Furnace Flue Material Identification???

[Shane Pouch]

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.

[John Arnold]

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

[Jerry Peck]

Looks like transite to me.

Basically an asbestos cement product.

[Shane Pouch]

Thanks for the validation guys.

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

[Bob Harper]

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.

[Damon McCarty]

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.