Insulation touching fireplace flue

[Mark P]

Is fiberglass insulation combustible? Should it be pulled away from this fireplace flue? It has been like this since 1983, but since I’m not sure, I think I’ll recommend it be pulled away. I have seen in newer construction a warning label on metal furnace flues indicating insulation should not touch. What say you?

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[hausdok]

Nope, it's not combustible. It's glass! I've seen that thousands of times and have never found where it's been an issue.

OT - OF!!!

M.

[Mark P]

Thanks Mike!

[ozofprev]

Heck with the fiberglass - how far is it from that wood?

[Mike Lamb]

I'm not sure why (heat conductivity?) but combustibles AND building insulation are not allowed within 1" of b-vents.

I've failed my way to success.

-Thomas Edison

[Mark P]

Good point, Gary. Sometimes I miss the forest for the trees.

[inspector57]

Most modern metal flues call for 2" clearance to insulation and combustibles.

The pipe needs the air to keep the pipe cool, won't work as the manufacturer intended if you bury the pipe in insulation.

Jim