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Carpet Specifications Explained



Carpet specification really matter when choosing the right carpet for your home - Carpetprofessor.comUnderstanding Carpet Specifications is the ONLY sure-fire way for you to know if the carpet you select is able to tolerate your level of foot traffic. Knowing just a little bit about carpet specifications can help you determine how long your new carpet will last and retain its like-new appearance.


Many homeowners choose a grade of carpet not designed to meet their needs and goals. They make their choice based on cost, softness and appearance rather than quality. It's hard to tell if one carpet is more durable than another just by looking at it or feeling how soft it is. All carpets look and feel great when new. The only sure-fire way to tell the difference in quality between two different carpets is to compare carpet specifications side by side.

How to Find Carpet Specifications?

Sometimes locating all the carpet specifications you need to help you make wise and informed carpet-buying choices can be difficult, if not nearly impossible, depending on where you shop for carpet. 


Some carpet manufacturers are reluctant to freely provide carpet specifications to their dealers and their customers. Some carpet retailers are also reluctant to provide carpet specifications to their customers. 



3 Ways Dealers Get Carpet Specifications

1. Dealers can call the Carpet Manufacturer directly – most carpet mills are happy to fax or email the carpet " spec sheet". You can also call the carpet manufacturer yourself as long as you have all the key information about the carpet in question. The manufacturer; the style name; the color name; or color number. 


2. Dealers can login to their online carpet mill account  - to gain access to carpet specifications. This may require a store manager to login to obtain the information you want. It is easy for them to do, if they are willing to take the time to do it.

3. Dealers can call their Carpet Mill Representative to obtain the information you need. Every carpet retailer has the cell phone number to reach their carpet account representative. It may take a day or two for their mill rep to provide the carpet specs you want, but they can provide it if they are willing to take the time. If they don't, then I suggest you buy from another dealer who will!



When To Ask For Carpet Specs?

It’s true that the carpet manufacturers are not putting the detailed construction information on their carpet samples like they used to in the past, but any decent carpet salesperson should be willing to get you the information you seek. However, you have to ask for it and be patient enough to wait for the information to be acquired, and it may take a day or two for the salesperson to get it. 


Most homeowners take several carpet samples home for a few days and narrow their carpet selections down to three or four good choices and then ask for the spec sheets for them all to compare them all side by side. 


Take your time making your final selection and don’t be afraid to take a week or two to think about it. Never let any salesperson pressure you into buying right now for any reason. It’s common for salespeople to urge you into buying right now by saying the sale will be ending soon or that the current prices are about to increase.




The Salesperson Can't Get Specifications?  

There's only one carpet manufacturer that I have ever known to refuse to provide carpet specifications to their dealers and to consumers, and that mill is Karastan. However, lately they have been providing specs to consumers. I have a list of phone numbers you can call to ask for carpet specs here.


All other carpet makers are willing to provide carpet specifications to their dealers; and often to homeowners directly either by phone, by fax, snail mail, email or on the internet. 


You may need to be patient and give the salesperson sufficient time to call and get the information for you. (It may take a few days) However, if your carpet salesperson refuses to provide all the carpet specifications you need, then you might want to give your business to a retailer who will. 



Call the Carpet Manufacturer Yourself

You can call and ask for the carpet specifications as long as you have the manufacturer's brand name and the carpet style name. Here is my List of Carpet Mill Websites and their phone numbers. 






The Carpet "Specification" Label

On the back of almost every retail Carpet Sample there should be a manufacturer's label that shows... 

  • Type of Fiber

  • Pile Density

  • Face-Weight

  • Pile Height

  • Tuft Twist

This is must-have information that every homeowner needs to help determine how durable the carpet is, to help determine its value; and determine whether or not it would be a suitable choice to meet your needs, goals and lifestyle. 



The Carpet Warranty Label

Other information shown on the warranty label:

  • Anti-stain treatments that may have been applied (Scotchgard?)

  • Manufacturer's brand name (Shaw, Mohawk, Dream Weaver)

  • Carpet style name (e.g., Enchanted Evening II)

  • Color name or color number (Emerald Green or EG-124)

  • Warranty Wear Limits (# of Years)

Learn more about Carpet Warranties



1. What is Carpet Pile Height?

If you want your carpet to resist matting and crushing of the pile, I recommend a Carpet Pile Height of 3/4" or less. On stairs, I recommend a Carpet Pile Height of 1/2" or less and a Carpet Padding Thickness of 7/16" or less and a Pile Density Rating of at least 8-pounds. The Pile Height measurement is not always shown on the carpet sample, however all you need is a tape measure. Don't include the carpet backing, just measure the soft fibers from the backing up.


Keep The Pile Low

A Shorter Pile-Height makes for a much more durable carpet. It also makes the carpet much easier to clean, more stain resistant and less prone to matting and crushing of the pile. 


Commercial Grade Carpet usually has a very short pile-height and a dense pile. It can tolerate heavy foot traffic for decades, resists stains and is easily steam-cleaned. Most commercial carpet is glued down to the floor without any padding. This is the secret for success they use in offices, airports, casinos and banks to name a few.



2. What is Carpet Pile Density?

Pile Density is a mathematical calculation based on the fiber Face-Weight and Pile Height. Think of a heavily wooded forest. The more closely packed together the trees are, the more dense the forest is. The same goes for carpet. 


You want a carpet with the tufts packed tightly together. This helps the carpet resist matting and crushing of the pile and increases durability and longevity. Pile Density is a major factor to consider when it comes to carpet durability too, almost as important as the type of Carpet Fiber you select. 



3. What is Carpet Face-Weight?

Face-weight is the actual weight of the fiber used to manufacture the carpet pile, but does not include the weight of the carpet backing. Fiber Face-weight is not the same as Total Carpet Weight, which includes the weight of the carpet backing and the fiber face-weight. 


Most carpets have a face-weight somewhere between 20 ounces and 100 ounces, but the typical face-weight for residential carpet is 30 to 60 ounces. A higher face-weight does not automatically mean the carpet is a better grade; is a higher quality; is more durable; or is more costly.

These three carpet specs are mathematically related which is good news for you. If you can figure out one or two, out of the three specs, then you can easily figure out the other specifications using the formulas I reveal below! 



4. What is Tuft Twist?

Carpet fiber is either extruded or twisted to form a single strand or "filament". These filaments are similar in size to a human hair. A bunch of filaments are grouped together and twisted together to form Tufts. While the fiber strands are twisted, heat is applied to "set" them permanently, hence the term "heat set" or "perm". The tighter the tufts are twisted together the longer the carpet is able to maintain its "like-new" appearance. The Tufts illustrated below are one-inch long. I have used two colors to help show the number of twists. 




The Tuft Twist Rating

Based on the number of twists per lineal inch of tuft.



7 tuft twist example


This Tuft has 7 twists and is a sign of a more durable carpet. Frieze styles have tufts similar to this and cost about $35 per square yard and up, or $3.88 per square foot. More expensive carpet styles tend to have higher Tuft-Twist ratings.





4 tuft twist example


This Tuft has 4 twists and is not as durable or long lasting. Low to medium grade Plush and Textured Plush styles often have a tuft twist rating similar to this and range from $15 per square yard or $1.66 per square foot and up.





tuft bloom example


Carpets rarely wear out from fiber loss, they just start to mat down; gradually lose the luster and shine; and just start to look bad or ugly. Once the tufts have blossomed and become matted down, the damage cannot be undone, reversed or repaired. Learn more Carpet Manufacturing Specifications Explained



Points To Remember:

  • The Tuft Twist Rating is based on the number of twists per lineal inch of the tuft. If a tuft is only a half inch long, you would need to double the twist count to determine the twist rating.

  • The Tuft Twist count usually range from 3.0 to 7.5. Lesser quality carpets will have a lower number of Tuft Twists. The higher the Tuft Twist the longer your new carpet will retain its like-new appearance.

  • Carpet "Blossom" or blooming is a common carpet condition where the Tuft begins to un-twist and starts to look worn out, matted down and ugly! 

  • Some carpets with a lower Tuft twist rating may feature a higher pile density to try to compensate. A higher Pile Density will help increase the longevity and durability. Manufacturers of Polyester and PET Polyester carpets often use this strategy to lower costs and increase carpet durability with limited results. 

  • You will find that carpets made from PET Polyester and Polyester fibers are less expensive than a Nylon counterpart and yet feel softer and provide a higher pile density than Nylon. Polyester is less inexpensive to manufacture. This is why they can afford to create a carpet that is more dense and less costly than Nylon.



Pile Height, Density and Face-Weight

Not having all three of these specs readily available to you might not be such a big problem if you can find or even closely guesstimate two out of three carpet specifications, then you can calculate the third using simple mathematics!


Below I explain in detail what you need to do, and how you can quickly and easily figure out for yourself all the carpet specifications you need to acquire, even if the carpet retailer or salesperson refuses to give you hardly any information at all!



Why is Tuft Twist Important?

The Number of Tuft Twists is an important factor to making sure your carpet retains its like new appearance longer. Frieze styles tend to have a higher tuft twist (over 6 twists per lineal inch) and is why they are well-known for their durability and retaining a like-new appearance longer than many other styles. 



Count The Twists Yourself!

When you look at a potential carpet, you can look closely at the tuft and count the number of twists yourself. Just remember that the tuft twist rating is based on one inch of tuft. For example, if the tuft is 1/2" long and has 3 twists, then the tuft twist is 6. 


Looped Berber carpets have twisted tufts too, but it is very hard to count them with the naked eye. Most looped Berber styles will state the Tuft Twist Rating posted on the back of the carpet sample or shown on the manufacturer's spec sheet. (ask for it)



Matting and Crushing

Carpets with a lower Tuft Twist Rating (of 3 to 5), tend to untwist or “blossom” at the tuft tips more quickly, thus creating a worn out, frizzy looking or matted down appearance. 



Can I Calculate Carpet Specifications Myself?

Here is how you can figure out carpet specifications by using simple math formulas. 


1. Let's assume you don't know what the Pile Density rating is of a carpet you are interested in buying, but you do know the Face-Weight and Pile Height:

  • Use Specification Rule #1 below...

2. If you don't know what the Face-Weight rating is of a carpet you are interested in buying, but you do know the Pile Height and Pile Density:

  • Use Specification Rule #2 below...

3. If you don't know what the Pile Height is of a carpet you are interested in buying, but you do know the Face-Weight and the Pile Density:

  • Use Specification Rule #3 below...



Carpet Specification Rule # 1:


Formula: Face-Weight x 36 ÷ Pile Height = Pile Density

  • Face-Weight is the weight of the surface fiber in ounces. (20 to 100)

  • Pile Height is a fraction turned into a decimal (3/4" = .75). 

Example: (30 X 36 ÷ 0.50 = 2160) 

In this example, what we know is that the face weight is 30 ounces and the pile height is 0.5 (one half inch). 

We can now use Rule #1 to calculate the Pile Density Rating.



Carpet Specification Rule # 2: 


Formula: Density x Pile Height ÷ 36 = Face Weight

  • Pile Density is a number based on the Face-Weight and Pile Height. (Range 1000 to 9000)

  • Pile Height is a fraction turned into a decimal ( 3/4" = .75). See Conversion Chart below.

Example: (2160 X 0.50 ÷ 36 = 30) 

In this example, we know the Pile Density is 2160 and the pile height is 0.5" (1/2"). 

We can now use Rule #2 to calculate the Face-Weight in Ounces.



Carpet Specification Rule # 3: 


Formula: 36 ÷ Density x Face-Weight = Pile Height

  • Pile Density is a number determined by the Face-Weight and Pile Height. (Range 1000 to 9000)

  • Face-Weight is the weight of the surface fiber in ounces. (20 to 100)

Example: (36 ÷ 2160 X 30 = 0.5

In this example, we know the Pile Density is 2160 and the Face Weight is 30 Ounces. 

We can now use Rule #3 to calculate the Pile Height in decimal form. 



Decimal to Fraction Conversion Table

0.0625     =     1/16" 
0.125       =     1/8"
0.1875     =     3/16"
0.25         =      1/4"
0.3125    =      5/16"
0.375       =     3/8"
0.4375     =     7/16"
0.5           =     1/2" 
0.5625     =     9/16"
0.625       =     5/8"
0.6875     =     11/16"
0.75         =      3/4"
0.8125     =     13/16"
0.875       =     7/8"

1.0           =     1" 

1.0625     =     1-1/16" 

1.125       =     1-1/8"



Carpet Prices Are Going Up!

Along with everything else we need to buy today... Carpet, Padding and Installation costs are all going up significantly. When you walk into a carpet store, the price you see posted on the carpet sample is for the carpet only. It does not include padding or installation.

The price shown on the carpet sample also does not include any extra products or services your job might require. So if the carpet only price is $3.49 per square foot, your final cost could be closer to $5.00 per square foot (or more) after adding in the cost of padding and installation. Take My Free Carpet Foot-Traffic Test



Carpet Durability Guide Chart


Carpet Durability Guide Chart - Carpet ProfessorIf you want to make wise and informed choices you need to know what grade or quality level of carpet you need to buy for your home. (Click on the image to view or print)


What is your score? I created a simple test to help you determine your level of foot-traffic you have in your home. It just takes a minute or two to take my free Carpet Foot-Traffic Test.


Then use my free Carpet Durability Chart to determine if the carpet you are considering is capable of meeting your needs and goals.



Learn more:

 - How to choose new carpet and flooring like a pro!


~ My List of Carpet & Flooring Stores ~


Recommended Carpet and Flooring Dealers"I Only Recommend Locally-Owned Stores with Superior Service, Quality Products and Qualified Installers"


Recommended By The Carpet Profesor -  Recommended By The Carpet Profesor -   Recommended By The Carpet Profesor -



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