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stinkasaurusrex t1_iye1rgh wrote

I installed a fireplace insert into a masonry fireplace/chimney including a chimney liner and cap. It was not hard to do. The hardest part was getting the liner through the damper 'gap' at the bottom of the chimney and then attaching it to the back of the insert so that made a good seal. I needed a helper to get the liner down the top of the chimney, but the rest I was able to do by myself. 20' of corrugated/insulated metal pipe is very awkward for one person to wrangle and downright dangerous to do so on a roof.

From your post it sounds like you are considering a different kind of cap than I used. I did not need to modify the flue tiles at all because the cap was designed to fit over them and then held in place by screws. The liner attached to the cap with an adjustable clamp. See here:

https://www.rockfordchimneysupply.com/chimney-liners/316ti-flexible-chimney-liners/316ti-liner-components/round-liner-components/terra-cotta-top-plate.php

I bought my kit from this company, and I am happy with the result. Maybe they sell a kit that will work for your furnace/heater?

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Instant_Bacon OP t1_iye4r51 wrote

That's exactly what I need, thanks! And yeah I'll probably go with that company, they seem to have great reviews and will answer questions

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stinkasaurusrex t1_iyeoldt wrote

On the question of insulation, I recommend it if there is room in the chimney for the liner + insulation. Insulation keeps the gas hot as it exits the house which is a good thing. Hotter gasses rise faster, therefore the insulation will improve drafting. The gasses staying hot also reduces the build up of deposits from gas condensation. Maybe this is less an issue with natural gas exhaust, but with a wood burning stove you will get more rapid creosote build-up on the liner and therefore must clean it more often if you skip on insulation. You don't want a chimney fire.

Edit: I should make it clear that I am not a professional, just a DIY guy with a degree in physics. My opinions are worth what they cost you. :)

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