Author Topic: Sound became louder after building partition  (Read 4097 times)

Chris

  • Guest
Sound became louder after building partition
« on: February 16, 2001, 05:27:30 PM »
Hi
We got some contractors to build partition some music rooms.  They used 2" thick high dense rock wool with 12 mm gypsum boards.  After adding another layer of 15 mm plywood with 15-20 mm airspace, the sound became louder.  What could be done to soundproof the rooms so that they couldn't hear each other in the next rooms.
Also, the doors were hollow and filled with low density rock wool.  Doesn't seem to work.

Randy - Super Soundproofing CO

  • Guest
Re: Sound became louder after building partition
« Reply #1 on: February 18, 2001, 06:01:32 AM »
: Hi
: We got some contractors to build partition some music rooms.  They used 2" thick high dense rock wool with 12 mm gypsum boards.  After adding another layer of 15 mm plywood with 15-20 mm airspace, the sound became louder.  What could be done to soundproof the rooms so that they couldn't hear each other in the next rooms.
: Also, the doors were hollow and filled with low density rock wool.  Doesn't seem to work.
Yes, the addition of the plywood caused a sounding board effect.  You'll have to take it out.  The doors need to be changed to solid core, exterior type doors as a minimum.  

Chris

  • Guest
Re: Sound became louder after building partition
« Reply #2 on: February 18, 2001, 05:28:29 PM »
Hi Randy
Thanks for the advice.  But the doors were mounted on aluminium jambs.  Would these be able to take the weight of solid wooden doors?  I know of a studio that did something like 3 solid doors thick ie around 5", with the center one wrapped up in carpet, yet sound went through (muffled though),  They also have layered jambs.
What if lead sheets were pasted over them + some sound absorbers instead?  Will it work?
We feel that the existing 4" partition even without the plywood is insufficient.  Can anything be done to further improve the situation.  We are thinking of putting in some lead and absorber + airspace.
How about glass - tempered, laminated or double-glazed in addition?  We want a barrier.

: : Hi
: : We got some contractors to build partition some music rooms.  They used 2" thick high dense rock wool with 12 mm gypsum boards.  After adding another layer of 15 mm plywood with 15-20 mm airspace, the sound became louder.  What could be done to soundproof the rooms so that they couldn't hear each other in the next rooms.
: : Also, the doors were hollow and filled with low density rock wool.  Doesn't seem to work.
: Yes, the addition of the plywood caused a sounding board effect.  You'll have to take it out.  The doors need to be changed to solid core, exterior type doors as a minimum.  


Randy - Super Soundproofing CO

  • Guest
Re: Sound became louder after building partition
« Reply #3 on: February 24, 2001, 10:43:43 PM »
: Hi Randy
: Thanks for the advice.  But the doors were mounted on aluminium jambs.  Would these be able to take the weight of solid wooden doors?  I know of a studio that did something like 3 solid doors thick ie around 5", with the center one wrapped up in carpet, yet sound went through (muffled though),  They also have layered jambs.
Sure the jamb will hold them if they are mounted properly.  See the door link below for more info on doors. /
: What if lead sheets were pasted over them + some sound absorbers instead?  Will it work?
Use solid core doors, well fitted to the frames.  See the door thing
: We feel that the existing 4" partition even without the plywood is insufficient.  Can anything be done to further improve the situation.  We are thinking of putting in some lead and absorber + airspace.
Go to the link on the wesite about soundproofing walls: http://www.soundproofing.org/infopages/channel.htm

: How about glass - tempered, laminated or double-glazed in addition?  We want a barrier.

: : : Hi
: : : We got some contractors to build partition some music rooms.  They used 2" thick high dense rock wool with 12 mm gypsum boards.  After adding another layer of 15 mm plywood with 15-20 mm airspace, the sound became louder.  What could be done to soundproof the rooms so that they couldn't hear each other in the next rooms.
: : : Also, the doors were hollow and filled with low density rock wool.  Doesn't seem to work.
: : Yes, the addition of the plywood caused a sounding board effect.  You'll have to take it out.  The doors need to be changed to solid core, exterior type doors as a minimum.