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New Member - Basic advice on partial remodel??

post #1 of 2
Thread Starter 
Hi all, long time lurker first time poster.

In short we have an already 80% finished basement that had a crappy drop ceiling installed. We have ripped the ceiling out and are installing sheet rock with can lights. All walls are already sheet rocked / insulated as shown in the attached picture. (Exterior walls have concrete foundation behind studs and are insulated, all interior walls are single layer of sheet rock and hollow.) The only major change is that the depicted wet bar area is replacing a rather useless storage area. I am on a budget so this can't get too wild.

My #1 concern it to keep as much sound as possible out of the upstairs bedrooms located directly above the west most lower rooms. My current plan is to double layer the entire main room ceiling with 5/8 and Green Glue with R19 on top.

Other items:
- No HVAC ducting to worry about.
- All doors are getting replaced with solid core.
- I am going to be cutting into the existing walls already to run speaker / telco cabling and additional power runs to amp and PC locations.
- Bedroom 1 is getting fully remodeled so the walls and ceiling will be exposed, but I was planning standard single layer of rock.
- Sheet rock is being mounted directly to joists to save head room in main area.

Do you think it would be worth the effort / $$ to double up and GG the east bathroom wall and the east bedroom 1 wall and all the walling in the wet bar?

Is there any point in doubling up bedroom 1's ceiling and walls or will I be fine because of the door isolation?

Any advice would be great!


post #2 of 2

The keys to sound proofing are density and isolation.  Additional layers of drywall will help.  Using sound insulation instead heat/cool insulation will help as well.  Look for the Sound Transmission Class (or STC) number (higher is better) of the materials you are using.  Here are some examples of construction techniques and the related STC.

Wood 2x4's, batt insulation, 5/8" drywall 1 sheet each side: STC 36
Wood 2x4's, batt insulation, 5/8" drywall 1 sheet one side, 2 sheets the other side: STC 39
Wood 2x4's, batt insulation, 5/8" drywall 2 sheets each side: STC 45
Staggered wood 2x4's on a single wall, batt insulation, 5/8" drywall 1 sheet each side: STC 47

Wood 2x4's, dual walls set 1" apart, 2 layers batt insulation, 5/8" drywall 2 sheets each side (outside only, 4 layers total): STC 62

These STC ratings are estimates, your mileage will vary.  Even with sound proofing construction techniques, low sounds will still carry.

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