insulation touching pipe

[stefan]

Greetings,

Just checked out the work of my chimney installer and found that fiberglass (pink) insulation is touching the doublewalled stove pipe in our attic/kneewall - does this violate the 2" clearance rule. The installer didn't seem to think it was a problem.

 

[LLigetfa]

Insulation shouldn't touch. They make a heat shield that goes between the pipe and the insulation.

 

[snowtime]

It should not touch. There are 2 reasons. One is pink insulation is not fire rated second is insulation touching the pipe will cause a hot spot. The pipe will get hotter at the spot of contact.

 

[djarseneault]

Installer is incompetent. Air space requirement means AIR SPACE, insulation may NOT touch pipe.

 

[begreen]

I'd go over the rest of the installation carefully and check to see what else the installer didn't think was much of a problem. Make sure all of the connector pipe has 3 screws per joint.

 

[damifino]

How is this situation different than wrapping stainless liner in insulation or pouring vermiculite type insulation around stainless liner?

 

[djarseneault]

How is this situation different than wrapping stainless liner in insulation or pouring vermiculite type insulation around stainless liner?

Stainless liner is contained inside a chimney and made for that purpose. Chimney system pipe (class A) is designed to be exposed near combustible surfaces and already has insulation inside the outer pipe.

 

[stefan]

Thank you -- guess I need to check things out further.

Is there supposed to be some kind of device that will allow my kneewall to stay insulated? If I remove the pink insulation, all that is left is a big gap between where the hole was cut in the roof and the double walled pipe -- there is the thin metal sheet that covers where the pipe exits the roof and blocks the weather from coming in, but that seems inadequate.

 

[wolinski]

so if your using flex pipe going thru a fireplace, is it ok to have pink no faced insulation touching the flex pipe
. at the top of the chimney I was going to stuff insalation around the flex pipe 2 feet down. right below the cap plate

 

[jqgs214]

Pink insulation is not the product for that application, try kao wool (spelling?) that is fire rated insulation.

 

[wolinski]

where on Long Island can you get kao wool, I have some fire proof insulation, i think its rock wool, but its very fiberous, and i thought if i used it it might wind up in the hous. I was going to have an isntaller put in my stove and he was going to use pink insulation, his price for the install was too high and i wanted to see if i could do it my self. The pink stuff doesnt burn, it just melts

 

[LLigetfa]

Double-walled metal chimneys should not have insulation touching as already mentioned, that can create a hot spot since the heat cannot dissipate. Check with the chimney manufacturer.

Many chimney manufacturers offer a heat shield for attic spaces and I think they are a very good thing to have. I run a continuous heat shield from the firestop above the stove right up to the roof flashing. It helps to keep the chimney a little warmer and should a fire burn through the chimney, it affords one more layer of protection.

 

[djarseneault]

Double-walled metal chimneys should not have insulation touching as already mentioned, that can create a hot spot since the heat cannot dissipate. Check with the chimney manufacturer.

Many chimney manufacturers offer a heat shield for attic spaces and I think they are a very good thing to have. I run a continuous heat shield from the firestop above the stove right up to the roof flashing. It helps to keep the chimney a little warmer and should a fire burn through the chimney, it affords one more layer of protection.

What he said X2 ^