Why 2x4's?

Discussion in 'Home Theater Projects' started by Steve James, Apr 17, 2003.

  1. Steve James

    Steve James Extra

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    OK, this may be a silly question, but why frame out using 2x4's or 2x6's, instead of just using furring strips attached to the concret block walls with rigid insulation, then drywall when finishing a basement? Is it just for accoustics?

    Thanks,
    Steve
     
  2. Tom Moran

    Tom Moran Agent

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    I'm not sure there are any acoustic benefits to studs vs. furring strips but I would expect that you might have a difficult time meeting current building codes for R value of insulation with anything smaller than about 2" of rigid insulation. Also keep in mind that you need to wire an outlet roughly every twelve feet to meet electrical codes and doing this without stud walls might be difficult as well.

    If you are not going to get your space inspected these might not be issues but if you are I would check local building codes first.

    Tom
     
  3. Dave Milne

    Dave Milne Supporting Actor

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    Tom's right. I used 2x4s so that I could fit R19 insulation (for thermal, not acoustic, reasons. By itself block is a poor insulator; like maybe R3). More importantly, it could be wired like a conventional wall. With furring strips, you would need to run the wire inside the block and knock out openings for electrical boxes... a real pain.
     
  4. Steve James

    Steve James Extra

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    OK, just saw it in a book. I have an issue on one wall due to the vents above and a pipe that runs almost the length of the wall allowing no place along the 18' wall to secure the top plate to the celing joists. I have no idea how to frame that wall with reg 2x4's
     
  5. NathanH

    NathanH Stunt Coordinator

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    You could build a soffit around the pipe and vent, then attach the frame to the bottom of the soffit. I'm going to have to do that in a few places in my basement.
     
  6. Steve James

    Steve James Extra

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    hey nathan, i think i responded to a post of yours in the AVSforum...

    I'm looking to do the same thing you are, with the PT lumber base plate, then metal everywhere else. Any sturdiness issue with attaching the wall to the soffit? Do you attach the underside of the soffit to the concret wall?

    thanks...
     
  7. NathanH

    NathanH Stunt Coordinator

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    Indeed you did! Thanks [​IMG]

     
  8. Steve James

    Steve James Extra

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    thanks nathan, by the way, i didn't get your zip file on AVS...
     
  9. NathanH

    NathanH Stunt Coordinator

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    I'll repost [​IMG]
     
  10. Wayne A. Pflughaupt

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  11. Steve James

    Steve James Extra

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    Ok, check out the pics below to see what issues I will have. also, I just measured the height, and looks like I have to go the no permit route due to the 7 ft I will have in the theater area. The rest of the basement will be 7'8"...

    My Basement Issues
     
  12. NathanH

    NathanH Stunt Coordinator

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    Finally got them uploaded here.

    Can't remember which response gets posted on which forum.... Hmmmmmm maybe I should create something that will post to both forums..... hmmmmmmm
     
  13. Steve James

    Steve James Extra

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    thanks Nathan, your pics are going to be a big help. What will be the height of you ceiling?
     
  14. NathanH

    NathanH Stunt Coordinator

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    Let's see...

    From concrete to ceiling joist is 7'10"

    Minus the 7/8" flooring

    Minus 3 or 4 inches for the drop ceiling

    I guess about 7'6".
     
  15. Mark McGill

    Mark McGill Stunt Coordinator

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    In most parts of the country (if not all), you must allow a dead air space between the foundation and your insulation. The reason for this is moisture. Cement is like a sponge which means it holds a lot of water. Make sure that your foundation is water-proofed, preferably from the outside. Now keep you studs away from the foundation a couple of inches. When you insulate make sure you don't push the insulation tight against the wall. Now you can use a vapor barrier over the studs and then drywall. If you live a very wet climate you can also water-proof directly on the cement in addition to the above.

    For the sill plate, make sure you use pressure treated lumber. Most codes require this.
     
  16. Kurt_M

    Kurt_M Auditioning

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    Looks like a lot of the same issues I ran (am running) into. To frame around the ducts I would frame the walls underneath the ducts and nail to the floor. I would also get some pliable metal strips that can be formed around the 2x4's and screw them into the concrete block close to the top of the wall every 4th or 5th stud. I would even consider a double top plate so you can attach the soffitt to the wall framing as well as have some wood left over to screw the drywall to.

    I made the mistake of buying 2x4's, bringing them home and start nailing right away. I've learned to let the wood "rest" where they will be used so they get acclimated to the climate. The wood I used must have lost moisture and some pieces started to bow which messed up all my measurements.

    Just remember that planning is the worst part but once you get started it will go quickly.

    km
     
  17. NathanH

    NathanH Stunt Coordinator

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  18. Mark McGill

    Mark McGill Stunt Coordinator

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    One other option for the soffits is to use steel studs. They are fairly easy to work with and are always straight. I used this for my soffits. Basically I dropped the ceiling about six inches all the way around the room except in the front. This way I could hide the ducting and a beam and it looks even or symmetrical. I then put rope lighting up in the soffit for the indirect look with crown molding to finish it. The soffits are also a great place to run wire. If I can figure how to post a picture I will.
     
  19. Steve James

    Steve James Extra

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    I'm planning on using steel studs all the way around, so I'll probably frame the soffit with steel. Problem is my finished ceiling height is going to be a little more than 7' (which, I found out, does meet code in my county). Right now, I can barely stand under the duct, and I'm 6'6".

    I like the idea of attaching a PT plate to the cinder block wall, then attaching the framing to that. Would I put the PT plate on the wall right under where the bottom of the soffit will be, and attach both the bottom portion of the soffit, and the top plate of the wall to it?
     
  20. Mark McGill

    Mark McGill Stunt Coordinator

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    If I understand you correctly, don't attach anything to the cinder block. The studs need to be away from the wall so that moisture doesn't contact it. This means that if you are using 2x4's, you should keep it out maybe an extra three inches so that your insulation doesn't touch the cinder block. So to make it easy you attach your sill plate to to floor and frame straight up. Rent yourself a hilti nail gun and shoot it in or, some people have used a constuction adhesive.
     

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