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I would like to know if there are any impact tools that I need to make the subfloor permanent or stable to avoid sound later. I don't want to use DRIcore for this matter.

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I helped finish a basement 2 years ago with what I thought was the best carpeted floor I have walked on.

Steps

  1. Make sure floor is flat. It doesn't have to be perfectly flat but pretty close. Level doesn't matter that much. A slight pitch to basement drain is fine. Do not level this pitch. You should be "leveling" things because of buckling, big cracks, "steps"...
  2. Lay down 1" rigid foam sheets - the bigger the better.
  3. Tape the seams.
  4. 3/4 inch playwood on top of foam - the bigger the better. Lay it staggered so there isn't a giant seam.
  5. Predrill about 8 holes in each piece of plywood (3-2-3).
  6. Predrill 1/4" countersink holes - tapcon screw won't sink on their own.
  7. Drill tapcon screws into concrete floor. The screws should be about 3 inches long - 1" foam + 3/4" plywook + 1" in the concrete (1/4" for misc gapping) - you can use 2 3/4 if you want too. I would not go longer than 3 inches though - you do not want to have issues screwing these in. The depth is just to keep the plywood flat not to keep it from moving. Laying the sheets right next to each other should do that.

You can lay carpet or engineered hardwood on this. Provides a thermal break, a way for water to escape, and is virtually noise free. Some people will say you don need the tapcon screws. You do. I have personally seen a short period of moisture make 3/4" plywood curl up in a basement after it has been down for years.

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+1 question - tongue-and-groove or square edge? H-clips? H-channel? –  mike Jul 22 '13 at 4:12
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We just used square edge and no clips. I wouldn't use clips/channels. First they are metal and you have something that could rust going into a potential moist environment. Also you are going to have a ridge where these are. I know it is a slight ridge but it is still there and I am sure you might feel it depending on what you lay on it. –  DMoore Jul 22 '13 at 4:22
    
can't you put carpet directly on basement concrete floor, provided it is dry ? –  amphibient Nov 29 '13 at 15:54
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@amphibient - Yes - was giving an alternative to dricore - that is cheaper, easier, and in my opinion better. Most basements I have done in my area we just lay carpet down on a good pad directly on concrete. –  DMoore Nov 29 '13 at 20:41
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