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Fiberglass Pipe Insulation

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  • Owens Corning ASJ Max Fiberglass Pipe Insulation is Made in the USA
  • Owens Corning ASJ Max Fiberglass Pipe Insulation Benefits
  • Iron Sizing Chart for Pipe Insulation
  • Copper Sizing Chart for Pipe Insulation
Owens Corning / Johns Manville
Unit Of Measure:
Per 3ft Section

 Product Description

Fiberglass Pipe Insulation covering is intended as a thermal insulation for both hot and cold service piping from -20°F to 1000°F.  The pipe insulation is molded from heavy density resin bonded glass fibers that come in 3 foot long hinged sections.  The fiberglass is wrapped with white All-Service Jacketing (ASJ) which has a self-sealing lap (SSL) for a quick and secure installation.  Each 3 foot section of pipe insulation comes with a butt-strip tape (matching the white ASJ jacketing) that is used to connect two sections of pipe insulation together.

Typical Uses Include:

  • Domestic Hot & Cold Water Pipes
  • Hot Water Heating Pipes
  • High Temperature Pipes
  • Dual Temperature Pipes
  • Steam Pipes (Low to High Pressure)
  • Condensate Lines
  • Refrigerated / Chilled Liquid Pipes

Choosing The Correct Size:  There are two sizes you need to choose when ordering, the "Pipe Size" and the "Insulation Thickness".  The insulation thickness is the wall thickness of the fiberglass which varies from 1/2" up to 3" thick.  For help selecting an insulation thickness see our Fiberglass Thickness Guide  To determine which Pipe Size to order please see the link below (Note: Pipe Size is NOT the same as the pipe diameter):


Installation Instructions:

To install pipe covering, simply open the hinged part of the pipe insulation and place the opening over the pipe.  The pipe insulation will self close around the pipe.  Once the fiberglass is fitted snug around the pipe, peel the release paper from the self-sealing lap and press the ASJ jacket closed from the middle towards the edges of the pipe insulation.  Make sure to rub the jacket closed to ensure a secure seal.  Seal two sections together with a piece of butt strip tape making sure to rub the tape to create a secure seal.  Additional ASJ MAX Tape is recommended for large projects and projects that require multiple cuts of the insulation.  Use of PVC Fitting Covers for elbows, tees, unions and other pipe fittings should be installed after installing fiberglass pipe insulation. 

For more information: Fiberglass Pipe Insulation Datasheet


White ASJ Jacketing:  A large majority of the pipe insulation we ship is the new Owens Corning ASJ Max pipe insulation while some larger sizes and (3 x 1/2, 3-1/8 x 1/2, 4 x 1/2, and 4-1/8 x 1/2) will be Johns Manville Micro-Loc HP.  The new ASJ Max jacketing has a poly top-coat over the ASJ paper which makes it easier to wipe clean and slightly water resistant (cannot be left exposed outdoors).

NOTE: Each unit is 3 linear feet of pipe covering. For example, if you need 9 linear feet, you only need to order 3 units.



 insulator-kit-small.pngGet a FREE Professional Insulator Kit
with any purchase of over 150 ft of Fiberglass Pipe Insulation

TIP: We highly recommend ordering a roll of ASJ Max Tape with your order of Fiberglass Pipe Insulation to ensure you have enough tape to completely seal your piping system.  Every cut made between fittings (tees / 90s etc) will result in the need for more tape. ASJ Max Tape also comes in 25'er Short Rolls for smaller projects.



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 Product Videos

Fiberglass Pipe Insulation Installation Instructions
  • Fiberglass Pipe Insulation Installation Instructions
    This is a basic tutorial that covers how to measure your pipe ...

 Product Reviews

Previous | Showing reviews 11-20 of 80 | Next

  1. Happy Customer

    Posted by Ed on 11th Apr 2018

    I replaced the insulation on the pipes for our steam boiler. Product was easy to use and arrived very quickly after I placed the order. Website was very helpful on how to measure, etc. Only suggestion is to consider thicker insulation. I ordered the recommended 1 inch thickness, but can feel some amount of heat loss through the insulation when the boiler is running. I had installed a thicker, more dense insulation on a similar boiler system (also more expensive) with no noticeable heat loss. Overall, I am very satisfied wit this insulation.

    *Ed, I am glad you are happy with our products and services. We recommend at least 1" thickness on steam piping. Although 1-1/2" or 2" thickness is preferred, most customers choose 1" thickness for the cost effectiveness and lower shipping costs.

  2. Easiest way to insulate pipes.

    Posted by Jeff C. on 3rd Apr 2018

    These come in 3' sections and include a piece of foil backed tape to seal the joint where the pieces butt together. Take the time to get the right size by using the charts on this site. With the right size you get a perfect fit. Also pay attention to how much room you have around the pipes. Although thicker insulation is better, it does you no good if you can't use the piece because there is not enough clearance. You can order thinner sections for tight spots or fill in around difficult places with pieces of unfaced batt insulation and use the tape (you can order extra by the roll) to keep it in place. I used floral wire to hold it where I wanted so I could neatly tape it up for a finished look. You can make the job look really nice with this product and the pvc covers for elbows, tees and unions

  3. Better than expected

    Posted by Peter K. on 21st Mar 2018

    I got the 1 inch insulation and it worked great! So much better quality then the junk at Home Depot. Easy to install and super fast shipping! They even included tape to tape them together in a run!

  4. Exactly what I was looking for

    Posted by Paul B. on 8th Mar 2018

    Great service! I found exactly what I was looking for and good website. Very fast shipping

  5. Absolutely the Best

    Posted by Rich B.( The Home Doctor ) on 1st Feb 2018

    At first I didn't know what to expect, but after getting this stuff I knew it would be superior to the junk available locally.
    It was shipped promptly and packaged with all I needed to get the job done. It did a nice clean professional looking job and my clients were very pleased.

    *Rich, we are glad your insulation project came out looking professional and that your clients were happy with the results. ~ BIP

  6. Excellent pipe insulation

    Posted by John V. on 30th Jan 2018

    My second order. Owens Corning insulation is an excellent product. Doesn't let heat escape, fiberglass doesn't fall apart, extremely easy to install and cover can be wiped clean. Gives a neat appearance. I couldn't find anything comparable in stores. Prices on Buy Insulation Products were very good, web site was easy to use and helpful and shipping was quick. I couldn't ask for more.

  7. Pipe insulation

    Posted by Unknown on 28th Jan 2018

    Thicker than the product at the big box stores and at a better price. Very easy to install. Used a serrated knife to make any cuts. Made a big change in the amount of heat to the radiators. Buy extra tape for any unusual cuts. Duct tape will not last.

  8. Easy to install

    Posted by Christine H. on 25th Jan 2018

    The pipe insulation was real easy to install. I was able to do most of my basement in about 3 hours. I found additional pipes that were hidden that need to be insulated and I will be purchasing from Buy Insulation Products again.


    Posted by RJB on 25th Jan 2018

    Easy install! An advanced adhesive system at the seam makes it a great product. Believe me, I searched the web for a long time to find the best price. Thanks, I am going to save oil money for decades.

    *RJB, pipe insulation saving you money is guaranteed! Enjoy the savings! ~ BIP

  10. Excellent pipe insulation

    Posted by Robert Y. on 23rd Jan 2018

    Easy to cut and apply. Follow the video directions.

Previous | Showing reviews 11-20 of 80 | Next

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