Thread: Furnace Flue Material Identification???

Hello to all,

See photos for flue material in this 1946 house. The first 2 pictures were taken in a 2nd floor bedroom "closet". Above the roof line was typical modern b-vent material (but couldn't see the transition due to inaccessible attic -go figure). The 3rd picture is at the furnace/water heater stack connection.

I'm trying to decide if it is transite pipe I'm looking at, as I personally have never run across any. Have heard of/about it, but first time I have had a job where it might be present. When knocked on with my knuckle, it sounded like I was knocking on a clay pot, or ceramic bowl, etc.

Thanks for looking.

Similar Threads:

• ABS Flue Pipe on LP Water Heater
• High Efficiency Flue Termination
• Flue pipe
• Draft hoods , combustible material
• Trained Chimpanzees Install Flue Pipe

Looks like transite to me. I see it 2-3 times/year.

Originally Posted by John Arnold

Looks like transite to me.

Basically an asbestos cement product.

Thanks for the validation guys.

Goes with the 9x9 tiles all over the place!!

The basket weave is a sign of Transite pipe. Sometimes you can find pipe with the marking still painted on it.

Of course the whole mess should be torn out and redone with matching B-vent.

If you decide to remove it, watch for powdery asbestos sometimes used under the collar connecting the two. If it is brased up good I would say leave it. It is a nonfriable material, same as on the siding of a lot of houses. I seems to have a good coat of paint on it to seal it.