Author Topic: What's the Best Sandwich?  (Read 4881 times)


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What's the Best Sandwich?
« on: April 03, 2011, 08:56:46 PM »
We're about to sheetrock--new construction hi-end residential, wood framing 16 & 24" oc.

Want to do two layers of ½" board on each side of partition walls and on ceilings, with Green Glue in between to segregate the quiet rooms (bedrooms) from the rest of the house.

Question--would using Wonderboard, or Soundboard offer any benefit over std wallboard/drywall as the first layer? I've read that greater mass = greater sound absorption. Wonderboard is almost two times heaver than std sheetrock. Also heard that mixing materials can have a cumulative/additive (positive) effect.

Not sure if that would be true on the ceilings--not looking to reduce impact noise, just airborne noise.

Negatives are difficulty installing, and the panels are smaller, so there wd be more joints. Still, we will go over the first layer with good quality gypbd and plenty of GG in between.

Thanks for feedback, Mark

Randy S

  • Guest
Re: What's the Best Sandwich?
« Reply #1 on: April 04, 2011, 04:31:34 PM »
Use the wonderboard + 3 tubes green glue (per 4'x8' sheet) and 5/8" gyp.

Use Cotton fiber insulation! Ultratouch... worth the extra cost.

Instead of tape and mud the wonderboard, use acoustical caulk and butter the back edge. Clean seam of excess caulk while wet.

Make sure you offset the seams between layers.