I will be building a new 2 story house and will have an unvented attic with CC foam. My question Is can I use Rockwool in between the 1 st and 2nd floor to help with soundproofing? Or will I have moisture problems?
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You should not have issues with moisture. (assuming you plan to heat and cool both floors most of the time at similar temperatures)
The reason vapor barriers are needed in exterior walls is to prevent air/vapor flow into places where the insulation would be at temperatures below the dew point, from places where the humidity is above the dew point.
You should plan for ventilation in areas which generate lots of moisture, like bathrooms.
Acoustically insulating between floors.
Insulating between the floors in your home offers both heat and sound insulation benefits. It is also relatively simple to do with the right tools. Products such as JCW Impactalay Plus Acoustic Floor Insulation are designed to provide sound insulation that delivers that valuable peace and quiet we all strive for. With three acoustic layers to combat both impact and ambient sound, this product and others like it have been designed specifically for insulating between floors in your home. Acoustic insulation is relatively easy to install, very effective and great value for money. If it also makes your life quieter and more peaceful!
We insulate our roof and we insulate our walls, but can you insulate between two floors within a house to reduce noise? Putting insulation between the ground and first floor should, in theory, stop sound, vibration and heat from moving between levels in your property. This will also increase thermal insulation for the room above and below, making them more comfortable to be in and quieter too.
By using acoustic floor insulation, you block air cavities between floors that enable ambient sound to travel. You also reduce the space in which joists and floorboards can vibrate which reduces vibration noise. Used in conjunction with the proper pointing tape or gripper strip, this kind of insulation can be a very cost-effective way to insulate your home against noise.
Sound travels in two ways, through the air and physically through impact. Airborne, or ambient noise, would be the noise of a TV or music in an upstairs room or people talking. Examples of impact sound would include the thump of something hitting the floor or the sound of feet or heels walking around upstairs. Effective acoustic insulation needs to be able to handle both types of sound. If you have laminate or wood flooring in upper levels of your home, noisy teens, or just want to be able to have a private conversation, acoustic floor insulation is for you!
You won't have any vapor problems because of insulation added between floors.
A large portion of the sound transmission between floors is caused by the impact of people walking around on the floor. The energy is transferred from the floor to the joists to the drywall. Because of this insulation between the joists is not effective in stopping it. Consider adding a sound absorbing underlayment or decoupling drywall clips (or both) if you are looking for better noise control.
As a side note rockwool is only a little better at stopping sound than unfaced fiberglass. Fiberglass and decoupling clips will be much quieter than just rockwool.