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Discuss Can you seal a flue with expanding foam? in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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Getting mixed answers about this. As far as i know expanding foam around a flue is an AR. Does any body have a concrete answer?
 
Why would you AR it please explain what kind of risk is it causing ? I’d personally class that as NCS.

A flue not sealed through wall is AR and potentially ID depending on the situation.
 
Yea you can and thats ok but im saying if its already been done and installed. It would class as an AR? Fire retardant expanding foam is pink i think
 
If it's on fire you may have a bigger problem

Foam to hold in place then mortar
 
Cheers. Just found out that some models of boilers alow and some doesnt. So it clears up nothing lol. Just have to check man if available
 
Tbh it grips my she it that when you install a boiler and one of the last thjng is to mix cement and plaster up.
Makes a right mess outside and in imo
 
How you going to slide a rear exit flue out the way to replace an expansion vessel..... obviously the type of boilers that have them behind.
 

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