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Old 09-17-2014, 05:59 AM   #1
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Default Carpet Subfloor Question

We're putting in new carpet with a subfloor. The old stuff was just glued down to the concrete. My question is, what should we use for the subfloor? I've heard of 2 layers of 1/2" OSB. I was also told to use 3/4" MDF. (2x4's laid face down 16" on center)

Does anyone have any suggestions one way or the other? We're obviously trying to work within a budget but we want it done right the first time.
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Old 09-17-2014, 07:10 AM   #2
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Email scotty Ernest. His temporary track for the IIC is awesome
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Old 09-17-2014, 07:32 AM   #3
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The 5280 guys just renovated their track

Loads of info & drama HERE
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Old 09-17-2014, 07:36 AM   #4
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Here's a link to the pics of the subfloor we put down at NORCAR at the Gate:

https://www.facebook.com/#!/20379807...type=3&theater

We used plastic, 2x4"s, then 2 layers of 7/16" OSB, then lots of sanding
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Old 09-17-2014, 09:02 AM   #5
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The 5280 guys just renovated their track

Loads of info & drama HERE
Wow!
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Old 09-17-2014, 10:16 AM   #6
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Wow!
Those guys are pefectionistas, and that track is pretty bitchen
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Old 09-17-2014, 10:58 AM   #7
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Here's a link to the pics of the subfloor we put down at NORCAR at the Gate:

https://www.facebook.com/#!/20379807...type=3&theater

We used plastic, 2x4"s, then 2 layers of 7/16" OSB, then lots of sanding
Smoothest straightaway EVER....

The NORCAR guys did an awesome job.
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Old 09-17-2014, 12:41 PM   #8
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3/4 tounge and groove. 2x4 16 on center. perfectly flat, 5 years down now.
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Old 09-17-2014, 01:21 PM   #9
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2x6 I-joists w/3/4" tongue and groove OSB, 16" OC. Build the perimeter so the floor is completely elevated by 2". Shim every 10 feet up the joist to keep it level. The joists can be just about any length and when done with this spacing there is no bounce and you can build it laser flat. If permanent, use liquid nails to hold the top down. Predrill all screw holes and sand lightly after anchoring.
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Old 09-17-2014, 01:36 PM   #10
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Here was ours when we built it 3 years ago. 3/4 tongue and groove 30year Advantec floor under layment. 2x6's, cracks and low spots after leveling were bondod up and sanded smooth. Our floor was horrible so we had to use lag bolts to level the floor due to a 4" difference from one end to the other. Came out perfect.

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Old 09-17-2014, 09:39 PM   #11
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Wow!
Nicest, most successful track in the country. We're passionate about what we do. Perhaps too passionate at times.
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Old 09-17-2014, 10:13 PM   #12
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I would recommend 2 layers of non tongue and groove OSB 3/4" with alternating pattern from first layer to second so all joints overlap by 4ft. Screwed together with about 40-50 screws per sheet. If there's any major high or low spots glue and shim.

Not all OSB sheets will be the same thickness so check when placing. Thinner sheets will need to be placed on outer edges were cars normally don't drive. At 5280 we didn't think about this issue so we had some spots that needed sanding. We rented a large floor sander for this job.
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Old 10-24-2014, 02:11 PM   #13
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I do construction part time with my father who has been doing it for 45 years. Never have I ever laid joist on the long edge. They will bow and flex more in that direction. Why would you lay them down like this verses the standard of vertical? 2x4 or 2x6 should be more than enough support with 3/4" tongue and grove osb. Use a strong adhesive between the joist and osb, then screw, not nail, the osb to the joist. Screws are overkill, but it will hold them down better. Finally get a floor sander to smooth everything out.

Of course that is all after you have set a level for the top of the joist. I look at like building a deck. Set some 4x4 or 6x6 post if you just feel the need to over do it, 6" tall every 8 feet and set the top of the joist level just above that to give some wiggle room for uneven concrete. When the structure is finished it will be so heavy, it wont go anywhere. Everyone seems to be making this way too hard IMO.

I also don't understand the need for two layers of ply wood. We aren't parking real cars on it. All I could see that doing is creating more places for the floor to separate and create high spots. If the first layer isn't level them the second will be worse
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Old 10-24-2014, 02:20 PM   #14
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I also don't understand the need for two layers of ply wood. We aren't parking real cars on it.
Have you looked closely at some of your fellow R/C racers over the past few years?
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Old 10-24-2014, 02:41 PM   #15
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Very true. Gotta love good ol' MERICA' home of the whopper.
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