On Oct 1, 8:16*am, " wrote:
I'm adding 12" to the top of my chimney flue. *I'm trying to get it a
little taller then the gas fireplace flue that's right next to it -
the smell of the smoke comes down the gas flue.

So I'm not an expert with mortar. *Any tips on mortaring this 13x13x12
pipe? *Won't the weight of the flue pipe squeeze a lot the mortar out?

Thanks
JaKe

12" may not do it, you are back drafting, you are also pulling down
Co, a poison.