Super Soundproofing Community Forum

Soundproofing Forum Topics => Soundproofing Windows and Doors => Topic started by: Loud Music Maker on April 07, 2019, 02:05:48 PM

Title: Help soundproofing a metal utility door
Post by: Loud Music Maker on April 07, 2019, 02:05:48 PM
Hi, I soundproofed a wall with rock wool, MLV, 2 sheets af 5/8 drywall with green glue between, roofing tape around the electrical boxes, sealed everywhere with acoustic sealant, it works pretty good but the metal utility door hung on one end of the wall is transmitting sound, the door is sealed very well it’s the actual metal part of the door that is the problem, I need to muffle the metal, I have a left over piece of MLV that would cover the door perfectly, I’m looking for advice how to attach the MLV to the door and any other tips.
Thanks,
Rob
Title: Re: Help soundproofing a metal utility door
Post by: Randy S on April 08, 2019, 04:57:19 PM
you can use contact cement or construction adhesive complete coverage (do not spot glue)
then add a screw and washer in each corner.

Randy S.
Title: Re: Help soundproofing a metal utility door
Post by: Loud Music Maker on April 08, 2019, 11:40:14 PM
Thanks Randy, Should I add more layers ? Drywall ? Or perhaps a second door ? The metal door is filled with foam, do you know these types of doors ? Are they any good for soundproofing or should I replace it ? My objective is to have the door block as much sound as the wall ...
Title: Re: Help soundproofing a metal utility door
Post by: Randy S on April 09, 2019, 03:03:04 PM
Im not a fan of metal doors because of the foam or fiber fill..

but in order to make the door achieve good reduction you need to make it as heavy as the walls or heavier (lbs per sqft.) real top notch soundproof door come in around 500 lbs. (25lbs sqft)
I have added everything from MLV to lead sheet, even cement board..

Randy S.

Title: Re: Help soundproofing a metal utility door
Post by: Randy S on April 09, 2019, 03:09:49 PM
adding a second does make a huge improvement as well.

Randy S.
760-752-3030
Title: Re: Help soundproofing a metal utility door
Post by: Loud Music Maker on April 09, 2019, 06:09:10 PM
Thnks, I made a mistake by buying the metal doors, they are already hung, the good thing about the metal doors are they come with a well sealed jamb and threshold.

I have 2 options, which would you recommend:

1 - build up the metal door to match the wall with MLV and 2 sheets of 5/8 drywall with green glue ?

2 - replace the metal door with a solid wood door ? (If I can find one the exact size)

Title: Re: Help soundproofing a metal utility door
Post by: Randy S on April 09, 2019, 06:18:25 PM
no matter which path you take, you will have to get the weight increased. 2 1/2" solid oak doors are around 175 lbs. and expensive and still might not be enough.
the first thing I would do is calculate my wall mass (lbs per sqft.) then see if it feasible to add the additional weight.
if you can, then add the weight to your existing door.
if not look into a second door with enough weight to exceed the wall weight.

Randy S.
 
Title: Re: Help soundproofing a metal utility door
Post by: Loud Music Maker on April 10, 2019, 01:35:59 PM
Thanks again Randy, I will try to add the same material to the door that I did to the wall and see ... I hope the hinges can handle it, also what about the deadbolt ? I imagine this can be a problem, how do you deal with that ? Build a little cut out to access the deadbolt ? Or remove the deadbolt and fill in the bore and use a different system for locking ?
Title: Re: Help soundproofing a metal utility door
Post by: Randy S on April 10, 2019, 03:14:04 PM
normally I simply use a roller latch system with no hole in the door.
if the room needs to be secured I opt for double door system with deadbolt on outer door.

other then that you can try foam or MLV to make a cover.

Randy S.
760-752-3030
Title: Re: Help soundproofing a metal utility door
Post by: Loud Music Maker on April 17, 2019, 10:49:15 PM
Hello again, So I have another idea: I found a very heavy fire door at my local salvage place and am thinking of buying it ($100) and using it as a second door, I don’t have room for the whole door to swing open so I’m thinking of cutting it in half and make 2 latching half doors with a lot of weather stripping and sealent, maybe even add MLV and perhaps rock wool in the gap if necessary, problem is the door is so heavy I can’t manage it myself, not sure even 2 people could handle it, do you have any advise for dealing with the weight of these doors ?