can i stuff roxul up the chimney?

I would need to remove my insert completely in order to install a block off plate. Can I just remove the surround trim and stuff a bunch of roxul up there? It will be coming in contact with the stainless liner. Thanks!!

Subscribing for the discussion.

I don't have any experience with Roxul, but when I installed my liner kit, I rolled a sort of horse collar out of the foil faced insulation to wrap around the bundle and close the gap to the existing flue.

I'll be curious to hear advice from others here?

Cheers!

I have mine in contact with the ss liner, I believe Roxul would need to get to 2,000 degrees for it to burn, if you get it that hot you got more issues to worry about.

Thanks. If that's how hot it needs to get to burn I'm good.

Shouldn't be any problem with Roxul up against stainless liner. Until yesterday, I had fiberglass insulation up against mine, now have Roxul which handles even higher temps. The fiberglass up there for two seasons came out looking new, no melting at all. My only concern with your approach is that you probably shouldn't pack it in there up against the stove top. Pulling out the stove is really no big deal. Just set up some bricks and plywood to match level then slide it out. (remove screws for liner adapter) Mine is very heavy but slid fine with two of us. To go back in we just used a thin piece of sheet metal between the stove top and the liner adapter. It basically worked like a shoehorn going right back in place and put a little up pressure on the liner.

It was an absolute nightmare hooking up the liner to the stove as I have a Very tight fit. That's why I don't want pull the stove out.

I have a ton of Roxul left over maybe Ill insulate as much of the liner as I can going from the top down. Good stuff Bart.

I burned all of last season with Roxul stuffed up around the liner. This year i had to pull the insert, so i got to inspect it. Like BB, not even a hint of heat issues, looks like it did when i put it there.

You dont have to pull the stove to install the roxul, you dont have to pull the stove if you want to put in a block off plate either, there should be plenty of room to work, I did mine without moving the stove, block off plate in two pieces.

That's exactly what I did and it seemed to help. I also shoved it up from below. It has been in there 2 years and I have never had an issue, yet.

Did this give you a weaker draft? I packed some around my liner where it goes up to the chimney and it seems like it has reduced it some.

My draft didn't change at all. If anything it improved my already rocket booster draft

Roxul is Fireproof, it is the only insulation rated to be next to appicance flues for burining gases, ie Nat gas or wood exhaust. Even saw it on "Holmes on Homes"!! The stuff is like a shredded rock i think so its not going to burn regardless, maybe break down? But like said if your chinmey is 2000F+ your wood contact to the masonry will be spontaneously combusting at that point!!

So Yes you can pull the trim if you can do that then stuff it up the chimney around the liner. I have to pull my insert out to even get at my trim anyway?

Theres a fire FAQ on the Roxul site which says it hasn't been approved for use around a gas flue. We all know it works for this application, and Roxul probably could be approved for this application if it wanted to. Just didn't want anyone to be thinking they are home free.

OOPS, well maybe in Canada? Cause thats where Holmes is, he said in the episode...." NO you cant have fiberglass next to the gas flue vent... what does it need to be (talking to one of his girls he teaches and has helping him) the girl replies Roxul? Right in contact it needs to be Roxul".. Thats where i got it i took it for gospel hearing it from MIke himself!

If you where to stuff it down your chimney to insulate your ss liner how would you do it? Im thinking I have to break it in chunks and stuff it down the chimney and insulate the top half of the liner.

The top plate air seals the liner in my chimney, the bottom block off plate seals and insulates. I just stuffed it up around the smoke shelf and covered with some galvanized sheet steel.

http://www.hearth.com/talk/threads/poor-mans-block-off-plate-ii.73018/

"Google" roxul pipe insulation. They make pipe insulation for all sizes of pipe...I believe it was for pipe from 1/2 inch up to several feet wide. Each size of pipe has different thicknesses of insulation available as well.
I was going to use it when I put in a 6" ss liner last year. The one I looked at came in 4 foot lengths x 1" of Roxul. All you do to install it is slide the 1st length over the liner, push it down the pipe, install the next one, push it down...and continue until finished.
I didn't do it because my liner is in an interior chimney - so probably didn't need it. Turns out I don't need it - the liner works great with great draft for the BK.
If memory serves me right, each 4' section of the insulated 6" pipe cover was around $6.00. Would have cost me $36+/- to do a 21 foot chimney. It also would have been very easy to install if it was installed at the same time as the liner.

way cheaper than the $300 that they charge for say 15ft of insulated 6" liner.

My top plate has air gaps where the liner is clamped to the top plate, its far from an air tight seal!! I put fiberglass all around the top of the chimney it helped to hold the liner in the middle for the top plate so that it would not be crooked but more importantly that it would make a much better air tight seal. The liner is say 6.5"s outer diameter and the top plate is probably 6 3/4 to 6 7/8"s, so there is a pretty good gap if you look at it from the top down you can see this gap. The clamp pulls the liner tight in the top plate and kid of snugs it to one side. All liners are made different I guess, mine is from chimney liner depot.