would use a construction glue that is recomended for wood and use a v notch trowel to ensure even coverage. I would also use a heavy roller or weights the press it down. I had to replace my subfloor and I used 3/4 t&g plywood that had no knots on the top side. I used a counter sink bit on one drill and a square drive bit on a second one, because I wanted the screw heads to be just below the surface so that they don't contact the tigerwood and make noise. The sister site contractor talk.com has a thread about problems with spliting tigerwood when nailing it down, you might want to read this. It looks like you will be putting your floor down before I do, I still don't have my tigerwood. Please keep the thread updated with your progress.

Last edited by cep89; 03-12-2011 at 07:46 PM. Reason: spelling
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Old 03-12-2011, 08:34 AM   #19
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Where to start - Hardwood floor installation


Quote:
Originally Posted by cep89 View Post
square drive screws
do you mean "Robertson" screws??

I know that the US really hadn't adopted them and always favoured phillips, but "robertson" is a superior screw for driving... here is Canada these are almost exclusively used for decking, flooring, etc...

rod
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Old 03-12-2011, 07:34 PM   #20
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Yes, I didn't mean to slight Mr. Robertson, it's just that that name is not in common usage in the US and I didn't want to confuse anyone.
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Old 03-12-2011, 08:19 PM   #21
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Where to start - Hardwood floor installation


Isn't that Mrs Robinson?

JulianaCR, how sure are you that your floor joist are at 24 inch c to c. And if they are, what sub floor do you have already, if its 3/4 ply is it real bouncy..

And at 24" C to C what size and grade of joist are they?

Seems like the spans that you have, 24" centers is rather wide.

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Old 03-14-2011, 11:39 AM   #22
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Where to start - Hardwood floor installation


Yeah, I know is kind of weird the 24'' C on C spacing.
Well, we find out this weekend that there is one side of the house that seems to have joists at 12'' C on C, but the other side of the house seems to have 24'' C on C. Not sure what size the joists are. We try to find other studs drilling some holes in between the 24 joists to no avail on the size of the house that has the 24'' spacing.

We have a 3/4 inch OSB subfloor at this point and we will be adding a 15/32 in plywood to reinforce it.

Juliana
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Old 03-14-2011, 02:22 PM   #23
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Where to start - Hardwood floor installation


Are you posting the same questions on enough sites ?
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Old 03-14-2011, 03:56 PM   #24
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I've them posted on 3 different sites.
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Old 03-14-2011, 04:33 PM   #25
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The fact that you have variation in your floor joist would lead me to believe that you also have variation in direction as well.

I would imagine that the direction of the floor joist for the area on the right of the stair is perpendicular to the area on the left unless there is a wall midpoint between the right parimeter wall and the stairway on the first floor running front to back.

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