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Insulation - Blanket Wrap or Pour Down Mix

Chimney liner insulation kits help ensure safety and efficiency for stainless steel flex chimney liners. Insulation also reduces the build up of creosol and helps your chimney stay cleaner longer. Rockford has two options for you to pick from when considering flexible chimney liner insulation: Super Wrap Blanket Kits and EverGuard Pour-Down Insulation Mix. We also have Rigid Liner Insulation.

Chimney Liner Insulation Kits (Super Wrap)

Chimney Liner Insulation Kits (Super Wrap)

Everything you need in one box: precisely sized foil faced 1/2" Super Wrap insulating blanket, retractable mesh, spray adhesive, foil tape and clamps. Safer than ceramic wool (aluminum silicates). Less skin irritation — breathe easier. UL listed for use with single wall stainless steel chimney liners.

To maintain UL Listing 1777, 1/2" of insulation between the masonry and the liner provides for zero clearance between the exterior of the chimney and combustible materials. 1/2" insulation kits will add about 1.5 add- " to the diameter of the liner.

To maintain UL Listing 1777, 1/4" of insulation between the masonry and the liner provides for 1" clearance between the exterior of the chimney and combustible material. 1/4" insulation kits will add about 3/4" to the diameter of the liner.

Insulating blanket is also available in precut lengths (see below).

Each Kit Includes:

  • AES (Alkaline Earth Silicate) Chimney Flue Liner Insulation Blanket 3mil protective foil facing insulation wrap.
  • 3M Insulation Spray Adhesive
  • Stainless Steel Retractable Mesh
  • HVAC Foil Tape
  • Stainless Steel Clamps to secure insulation at top and bottom
  • Complete Installation Instructions

Chimney Liner Insulation Kits (Super Wrap)

insulation kit

The diameter below equals the size of the liner you're insulating.


Insulation Blanket Only - Precut Lengths

Insulation Blanket Only - Precut Lengths

In response to customer requests, we now offer 5' and 10' lengths of our Super Wrap 1/2 thick 4ml protective foil face insulation. Width is 24".

These precut lengths are ideal for sealing off the damper area when installing a fireplace insert with a stainless steel liner.

Insulation Blanket Only - Precut Lengths


Rigid Liner Insulation

Rigid Liner Insulation

Compress the insulation around the rigid liner by hand, until the two edges snap and lock together. Available in 24" lengths.

Rigid insulation increases the outside diameter of the liner by about 1 3/4 inches.

Rigid Liner Insulation


Chimney Insulation Mix

Chimney Insulation Mix

Everguard insulation mix is a ready mix, vermiculite based insulation material. Simply prepare by gradually adding 4-7 gallons of water. When the insulation is properly mixed, it will hold together when squeezed in your hand, and no water should come out. Pour the mix around the chimney liner, while shaking the liner slightly to let the mixture settle, then let it solidify.

This pour-down insulator is an alternative insulating method to using Super Wrap. Great for tight fitted lining jobs or insulating after a liner has been installed.It's easy to work with. It will fill dangerous voids and cracks in the masonry work while strengthening the chimney walls.

It cures into a lightweight, semi hard mass that supports a liner in the chimney and forms a thermal barrier that keeps the flue gases warm.

This product adds performance to your liner and is very durable. It is UL listed for zero clearance to combustibles. The mix eliminates moisture buildup between the liner and the chimney structure. It is accepted by building code officials, and what's better is that it can also be removed.

One bag weighs 45 lbs and covers 2.5 cubic feet. See insulation mix instructions.

Note: A chimney balloon is the best solution to stop the insulation mix from leaking into your fireplace or down into your cleanout door at the base of your chimney. For example, inflating a chimney balloon inside your chimney just below the thimble will prevent the insulation mix from filling up the flue cavity below the thimble, which would seal off access through the cleanout door. The chimney balloon should be removed, once the insulation mix has cured, before a fire is lit in the chimney.

How Much Insulation Mix Do I Need?

Chimney Dimensions:

Choose shape of chimney opening:
Rectangle or Square

Enter size of chimney opening (in inches):
Length inches
Width inches

Enter height of chimney (in feet):
Height feet

Liner Dimensions:

Choose liner shape:
Square or Rectangle

Enter liner size (in inches):
Diameter inches

You will need _____ bags of insulation mix.

NOTE: If you are insulating a fireplace with a smoke chamber, you may require additional bags of insulation. Please call us if you need assistance.

Chimney Insulation Mix   $74.99

45 lb. Bag Delivered


When do I need to insulate?
To maintain efficiency, safety, and to significantly reduce formation of creosol you will need our 1/2" Super Wrap blanket insulation kit or our Ever Guard insulation mix. This can help ensure the safety and efficiency of your stainless steel flex chimney liner. Adding stainless steel flex liner insulation can also help reduce the buildup of creosol as well.

Why insulate?
It is strongly advised that you do insulate. When you install your liner with the proper chimney insulation (chimney liner) your reline job creates an environment that allows your appliance to be as efficient and safe as possible. Plus your insurance company will love you for it. An insulated chimney liner has a better draft and stays cleaner longer, which is a benefit to any stainless steel flex chimney liner.

The Original Online Chimney Supply Co.