How to soundproof a utility closet

This blog describes How to soundproof a utility Room and provides a basic explanation of the cheapest and most effective techniques to soundproof your utility closet. Those are generally ubiquitous, and you can use them in any room of your house.

How to soundproof a utility closet?

Soundproofing can be accomplished on a cheap with readily available supplies from hardware stores or the internet. Here are some ideas on how to soundproof a utility closet. 

  • Adding mass or drywall to the existing space
  • Decoupling the walls
  • Sealing the gaps and soundproofing the door
  • Make Your Floors Soundproof
  • Hang soundproofing curtains
  • Install Absorbent Sheets
  • Fill Gaps and cracks in the utility closet
  • Vibration Mounts in the HVAC System

Utility closets don’t make a lot of noise. However, sometimes you’ll find the continual vibration and low voice irritating. Whether it’s the noise from the washer spinning and the dryer turning disturbing the tranquilly in your home or it’s the HVAG system installed in your utility closet. 

Here’s what you can do if you’ve had similar issues in the past. Typically, the beginning noise is grating. It’s time to muffle your utility closet if this noise disturbs you.

When you’re relaxing in the luxury of your own home, the last thing you want to hear is the buzzing and rumbling noises of the HVAC system in the utility closet. When these systems are in use, they can create a lot of noise, and utility closets are frequently located in inconvenient places like living rooms or restrooms.

A soundproof HVAC closet can assist reduce Ac Unit Noise, particularly if your main room or family room is near to the HVAC closet’s front entrance.

Soundproofing a utility closet is a good long-term investment that will save you from having to deal with annoying noises while also maintaining a consistent circulation of air in your room.

What Is The Best Way To Soundproof A Room?

When it comes to soundproofing, there are four main criteria to follow. These are the following:

  • Mass
  • Decoupling
  • Absorption
  • Damping

Vibration allows sound waves to pass through solid surfaces (walls) and, of course, via air. As a result, soundproofing entails limiting the number of sound waves that can exit or enter a room.

Adding mass or drywall to the existing space

If you already have the space, the greatest way to start is to start adding mass to the existing structure. Adding more layers of drywall to the utility closet is indeed the simplest way to accomplish this.

Drywall is remarkably powerful at dampening for its composition, which allows it to absorb and dampen sound waves.

When it comes to soundproofing a utility closet, you have two options one is to drywalling the existing walls within the closet or constructing a drywall enclosure around the Ventilation system. If you want to choose the latter solution, make sure you follow the company’s ventilation instructions for the unit and make sure it’ll still be accessible when it’s time to be repaired.


  • Place a stepladder in the duct’s vicinity. With a pencil, mark a sheet of drywall conferring to where it will be installed on the wall or ceiling; this will decide which end or edge to measure from.
  • Measure from the top of the wall’s corner to the duct’s closest edge. Measure from the same place to the duct’s outer end. Make a note of these points on the sheet’s face.
  • On one end of the duct, locate a control-point stud or ceiling joist. 
  • Mark these places starting at the proper end or edge of the drywall panel.
  • With the pencil and a 24-inch level or drywall square, trace the perimeter of the rectangular cutout on the sheet. With a knife blade, score the lines.
  • Remove the rectangular part and cut the lines using a drywall cutter.
  • Install a drywall screw-tip attachment on the power drill.
  • The control edge of the sheet should be centred on the matching control stud or joist when it is placed against the wall or ceiling.
  • Align the edges of the rectangular hole with the duct’s outer margins and connect the drywall to the studs or joists at 6-inch spacing with 1 1/2-inch drywall fasteners.

Probably fill the area between the existing walls and the drywall with insulating foam if you wish to bring drywall to the existing walls.

Foam isn’t a decent soundproofing material on its own, but since the goal of this exercise is to add mass to the area, it becomes rather useful in this situation. Ensure your setup is comprehensive so you don’t waste all of your time and effort.

Materials NeededTools Needed
insulating foamknife blade pencil

Decoupling the walls

Decoupling the wall is a simple and inexpensive way to soundproof it. You can soundproof existing walls by sandwiching an insulating layer between the surfaces.

To decouple the wall, first, break it in half, then cover the gap with insulation. The insulation layer, in addition to contributing to the mass on the drywall and lowering noise, also adds to the mass on the drywall and adds to the noise passing through.

Use a stud wall to install the drywall for better noise reduction. The quantity of vibration sound that passes through the walls can be reduced by hanging the pieces of drywall with varied stud walls.

When decoupling the drywall, use Green Glue. Green Glue converts vibrations into waste heat, enabling soundproofing the walls simple.

How to put up double layers of drywall?

  • Start in the corner of one wall with the first drywall section. For the walls, use a hammer and 1-5/8-inch nails spaced 8 inches apart.
  • To slice around receptacle outlets, use a portable rotary tool with a drywall cutting blade.
  • The other wall sections should be measured, cut, and installed to their proper sizes.
  • Put a second coat of drywall on the walls, fitting the sheets at a 90-degree angle to the first.
  • To compensate for the greater thickness of the second drywall layer, wall nails should be longer.
  • Employing screws or nails at least as long as this dimension, add at least 1 inch to the thickness of the two sheets when putting them together.
Materials NeededTools Needed
Green GlueDispensing gun hammer 1-5/8-inch nails

Sealing the gaps and soundproofing the door

The HVAC closet entrance can be soundproofed to help reduce the amount of noise that escapes the closet. Because the door is the primary source of sound leakage, you should focus your efforts on dampening it.

Fixing the holes and cracks on the door is the first step in adequately soundproofing it. These areas are the most notorious for allowing sound to enter or exit.

A rubber door sweep is the greatest type of door seal. This is an excellent insulator that will significantly decrease the quantity of leakage beneath the door. If you do decide to install one, stay away from brush-style door sweeps since they will perform little to no soundproofing.

How to install?

Using a tape measurer, determine the width of your door. If your door is less than 36 inches wide, use scissors to cut the door sweep to fit.

  • Then, with the clear vinyl seal contacting the bottom of the door, place the door sweep against the closed door. Make a mark on the door surface where you want the sweep to go.
  • Then, using the markings as a guide, remove the liner and force the door sweep into place.
  • Finally, double-check for gaps between the adhesive door sweep and the door threshold.

It’s also a good idea to get acoustic sealant tape to plug in the remaining gaps surrounding the door. This device is low-cost and simple to order online, and it merely fills the gaps with a substance that traps sound waves that attempt to escape around the door.

Materials NeededTools needed
door sweepScissors
clear vinyl seal
acoustic sealant tape

Make Your Floors Soundproof

Soundproof the ground if your utility room is over another room. To reduce the sound from HVAG systems or washers, dryers, place large rugs or soundproofing materials on the floor.

Soundproofing your floors reduces disturbance with rooms underneath the utility closet.

Hang soundproofing curtains

If the utility room has a louvred door, Soundproof curtains or drapes can be the finest option for soundproofing it.

It’s difficult to soundproof a louvred door because the holes are supposed to allow for ventilation, similar to air vents, but it’s not impossible.

One of the quickest and easiest ways to reduce noise through a louvred door is to use soundproof drapes.

Materials NeededTools Needed
Soundproof curtainsA piece of cloth

Install Absorbent Sheets

Another low-cost alternative is to soundproof a closet with absorption sheets. They aid in the suppression of echoes as well as the absorption of mid-high frequency vibrations.

Absorption sheets are easy to put up and usually stick to the walls of the utility closet. This is a straightforward procedure that does not require the use of any instruments. Rubber foam is used in absorption sheets, which are resistant to water, oil, and fuel. The foams, unlike blankets, do not absorb wet or emit scents. They are self-adhesive and simple to apply to the wall.

Materials NeededTools Needed
Rubber foamRubber cutter

Fill Gaps and cracks in the utility closet

Because noise can escape via holes of any size, whether you’re concerned about soundproofing, ensure you plug all gaps you can. Gaps among drywall pieces, fissures in the wall, and holes in which bolts are fitted are all examples of this.

Locate and fill all of the gaps in the room with acoustic sealant. Acoustic sealant, unlike conventional sealant, is springy and thus less susceptible to cracking. It’s also better at dampening sound than regular sealant.

Seal any gaps around the HVAC mounts, which are a frequent cause of vibrations flowing into the walls.

Materials NeededTools Needed
Acoustic sealant,acoustic caulk

Vibration Mounts in the HVAC System

It may be worthwhile to use vibration mounts, based on how your HVAC system is positioned in the utility closet and supposing this is the item that requires soundproofing.

Vibration mounts are rubber feet or mounts that the HVAC unit is placed on. These will aid in reducing vibrations that may be transmitted from the unit to the walls.

Fixing these may be one of the more difficult tasks on this list, since it may necessitate removing the HVAC unit and replacing it with new mounts.

If this is something you are capable of, it will create a change, but only do it if you are confident in your technical competence.

Materials Needed
vibration mounts


This blog has provided you with tips on how to soundproof a utility closet. The most key point to remember is that adding mass to any space is the most efficient method to soundproof it, but you must ensure that any work done in the utility closet does not interfere with its operation. 

This is particularly true when it comes to HVAC units since you don’t want to reduce ventilation and risk a fire. Another thing to keep in mind is to keep vibrations from the HVAC unit to a minimum. This is simply accomplished by placing the machine on foam cushions or vibration mounts. The simpler it will be to soundproof the room if you can lessen vibrations at the source.

Whatever approach you choose, please remember the more effective you want this to be, more the money it will cost.

Frequently Asked Questions (FAQs): How to soundproof a utility closet?

What is a sound blanket for an air conditioner?

Acoustic barriers and sound blankets are used to mitigate noise pollution by absorbing sound from an offending piece of machinery or workplace. They can accomplish sound reduction of up to 35dB in the field thanks to extremely sound-absorbent yet impenetrable materials.

Is it true that acoustic foams are flammable?

It does not affect sound transmission. This form of foam is not only ineffective at reducing sound, but it is also flammable and produces thick, poisonous smoke when ignited.

Is acoustic foam prone to deterioration?

The foam in acoustic foam panels will begin to flake away and spew dust particles into the air about 7 years after they are manufactured. This isn’t simply problematic for your air vents; also it implies the material isn’t catching and transforming echoes. Over time, the acoustic foam will deteriorate.

When my air conditioner kicks on, why is it so loud?

If the sound only occurs when your unit is turned on, the compressor motor is most likely to blame. The damper lowering after the AC turns off is most likely the source of the slamming sounds. If you have sheet metal ducts, you may also hear loud cracking noises as the vents expand and compress due to pressure and temperature fluctuations.

Is it possible to wash acoustic foam?

Cleaning your acoustic foam regularly, one to two times a year, based on the quantity of dust that develops in your room, is recommended. Cleaning routines: Wipe clean the panels with a damp towel but do not allow them to become wet. If the panels are soaked in water, the foam will disintegrate significantly faster.

What is the best way to clean soundproof walls?

Soil Conditions on a Day-to-Day Basis Dirt and smudges can be cleaned with a mild detergent, hot water, and, if needed, a strong bristle brush to remove any dirt from deeply textured patterns’ crevices. Starting from the bottom of the wall, clean your way up. Using a sponge, thoroughly wash from the top to bottom with clean water.