How do you seal a chimney thimble?

Lay a bead of cement, onto the end of the Thimble that butts against the masonry chimney. (See Figure 7) The cement will act as an adhesive and also seal the Thimble tightly to the masonry chimney should there be uneven surface. If the masonry chimney has a smooth surface the Cement will not be required.

How do you join a flexible flue liner?





Push fit both sections of the flexible liner to be joined, into either side of the joining connector. Secure with stainless steel self tapping screws (not provided) through the holes on the component and pack with fire cement.

Can you fit a flue liner from the bottom?

You can install your chimney liner either from the top or bottom of the brick chimney stack.

What is a flexible flue liner?

Also often referred to as a chimney liner, a flue liner is a flexible tube that is connected to your stove pipe to line the inside of your chimney. It runs up the entire length of your chimney, carrying the fumes up your flue liner instead of releasing them straight into your chimney cavity.

How do you close a chimney thimble hole?

The proper way to close off a thimble port is with brick and mortar to create a solid and safe enclosure. It’s important that your chimney service technician checks that the area that gets closed off has a lining. If there’s no lining due to the flue, then a new one needs to be installed.

What do you use to seal the flue pipe?





To air seal around combustion flues, use fire-rated caulk and UL-rated collars or sheet metal cut to fit and sealed with fire-rated caulk, while maintaining proper clearance between flue and combustible materials.

How do you install a flexible chimney liner?

Quote from the video:
Quote from Youtube video: You must insert the tee snout into the existing thimble in the wall of your chimney. Skip. This step if you are connecting the liner straight down the chimney.

How do you seal a flue pipe on a stove?

For the first joint adjacent to the stove you should fill the gap with thermal rope and then cover with black fire cement, from a cartridge is the most convenient way to do this. Any other joints should be sealed with VITCAS Heat Resistant Silicone.

How long will a flexible flue liner last?

The average lifespan of a chimney liner is 15 to 20 years. After two decades you will probably need to get the entire liner replaced to make sure it’s still up to code and not a serious fire risk.

How long do clay flues last?



around 50 years

Clay tile liners and cast-in-place liners typically last around 50 years. Stainless steel flue liners generally last for 15 to 20 years (though low quality liners may not even last for five). Good quality stainless steel chimney liners often come with a lifetime warranty.

How do you clean a flexible flue liner?

Maintenance Procedures

  1. Remove the chimney rain cap.
  2. Select the proper size nylon, poly or natural bristle chimney brush to clean the liner. …
  3. Connect the chimney cleaning brush to the end of the cleaning rod.
  4. Insert the brush down the flue from the top of the chimney.
  5. Guide the chimney brush up and down the flue.

What’s the difference between 316 and 904 flue liner?



The 316 liner is suitable for most domestic wood burning stoves, whereas, the 904 is a higher grade liner, which is thicker and more resilient than the 316 and is suitable for multifuel appliances, the use of smokeless fuels and for boiler stoves, due to the slightly higher production of acidic condensates when burning …

Can you burn coal with a 316 liner?

Liner Type



The most popular lining material for stoves is stainless steel. There are two types of grade; 316 and 904. The difference between the two is that a grade 316 liner cannot burn smokeless coal and has a warranty of 10 years. The grade 904 liner can burn smokeless coal and has a warranty of 20 years.

What is a 904 grade flue liner?

Our 904 grade solid fuel chimney flue liner is approved for use in appliances that burn gas, coal, cured dry logs, smokeless fuels, cured dry peat and coke. This flexible, 150mm (6″) diameter chimney liner has high performance 904 grade stainless steel for both the outer casing and inner liner.

How long will a 316 flue liner last?

316 flue liners are perfectly fine with wood burners and log burners. With respect to Flexible Flue Liners; in general 316 grade liners carry a 10 year guarantee and 904 grade up to 25 years.

Do flexible flue liners need sweeping?



Even if you have a chimney liner, a regular sweep is essential for getting rid of any blockages or debris that can put you at risk of a chimney fire.

How long will an aluminum chimney liner last?

around 10 to 15 years

Aluminum chimney liners do cost less than a stainless steel chimney liner, however, the average lifespan of an aluminum liner is going to be around 10 to 15 years. You must never use an aluminum liner for a wood-burning appliance.