Author Topic: MLV install around heating vents  (Read 2968 times)

captainivi

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MLV install around heating vents
« on: January 30, 2009, 12:44:19 AM »
I recently moved into a townhouse and my bedroom is over the living room.  Conversation and TV/stereo noise can be heard through the floor.  I want to soundproof the floor using MLV under new carpet and pad. 

First Question: the old carpet padding is rebond type and ive been told you can lay MLV on top of this as opposed to buying MLV with closed cell foam bonded to it.  On my limited budget i can buy 1 layer of MLV with closed cell foam or 2 layers of MLV layed over the rebond carpet padding.  Assuming i properly install the MLV Which method will be most effective in blocking TV and conversation noise from coming up though the floor.

Secondly:  Along the exterior bedroom wall there are two central air vents in the floor.  They are fed by sheet metal ducts which are run between the plywood bedroom floor and drywall living room ceiling the length of the room.  The ducts are seperated from the living room by only a layer of drywall.  Will these vents negate the sound blocking properties of the MLV.  what are my options for dealing with noise coming up through the vents?

Thanks

Randy S

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Re: MLV install around heating vents
« Reply #1 on: January 30, 2009, 08:13:30 PM »
First Question: the old carpet padding is rebond type and ive been told you can lay MLV on top of this as opposed to buying MLV with closed cell foam bonded to it.  On my limited budget i can buy 1 layer of MLV with closed cell foam or 2 layers of MLV layed over the rebond carpet padding.  Assuming i properly install the MLV Which method will be most effective in blocking TV and conversation noise from coming up though the floor. Yes both systems you mention work well for airborne sound,mainly you need a decoupler between the MLV and floor and then padding between carpet and MLV.

Secondly:  Along the exterior bedroom wall there are two central air vents in the floor.  They are fed by sheet metal ducts which are run between the plywood bedroom floor and drywall living room ceiling the length of the room.  The ducts are seperated from the living room by only a layer of drywall.  Will these vents negate the sound blocking properties of the MLV.  what are my options for dealing with noise coming up through the vents?You really need to line the ducts with SSP foam mat to get a reduction in sound passing through the vents or make removable covers...yes these vents will be the main sound leak

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Randy Sieg

Super Soundproofing Co
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888-942-7723
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