Drywall thickness for sound dampening

[Earfull]

For noise reduction to upstairs from a downstairs HT room, is there any noticable benefit/advantage in using 5/8" dryall on the ceiling as opposed to 1/2"? (The 10" joists will be insulated with pink fibreglass insulation).

 

[mtrycrafts]

For noise reduction to upstairs from a downstairs HT room, is there any noticable benefit/advantage in using 5/8" dryall on the ceiling as opposed to 1/2"? (The 10" joists will be insulated with pink fibreglass insulation).

Two layers of different thickness, or an acoustic board under drywall, or Z stips, or other damping isolators betweent he sheetrock and joists. Joist will transmit the sound just fine

 

[brendy]

I have been in new construction as a carpenter & HVAC person for 18 years.The 1/8" difference is meaningless.

 

[Dumar]

brendy is right. And the insulation will not help much either.

You really have to get the board off the joists (there are several products for doing this) and then double up on the drywall.

 

[warnerwh]

You need to get some resilient channel which is designed for this and it's cheap. Since the room is for sound you'll want to run the RC asymetrically a little bit to avoid the amount of resonances at the same frequencies. It helps alot. I ran soundboard then resilient channel to controlled density drywall covered by acoustic tile. Sound upstairs is now very little even with my system at a fairly loud level, peaks over 90db. I'm running a Parasound HCA 3500(350wpc) through a pair of Vmps RM 40's(260lbs ea. and 90db) and the females that live here say the little that comes through while they're watching tv doesn't bother them at all. The HT room is directly above the listening room.