Chimney Liner Insulation

ProFoil

This flexible aluminum foil-faced ceramic fiber blanket wraps around and insulates the liner. It helps the liner to warm up quickly, to establish strong draft, reduce heat transfer to the outside of the chimney, and reduce condensation. A double layer of the 1/4" thick 8lb. density blanket is required for applications where combustible materials are less than the code specified clearances from the chimney (usually 2"). The ProFoil listing allows combustible materials to be in direct contact with the masonry chimney when installed in this fashion. Tape seams with AluFoil tape, then slide ProMesh wire mesh over insulated liner, stretch mesh and clamp at top and bottom with clamps. Please refer to our complete VENTINOX installation instructions for further details.

TherMix

TherMix is a lightweight masonry insulation product. A semi-permanent material, it will stay in place when installed yet can be removed. Dry weight per cubic ft. installed is approximately 20 lbs. TherMix is UL Listed as an insulation component for a number of flue lining systems.

Steel chimney liner insulation. Modular masonry fireplace insulation.

TherMix Was Designed To:

• Maintain consistent liner temperature, therefore reducing condensation.
• Maintain safe temperature levels on the outside of the masonry shell.
• Prevent ignition of combustibles on the inside of the masonry shell.
• Stabilize masonry chimneys.

Limitations

TherMix is an insulation component only, not a chimney flue liner. TherMix should be used only when specified in a liner manufacturer's installation instructions. Installed TherMix should not be left exposed to the elements.

Materials

• Expanded vermiculite conforming to ASTM C516-80, Type 1.
• Air entraining agent.
• Portland cement conforming to ASTM C150-68, Type 1.
• Clean water, free from deleterious amounts of acid, alkali and organic materials.
• MSDS available upon request.

Mixing

• Place TherMix in a mixing container.
• Introduce 7 to 9 gals. of water per bag gradually, to achieve proper consistency.
• Mix thoroughly for 1 minute after proper consistency has been achieved. Do not overmix.
• Place mix within one hour of preparation.

Appearance of Properly Prepared TherMix

• Has uniform color.
• Has uniform air bubble distribution.
• No dry or unmixed material visible.
• Has damp granular consistency and pours loosely with some small clumps.
• No water should appear between the fingers, when a handful of TherMix is squeezed hard.

Hints For Good Mixing And Placing

• Have a clean mixing container such as a mortar pan or mixer.
• Do not add any ingredients to prepared TherMix.
• Do not overmix.
• Follow specific liner manufacturer's installation instructions.
• Avoid excessive water, so that mix flows freely from mixing container. Excessive water causes clumping.
• Do not pack or tamp the mix.

Curing

Like other masonry materials, TherMix is fully cured after 28 days. 65 to 70 percent of this process takes place within the first week after installation.

Drying

Drying time depends upon the following factors:

• The thickness of TherMix installed.
• The amount of water used.
• Permeability of the surrounding masonry shell.
• Weather conditions.
• Appliance startup and operation.