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pslate: Definitely not going to be our last home, we're hoping to be here less then 5 more years. I don't want to build a time bomb for the next owner, of course, but...Does IIC just deal with sound due to impact? I've seen STC, but not IIC. I hear you regarding workmanship possibly killing the effort, wish my wife did as well. Bryan: what are some methods of adding mass to the subfloor above? It is constructed of 2x10 lumber run at 45 degrees WRT the joists. Oak floor attached to it, toenailed through the tongues of the tongue and groove sides. I'd thought about adding a second layer of drywall (or homasote), but have concerns about that much weight hanging from the furring strips.To give a sense of scale to the budget, my query is dealing with an increase from $150 for fiberglass insulation to about $300 for rockwool.
in the process of remodeling the basement in our duplex.The basement ceiling is unfinished currently, with furring strips attached to the bottoms of the floor joists in a perpendicular orientation. The flooring above is 1" oak.My plan is to drywall the ceiling with one thickness of 1/2" drywall, glued and screwed to the furring strips. I also plan to fill the cavities between the joists with insulation to assist in blocking sound transmission through the floor
A solid core wood door on the stairwell would be a better investment IMO.
If the basement is open, that's going to be a huge source of noise transfer and likely, standard insulation, slats, and regular drywall is your best reasonable option. I wouldn't bother with a ton more if the rest is open and the sound is just going to to right up the stairs. A solid core wood door on the stairwell would be a better investment IMO.Bryan
We're too far in at this point to alter the construction of the sub-ceiling (guess that's what you'd call the furring strips, etc.) without significantly adding to the cost and time table, neither of which are going to go over well with the "project manager". Again keeping the budget in mind, if I were to double the drywall only above the listening area, would that have any impact on the sound heard above? Or would the sound just find another path to get upstairs? The listening area is the front half of the basement, which has a completely open floorplan. The master bedroom is two stories directly above it, which is where the annoyed typically resides at night when I'm listening. The ceiling/floor construction I have with one layer of drywall attached to the joists would have an STC rating of 38 according to one site I found. It claims insulation would add another 5 to that rating. Any truth to that in your experiences?
I put insulation in my ceiling, and it did help a little. However, if I had it to do over again, I'd have put in hat channel and isolation. Every time the kids put something on the tile floor in the kitchen, the sound easily traveled to the basement. The only way to reduce that sound is via decoupling. Something like this is what I mean:http://www.soundproofingcompany.com/soundproofing101/furring-channel-with-resilient-sound-clips/I also got two heavy, solid doors. I ordered them from a local company and had them install rubber around the doors. Add an automatic door bottom, and that will help too:http://www.soundproofingcompany.com/soundproofing-products/door-bottom-jamb-stop/automatic-door-bottom/
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