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high hertz soundproofing
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January 30, 2023 - 8:15 pm
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hello i am college student who lives at home with dogs,my walls are very thick and soundproof but my door is not considering a dog bark is around 1000-2000 hertz what material would you recommend i cover my door in for further soundproofing. thank you.

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January 31, 2023 - 5:28 am
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You must raise the density of the door to match the density of the walls it is attached to. Make sure your use a good seal around the door edges.

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February 4, 2023 - 2:35 pm
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Most domestic doors area hollow core design – an inner and outer skin of 1/8″ Masonite or plywood. a solid wood perimeter. and filled with a 3″ or so cardboard honeycomb for stability and stiffness. Laminating additional material on the back like 1/2 – 3/4″ MDF with an acoustical adhesive constraining layer like Acousti-Gasket tape will help – if you also weatherstrip the door to seal it and add a sealing sweep to the bottom of the door. I wouldn’t use sheetrock it’s too fragile for a moving piece like a door, the edges will get too beat up unless you put bead on them and in general the few dollars you’d save will get consumed mitigating other issues.

Acousti-Gasket tape typically comes in 24 ft X1.5″ rolls, enough to line the perimeter of a standard 30″ door and leave 3 – 24″ pieces left over for inside the perimeter. This works better if you pull the hinge pins and take the door down, but will require 2 people to rehang the door. Also note the gap you’ll need to fill with weatherstripping. You can use most any type, but for installation ease, I’d look for a self-adhesive silicone rubber, 1/2 X 1/4″

For the door bottom, measure the gap to the floor with the door close, and whether there is carpet or tile on the in-sweep you’ll have to clear. If there are not clearance issues on the in-sweep, you can fit a door bottom with a sweep seal. These are readily available at HD, Lowes, etc for under $20. If the room is carpeted, the you may have to install a threshold – usually an aluminum strip holding a vinyl half-round gasket. These cost $20-30. The important thing here is that it seals the air gap.

You will also likely have to cut out a piece to clear the doorknob. This won’t materially impact the performance of the panel. A sabre saw would be handy here. If you have access to a router I would round the edges to prevent chipping. If not, at least roll the edges over with a wood rasp and sandpaper.

Next, peel and stick the tape to the door, about 1/8-1/4″ in on all sides. Place the 3 remaining 2 ft pieces asymmetrically to minimize panel resonances, then carefully fit the panel in place, making sure it it’s square – you wont get a second chance without ripping the tape. Press the panel firmly to seat the tape and wait 30 minutes for the bond to cure. Adding a few wood screws – a couple top and bottom and on each side around the perimeter to support the weight would be a Really Good Idea. The reason for recessing the tape is so you can come back and caulk the perimeter to give it a finished look. Now would be a a good time to fit the weather stripping.

With your partner, re-hang the door, making sure it clears the door frame. I Next, caulk the perimeter with a paintable acoustical caulk and finish the panel as you wish.

This solution will maintain the external esthetics your parents will appreciate, and significantly reduce the diaphragmatic transmission throught the door. The weatherstripping will also stop noise from flanking around your newly mass-loaded door. While more mass is better, look at the hinges – are there two or three? A two hinge interior door with an other 50Lbs of MDF hanging from it might not be the best idea, and you may want to limit yourself to 1/2″ MDF. A 3-hinge door shouldn’t be an issue. And as with all projects involving your parents house – measure twice, cut once.

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February 5, 2023 - 5:25 am
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Construction and materials are frequency and amplitude based. What is the frequency and amplitude of your noise? The major design factor that must be met with doors is that their density at least equal the density of the wall they are attached to. If you have a strong door and a weak wall, noise is like water, it will find the weakest link and go through the wall.

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