liner advice

[chammy]

going to install a liner i have a 6.5x11 id clay rile chimney... 6 in round with insulation wont fit can i "ovalize" a flex liner to fit or should i buy the high dollar already oval piping. thanks

 

[Ctd01]

We put in a flex king pro with the smooth interior wall no insulation and it works great and it's a breeze to install. We just did our first clean after two months and we got about a coffee cup full of crap out of it when we ran the brush down it a few times.

 

[rwhite]

How tall is the chimney? Seems like a good place to use pour in insulation.

 

[chammy]

30'

 

[chammy]

that and i can get a 40' roll ov 3200 degree half inch insulation from my buddy at the mag foundery for 50 bucks .. would like to utilize that route cause its a lot cheaper but deffinatly open to suggestions

 

[rwhite]

I've read some threads on here where people have had luck ovalizing their own and others that went a little far and tore the liner. Maybe at that chimney height someone that knows better than I can chime in and see if you could go with 5" round.

 

[ikessky]

What is the price difference between the round and the oval?

 

[chammy]

well i can only find the oval in 5 ft pieces at 166 each sothats over 900 the round 30' kit is 439

 

[pen]

With that length, if it were me, I'd be putting a 5.5 inch liner in.

If it is an interior chimney, and the chimney is in decent shape, I wouldn't put insulation around it and try it for a year then decide if I want to insulate.

If it is an exterior chimney, then I would pour thermix around it.

pen

 

[chammy]

yea its exterior the store im lookin at has 6 in flue.. how much smaller can i go

 

[chammy]

stove not store

 

[cygnus]

I have the same size clay liner. I ovalized the 6" liner down to ~4.75" and used wrap insulation. The liner dropped right down 27' feet, no problem. I was concerned that it might affect the draft but the draft is super. Well worth the time and effort for a quick installation without the cost of pre-ovalizinig.

 

[ikessky]

The only reason I worry about ovalizing myself would be if you run the risk of separating some of the seams. I like the 5.5" liner idea though.

 

[chammy]

i like the 5.5 idea too if it will be big enough for the stove

 

[chammy]

musta jacked up my math i come up with needing 518.8 bags of thermix

 

[sebring]

I have a 30' chimney also, and used a 6" flex liner. I bet I could have used a 5" liner and still would be fine. Right now Im trying to slow down the draft..

 

[chammy]

i just didnt know if since insert has6" connector if i had to stay with that ... if not ill go with 5 or 5.5 and problem solved

 

[WoodpileOCD]

musta jacked up my math i come up with needing 518.8 bags of thermix

That would be to fill his house, not his liner. :-S

 

[rwhite]

The volume of your chimney is 11*6*360=23760 in3. The volume of a 6" liner = 3.14*(3*3)*360=10173.6 in3. 23760-10173.6= 13586.4 in3. Converting that to ft3 13586.4*0.000578703704 =7.8625. Each bag of thermix covers about 2.5 ft3 so you would need about 4 bags (3.14 )bags. I would have to do the math but would thinkif you are using thermix I'd use the larger liner. Insulatiion wrap I'd use the smaller liner, if it will fit.