Premium Carpet Underlayment

Premium Carpet Underlayment

Our Premium Carpet Underlayment consists of a foam layer supporting an acoustic mass loaded vinyl barrier.  It is durable and effective at reducing the transmission loss of floor assemblies. 

  • Product is 4.5' wide. Quantity = Length. E.g. if you choose "Quantity 12" you will receive a piece 4.5' wide by 12' long. (Note: On larger orders, rolls may be cut to manageable sizes). 

Free Shipping!  See Shipping and Returns Tab below for additional information. 

Price: $20.57
Size and Density
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Made in USA

Premium Carpet Underlayment is durable and effective at reducing both impact noise (higher IIC) and airborne noise (STC).  Product is designed with a mass loaded (MLV) barrier bonded to a high-quality resilient acoustic foam padding.  Barrier layer has excellent damping and stiffness characteristics as well as durability and tear resistance providing optimal sound control at an economic price point.  The foam layer acts to decouple the mass layer from the floor vibrations, creating an effective noise barrier.

For our full lineup of Mass Loaded Vinyls (MLV) without foam attached, click here.

Carpet Underlayment is ideal for treating noise radiating from carpeted floors in residential, commercial and maritime applications.  With the ability to significantly reduce noise at frequencies as low as 250 Hz this product is highly effective at reducing speaking frequencies, home theater noise, mechanical equipment, boat engine noise and other noise sources found in living or working environments.


Installing Premium Carpet Underlayment is quick and easy in new or existing applications without any specialty tools required.  Roll out the underlayment with the barrier side face up and fit the carpet directly on top.  In cases where a tack strip is used, stop the underlayment at the inside edge of the tack strip and tack the carpet in place. 


  • Easy to use and install
  • Low cost solution for both noise transmission and privacy issues.
  • No need for additional carpet pad
  • Firm yet comfortable feel
  • Increases both IIC and STC ratings


  • Reduces road noise in cars.
  • Can be used in all living areas of a boat to increase comfort and reduce engine noise.
  • Mechanical equipment
  • Homes
  • Offices 
  • Meeting Areas
  • Theaters

How To Order:

Under thick and shag carpets, the 1/2" carpet underlayment is suggested for the best noise reduction.  Below firm carpeting such as indoor/outdoor or thin industrial grades, the 1/4" underlayment may be required in order to give the proper feel underfoot.  Product measures 4.5 feet, when figuring out total coverage, multiply the quantity by 4.5 feet.   

This product qualifies for FREE SHIPPING.  See Shipping and Returns Tab above for additional information. 

For more quality soundproofing ideas for floors and ceilings, see our Owens Corning Fiberglass Insulation.

Product Data

For a printable version of Product Data for Carpet Underlayment, please visit.

Enhanced Noise Reduction due to Carpet Underlayment:

Comparison Chart for Carpet Underlayment

Physical Properties:

  1/4" 1/2"
Thickness (nominal) 5/16" 1/2"
Compression set 7% max <10% max
Indentation Load Deflection (25%) 7.2lb/ft2 80 minimum
Indentation Load Deflection (65%) 37lb/ft2 N/A
Impact Isolation Class (IIC) 78 TBD
R factor (ASTM C 518) 1.1 3
Water Resistance (British spill test method E) Pass  N/A
  1lb. /sq. ft.  2 lb. /sq. ft. 
Thickness 1/8" 1/4"
Weight (lb/ft2) 1 1
Specific Gravity ASTM D 798 1.8 2.8
Hardness, Shore A ASTM D 2240  90 Nominal  90 Nominal 
Stiffness, MPA ASTM 749 19.6 19.6
Tensile, PSA ASTM D 412 407 407
Elongation, % ASTM D 624 120 120 
Tear, lbs/1" ASTM D 524 77  
Temp Range (F) -40 - 255F (-40 - 124C) -40 - 255F (-40 - 124C)
STC 26 33
  Fire Rating (composite)

16 CFR Part 1630 - FF1-70/16

Part 1631 FF2-70

2010 Edition

Installation Guide

For a printable version of Installation Instructions for Carpet Underlayment, please visit.

Premium Carpet Underlament is a recycled rubber mat that is meant for installation directly under a hard surface flooring product such as engineered wood, laminate, stone, tile or vinyl.  For floating floors such as engineered wood or laminate, adhesive is not required.

Job Site Requirements:

Before beginning the installation below, all areas to receive underlayment should be weather tight and have a constant temperature of at least 50 degrees Fahrenheit for 48 hours before, during and after installation.  

Subfloor Requirements:

Premium Underlayment can be installed over concrete, self-leveling materials, OSB and plywood.  Subfloor should be smooth and free of defects, cracks or moving joints to prevent transmission to flooring.  Surface to be flat to 4mm (3/16") across any 300mm (12") section.  Grind all high spots and fill indentations with approved self-leveling compound to meet flatness requirements.  

Floating Installation:

1.  Allow Carpet Underlayment to acclimate to the room for one day prior to installation.

2.  Using a chalk line, snap a line perpendicular to the longest wall in the room and establish a straight point of reference for the installation of the underlayment.

3.   Cut the underlayment to the proper length and trim for any penetrations or wall angles.

4.  Place the underlayment along the snap line, cut the adjacent piece, trim it and lay adjacent to the first piece.

5.  Roll with 100 lb. roller to remove any air bubble.

6.  Tape all seams with an Acoustic tape.

Underlayment for Floating Floors

Adhesive or Thin-Set Installation: (not required for floated floor)

1.  Allow carpet underlayment to acclimate to the room for one day prior to installation.

2.  Using a chalk line, snap a line perpendicular to the longest wall in the room and establish a straight point of reference for installation.

3.  Cut the underlayment to the proper length and trim it for any penetrations or wall angles.

4.  Place carpet underlayment along the snap line, cut the adjacent piece, trim it and place it adjacent to the first piece.

5.  Fold each piece in half and apply the mastic to the area under the carpet underlayment using a 0.125" "V" notched trowel.  Apply adhesive perpendicular to the seams.

6.  Place the material so that no bubbles or waves are seen in the area by unfolding the underlayment into the wet mastic.  Assure that no air is trapped below.

7.  Repeat this installation for the second half of the underlayment by folding in the other half sheet; trowel the mastic under and place the second half into the wet adhesive mastic. 

8.  Repeat this process until the room is completely covered.  Assure the space around the room is no greater than a 0.25" space between the wall the underlayment.

9.  Assure that all mastic is installed to a uniform thickness as puddles or differences in thickness can telegraph through the sound mat. 

10.  Wipe any excess mastic from the topside of seams while working.

11.  Roll with 100 lb. roller to remove any air bubbles or adhesive inconsistencies.

12.  Allow install to cure for 24 hours.

Carpet Underlayment Application

Finished Flooring Installation:

For all flooring types:  Follow the manufacturer's installation instructions.  Use their recommended materials.  Do not use mechanical fasteners through the underlayment as this will negate the acoustical performance of the system.


1.  Follow all manufacturer and Tile Council of North America recommendations for installation including adhesives and accessories.

2.  Tile and grout should not be in contact with any wall, penetration and no penetrations should be made through the underlayment to the sub floor, including for expansion joints. 

3.  If cement backer board is required, glue it to the underlayment with the recommended adhesive or mortar.

4.  If crack suppression is required, glue it to the underlayment with the recommended adhesive.


1.  Engineered wood can be floated.  Glue is not required.

2.  For engineered wood that must be glued, follow installation instructions from the manufacturer and from the Hard Wood Flooring Association.

3.   Wood or laminate should not come in contact with any walls or penetrations, and no penetrations should be made through the underlayment to the sub floor.


1.  Follow all manufacturer recommendations for procedures and installation including adhesives.

2.  Apply a thin layer of moisture cure urethane to top of underlayment and allow curing before applying vinyl manufacturer's recommended adhesive. 

3.  Apply adhesive to cured thin layer or urethane.  Can be moisture cure urethane with a 1/32" trowel or adhesive recommended by flooring manufacturer.

4.  Follow flooring manufacturer recommendations for installation over a resilient material.

5.  Test all proposed installations to determine if the vinyl flooring/underlayment assembly is able to resist indentation by heavy appliances, furniture etc.  For installations using underlayment in thickness greater than 2 mm, consult with vinyl manufacturer to determine if vinyl installation is permitted.

Carpet Underlayment for Vinyl Floors

Carpet Underlayment for Tiled Floors

Baseboard Installation:

1.   Trim perimeter isolation strip to top of finished flooring.

2.  Install baseboard to wall but do not allow to contact flooring as this will negate the acoustical performance of underlayment.

3.  Seal perimeter with a non-hardening acoustical caulk.

Shipping & Returns

Shipping and Return information is specific to this product page only (not for other products on our site).

  • Shipping:
    • Product usually ships within 3-5 days.
    • FREE SHIPPING on this product - Applies to orders shipped within the USA (excluding Alaska and Hawaii).
  • Returns:
    • This product is NOT eligible for returns.
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Product reviews are only available to verified buyers of this product. To leave a review, please refer to the product review email we sent you.
  • Great Overall Soundproofing (2)
  • Absorbs Standing Waves (1)
best uses

Reviewed by 3 customers

Displaying reviews 1-3

By Rick J

from Everett Wa

Verified buyer
Pretty darn unhappy
best uses
Comments about Premium Carpet Underlayment:
Material showed up unprotected as the ends were exposed. The pad extends about a 1/2 inch on both ends past the MLV, and will now need to be trimed adding to labor cost to install. Not at all what it looks like on the pictures. Pretty darn upset.

By Kathy

from DC

Verified buyer
Excellent Service
  • Absorbs Standing Waves
  • Great Overall Soundproofing
best uses
Comments about Premium Carpet Underlayment:
We are using this the soundproofing for our mast bedroom floor under our carpet to muffle the sound from the family room below.
Bottom Line Yes, I would recommend this to a friend

By mike

from Philadelphia area

Verified buyer
really blocks sound
  • Great Overall Soundproofing
best uses
Comments about Premium Carpet Underlayment:
We have finished a garage as a bedroom. It is right under wood decking and joists of other bedrooms. Without the underlayment you hear every sound and thump as if in the room with you. With the underlayment, the same noises are heavily muffled - unbelievable difference, and I'm ordering more despite the price. It's also makes walking on the area carpets more comfortable.
Bottom Line Yes, I would recommend this to a friend
Displaying reviews 1-3
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Customers Questions and Answers

1) Antonia: Not sure which density is most appropriate for the carpet underlay. I have noise coming from the apartment below me. Noises include: - talking, kids screaming - stereo (mostly drums & bass but also the rest of the music [singing, other instruments] if the volume is high enough] - kids jumping and roughhousing - TV/video games

Trademark Soundproofing Reply: Hi Antonia. The heavier 2 pound density would be better however not twice as good rather more like 20 percent better. The most popular density we sell is the 1 pound with half inch foam. Thank You

2) Mike: Could this be used under outdoor carpet on an elevated deck that sees rain from time to time?

Trademark Soundproofing Reply: Hi Mike, Rain from time to time is OK as this is a closed cell foam product.

3) nancy: Which is most recommended to try and block downstairs noise from coming up? This or MLV? Wall to wall carpeting will be installed over it. The noise coming up through floor is tv, voices and doors. I currently have wall to wall carpeting with a pad underneath, which does not block any noise.

Trademark Soundproofing Reply: Hi Nancy, The premium carpet underlayment will do a better job as it has the absorptive foam decoupling between the floor and the MLV that is bonded to it.

4) Lorraine P: would like more information on premium carpet underlayment and pricing

Trademark Soundproofing Reply:

Hi Lorraine. Here are some PDF links. Let us know if you need any other info. Pricing is on the product page if you would like help with estimating the price please give us a call or email us. Thank you.

5) Dave: I am looking for sound dampening underlay. The unit above our condo replaced carpet with laminate. However now there is an increase in impact noise. They put down area carpets but no proper underlay. Can you suggest something and if have a solution to ship to Canada?

Trademark Soundproofing Reply: Many of our customers use the premium carpet underlayment for area rugs.

6) Chip P: Regarding the premium carpet underlayment. Is the foam closed cell? I want to use it on a boat but can't have something that soaks up water. Thanks!

Trademark Soundproofing Reply: Yes this is a closed cell and is used on boats many times.

7) Juliana T: we have an old house that is split into an upstairs and a downstairs apartment where we do short term rentals. We have hard wood throughout and we are looking to reduce as much sound as possible without doing anything loony and expensive. we have a lot of recess lighting in the apartment below, we also have exposed beams in one area, where there is definitely a lot of traffic above (its the living room). I am thinking about putting an area rug in that living room and wanted to know if this product would reduce some of the noise. I know this wont be 100% but it might reduce it some? how much would i need for a 8x10 area rug, or a 9x12 area rug (i have to go sure up some measurements) could i have prices for both sizes. Also, would you suggest doing something about insulating the recessed lighting as well? will that really make much of a difference if we have many other issues? thank you, Juliana trigoso

Trademark Soundproofing Reply: Hi Juliana, This product comes in 4 foot wide rolls so just choose the quantity which equals the length. There are different variations once you choose them and the size the price will show in your shopping cart. If possible cover the entire floor for better results.

8) Jason B: I have a 322 sq ft L shaped room with wood floors that is above the living room and is used by my 10 year old son. I am looking to soundproof and carpet over the wood floors. How much of this product would I need. 14 x 8; and 20 x 10. Thanks

Trademark Soundproofing Reply: Hi you need 78 feet by 4 feet wide plus 10 percent for waste. So you would choose quantity 85.

9) Jacqueline W: Is this product available in Canada?

Trademark Soundproofing Reply: We ship to Canada. Please email or give us a call. Thank you.

10) Glen L: Does the 2 lb density provide better sound reduction that the 1 lb density

Trademark Soundproofing Reply: Yes it does. About 4-6 STC points

11) Erwin: hello, I am interested in the product 'premium carpet underlayment, but I do not understand that size and density measures. Can you explain this, what is the thickness of the foam and the vinyl barrier ? Many thanks, Erwin

Trademark Soundproofing Reply: 1 pound density is 1/8" thick for the barrier and the 2 pound density is 1/4" thick for the barrier. You can also choose either a 1/4" or 1/2" thickness for the foam. Use the drop down menu on the page to choose your thickness - the total thickness is shown at the end of each line.

12) Karen Chesney: What is the right thickness under an indoor/outdoor carpet for maximum soundproofing?

Trademark Soundproofing Reply: The thicker the better. The most popular one is the half inch foam with the 1/8 barrier.

13) chad: Is the price per linear foot or by roll?

Trademark Soundproofing Reply: Per linear foot.

14) mike : after installing product do you use a pad on top of?

Trademark Soundproofing Reply: No. The pat of this product is there (underneath). You can add more padding on top however it is not necessary and may make installation more complicated.

15) Tom: Dear, We are currently looking at soundproofing our childrens bedroom. Main reason is noise from the downstairs neighbors soundsystem. Ideally we would lay sound insulating material on top of the current hardwoord floor and finish with a cheaper hardwood or laminate floor. We want to avoid carpet for health reasons. Would the premium carpet underlay be a possibility for this setup? Thank you, Best, Tom

Trademark Soundproofing Reply:

Hi. It would be difficult to install that type of flooring over the carpet underlayment. If you do not mind ruining the current hardwood floor I would suggest a new layer of subfloor with Green Glue in between. However sound may be travelling up the walls as well (Duct work, pipes etc).

16) Andrew R.: I am looking to use the Premium Carpet Underlayment in my Music studio. The room will only require 3-4 rolls, however your website states that I must purchase at least 10 rolls. Is there any way to order less than 10 rolls? Also, do you guys ship to APO addresses? Thank you very much!

Trademark Soundproofing Reply: Hi. You do not need to order 10 rolls. The minimum is 10 Feet (by 4.5' wide). This item is sold by the foot (in length). Please contact our shipping department in regards to ship to addresses. Thank you.

17) David: What is the length of the Premium carpet underlayment 1/4' thick x 4.5'. You give a price of $20.57 but I do not see what the length is for this amount?

Trademark Soundproofing Reply: Length is 4.5 feet (per quantity - every 1 that you add in quantity will add 4.5 feet)

18) Jeff G: I am converting an attic above our bed room to a room for my granddaughter - it will be carpeted - I plan on adding 1/2" ply wood to current subfloor using green glue between layers plus 2lb 1/2" carpet underlayment - I am new to the process and want to know if I am on the right track. Thanks

Trademark Soundproofing Reply: Hi Jeff. That is an excellent plan.

19) john j: I have a 20 by 20 living room in an 100 year old apartment. The linoloeun that is there is probably the same. I just have one cheap throuwn carpet on top of the lineoleum Sound is unbelievable terrible. all wood floors Is it possible to buy this stuff and just lay carpet sections over it without actually installing carpet.

Trademark Soundproofing Reply: Yes that can be done. We have clients who use it underneath throw rugs.

20) lou copeland: $20.57 for how much product? Must order 10 feet? ten rolls?

Trademark Soundproofing Reply: 4.5 feet. You have to order 10 linear feet. Each "1" quantity that you order is 4.5 feet.

21) Maurice K: We are looking at installing this product as an underlay under a very large bound Carpet , so basically a very large throw rug. What thickness of this product would you use?? We are trying to reduce terrible impact noise to the room below! Is the 1lb or 2 lb density better for impact footfall . Which foam thickness would go best without getting too much thickness? thank you

Trademark Soundproofing Reply: Hi Maurice. The thicker the better, so the 2 pound with the 1/2" foam would give you the best results. The most popular thickness our customers buy is the 1 pound barrier with the 1/2" foam.

22) Randy B: Can your foam backed MLV double as a vapor barrier? I cannot access under the old hardwood floor to place a vapor barrier in the crawlspace without pulling up the wood floor. I am aware of potentially trapping moisture under the underlayment and original flooring, which could cause mold, mildew and rot.I am willing to take that chance. The wood underneath is 90 years old, so I'm not worried about it. I need to stop the moisture coming up through the original wood floor and carpeting. I am looking to replace the underlayment and carpeting. So, I need a vapor barrier underlayment. suggestions? Thanks Randy

Trademark Soundproofing Reply:

Our Foil Faced Mass Loaded Barrier will be a vapor barrier.

23) Nazim Q: Hi Our building has a fitness room for 12 years now, suddenly a resident is complaining about noise from the gym. Can we redo the carpet in the gym with this "Premium Carpet Underlayment" underneath the new carpet and have reduction in noise? Please advise. Thanks.

Trademark Soundproofing Reply: Is it the tenant from below that is complaining. If yes than this would definitely be a good product to use if you have carpet there.

24) Nazim: The fitness room is mostly below the terrace of this resident. A small part of it is below her bedroom. We are looking for recommendations to address this. Thank you.

Trademark Soundproofing Reply:

In that case you have to treat the ceiling as discussed here Unless it is the thump of the equipment hitting the ground which in that case you can put down rubber underlayment on the floor.

25) Jason B: Hi, for 550 square feet of carpet, how many 12" x 4.5' would you need?

Trademark Soundproofing Reply: About 135

26) Glen L: Can this product be used on top of concrete and if so does concrete need to be seeled?

Trademark Soundproofing Reply: Yes it can be laid on top of concrete. Unless you have dampness coming up through the concrete you would not have to seal it in regards to the underlayment.

27) Glen L: How do you apply this to concrete just lay it down or glue it down

Trademark Soundproofing Reply: Just lay it down. You may want to glue or fasten the edges to avoid any movement.

28) Sally C: I would like to use this on the floor in a mobile home. I have an existing floor and would add a subfloor, although I don't know what thickness or type of sub-floor to use, and then put this on top before I have carpet installed. Would this work as a sound barrier to outside noises?

Trademark Soundproofing Reply:

You can add a 1/2" plywood with the Green Glue in between for the subfloor. Yes this has a soundbarrier so it would work to block outside sound (that is coming through the floor).

29) George L. G: I would like to get a small sample of your product to evaluate its effectiveness.

Trademark Soundproofing Reply: Please email us at for any sample requests.

30) Tim: Is the minimum order of Premium Carpet Underlayment 4.5 feet x 10 feet?

Trademark Soundproofing Reply: That is correct.

31) Sheldon W: You guys ship to ontario?

Trademark Soundproofing Reply: Yes we do. Please give us a call at 845-388-1200

32) Dr. C: I need 25 sq feet as an underlayment for the 5X5 rug I have over butterflied engine hatch in my boat. How easy is it to trim this material. My guess is to use a 4.5 x 10 run, i'd trim one section to 3 feet wide x 5 feet long to cover the split in the doors and use the second to fill the remaining 2 feet x 5 feet. Can the MLV be easily cut to accomplish this? Thanks.

Trademark Soundproofing Reply: Yes. You can easily trim this using a utility knife.

33) Jennifer W: How effective is this product at keeping the foot traffic noise on a Premuim carpet underlayment second story room from being heard on the room below?

Trademark Soundproofing Reply: Bases on our own installation and customer feedback, it is very effective in damping footfall noise. Every situation varies due to the build, the heaviness of the footfall and other factors.

34) Elliot: What is the backing made of? Does it give off odors? Is there any chance it would discolor laminate flooring over time if placed on top (under an area rug)?

Trademark Soundproofing Reply: It is a closed cell foam. No odors other than standard foam/and vinyl. Without any water spills etc you should not have any discoloring.

35) Melissa M V: Hi. I live in the top apt in my apt building. I have hardwood floors and am hearing noise(footfall, door slamming)from my downstairs neighbor. Would putting down the premium carpet underlay and carpet on top help muffle this type of noise? What type of noise reduction is realistic to expect? In addition would it also help to muffle the footfall noise I am also hearing from my next door neighbor as well? Thanks!

Trademark Soundproofing Reply: Yes it would definitely muffle the footstep sound you are hearing. I can't put a number on it however it would be a significant reduction compared to what you hear now.

36) Kayci : Which would be best thickness/density for under residential plush carpet on 2nd floor of house?

Trademark Soundproofing Reply: 1/2 inch foam and 1 pound barrier.

37) Mark C: Your best carpet underpayment for the family of "elephants" that live above us. Impact noise! Condo in LA. I will pay for THEM to have it installed by ME ($) under their existing carpet or new carpet. Thank you! Dr. Mark C

Trademark Soundproofing Reply: Sorry to hear that :( Best is the 2 pound vinyl with the half inch foam

38) Mike: What is the cost per sq ft? Do you provide samples?

Trademark Soundproofing Reply: Hi Mike. Cost depends on the thickness of the vinyl and foam. Use the drop down menu to see the price change. Please contact our office with any sample requests.

39) cyndi a: What is the STC rating?

Trademark Soundproofing Reply: From 27-32 depending on the thickness.

40) David B: Your website shows a price of $20.57 for the Premuim Carpet underlayment that is for sound proofing. Is that a square foot price or a square yard price?

Trademark Soundproofing Reply: That is the price for a piece 4.5 feet by 1 foot (4.5 sf).

41) HARRY james s: on the floors above our rooms, there is existing new carpeting and padding. This did not do the sound proofing we hoped. Question; Could we remove just the carpeting and put this product directly over the padding and then reinstall carpet. We are hoping to not have to rip out and replace the padding. Is this possible?

Trademark Soundproofing Reply: You should remove the padding too. This will take place of the padding and boost the soundproofing .

42) Edwin P: Can the Premium Carpet Underlayment be used under a rug on top of wood flooring without damaging the floor? I was thinking of the 1/2" foam 3/4" thickness. Thanks.

Trademark Soundproofing Reply: Yes, it can and is used that way.

43) kal t: for a 260 sq foot room, now many would I need to order?

Trademark Soundproofing Reply: 60

44) Nicole: Hello. If the maximum length is 12 feet and I want to place this in a hallway that is 20 feet long, do I need to over lay anywhere that the separate sections of foam meet in order to maximize noise reduction? And do I need to secure the overlaid sections with some kind of tape? Is this product more effective for reducing floor noise than the 2 lbs MLV?

Trademark Soundproofing Reply: Just butt the edges close together and use a PVC tape over top. Overlay would be better however that is not usually feasible as it would create a non smooth bump.

45) Carrie T: In regards to the Premium Carpet Underlayment, can you also put a carpet pad on top of the underlayment to also increase the noise reduction? Thank you

Trademark Soundproofing Reply: You can. The pad under the barrier is already as a carpet pad and many people like the feel. You can play around with it and see which way feels best for you.

46) Steven b: I am converting my attic into a play room and golf simulator where there will be intermittent loud noises from the clubs striking the ball. These sounds will generally be greatest between 500 and 10000hz. I’m planning on using the half inch 2 pound density premium carpet underpayment. In question 18 above “Jeff” described putting down green glue and a second layer of 1/2”osb subfloor. How much additional soundproofing would that provide? Would it be necessary for this application/provide noticeable benefit? 18) Jeff G: I am converting an attic above our bed room to a room for my granddaughter - it will be carpeted - I plan on adding 1/2" ply wood to current subfloor using green glue between layers plus 2lb 1/2" carpet underlayment - I am new to the process and want to know if I am on the right track?

Trademark Soundproofing Reply: Hi Steven.It would give you approx an additional 5 STC points. You may get enough from just the premium carpet underlayment. However if you are looking to maximize the soundproofing than this will definitely add to it.

47) sam: how does this impact the softness of the carpet?

Trademark Soundproofing Reply: You still have the softness of the carpet and the pad there is just a little more firmness to it. We actually have many clients that like the way it feels for walking on more than regular carpet pads.

48) Rick: Are these underlayments better/worse/same as conventional carpet pad with regard to permanent indentation from overlying furniture

Trademark Soundproofing Reply: Hi Rick. We do not have any feedback from customers on that. There is a solid barrier on top of the pad not sure in which way it would effect indentations.

49) Michael V: I own an two family home and want to sound proof the floor in the unit on the second floor. There are hardwood floors that I want to leave untouched. I would like to use your premium carpet underlayment underneath wall to wall carpeting. The carpeting I plan on using is twist style type with a face weight of 60 that is approximately 1 inch think. The total measured square footage of the second floor unit is 572 and will need 15.67 square yards of carpet. I have three questions: Question 1 - How much of your carpet underlayment would I need to order? Question 2 - For the best soundproofing, which thickness carpet underlayment should I order? Question 3 - To protect the hard wood floors will I need to install a vapor barrier underneath the carpet underlayment?

Trademark Soundproofing Reply: Usually the square footage plus ten percent more for waste. Half inch foam. There should be no damage other than maybe some staining of the color so if your worried you may want to use a paper. I would stay away from a vapor barrier in case some liquid spills and gets trapped there.