Insulation for 6 inch rigid 304 ss chimney liners?

We put it on rigid 304 liner at my BIL's place. We got the pre-insulated liner. The insulation was mounted on a metal sleeve which snaps into place around the liner pipe, then you crimp the seam. You can see it in the top pic on the following link (may not be the cheapest price here, but I gave them my business because they provided lots of info on their site, which I appreciated.)
I put the foil-backed insulation wrap on my flex liner. I laid the flex (18') on the floor on top of the insulation, the sprayed with glue and wrapped the insulation around the flex. It wasn't easy to get it on straight. If you have 4' rigid sections, it would be easier to wrap it like I did. I needed a wire mesh over the foil-backed insulation to keep from shredding it when I pulled the liner up the chimney, but you may not need that with rigid liner that is a straight shot...I don't know.
http://www.hartshearth.com/productcart/pc/viewCategories.asp?idCategory=516

Some liners, such as Dura Liner, are insulated (2 walls) and don't need additional insulation. If you'r using a single wall liner, you can wrap rock wool around it and hold it in place with chicken wire.

The guys that installed my rigid 6 inch liner put the whole thing together on the ground, wrapped it with 1/2 inch insulation, carried it to the roof and put it down the chimney. It was a cold day and they had to shovel snow off the roof too! It hangs from the top of the chimney.

Good luck,
Bill

The best thing to do is whatever the liner manufacturer recommends for their liner system. Most will have some sort of wrap insulation you can use, such as the snap lock kind mentioned above. This is usually what I use for a rigid liner. The insulation must allow the liner to move and expand when it warms up, so avoid poured insulation with a rigid.

cmonSTART said:

The best thing to do is whatever the liner manufacturer recommends for their liner system. Most will have some sort of wrap insulation you can use, such as the snap lock kind mentioned above. This is usually what I use for a rigid liner. The insulation must allow the liner to move and expand when it warms up, so avoid poured insulation with a rigid.

Click to expand...

A flex liner will expand and what not also, are poured insulation just not a good idea with either liners? Sorry if it seems I'm thread jacking

Poured is fine with flex liner. The corrugations absorb the expansion even when encased in poured insulation.