Crack in exhaust vent

[mskif]

I had my gas boiler flue relined in a masonry chimney last month when my wood stove was installed. The liner is about 35 feet. There is now a crack in the exit. I can't remember what they used to seal the exit but what can I use to patch it up? Also, I use the gas steam heater to supplement the wood stove. Should I avoid using it until this is patched? Thanks.

 

[Dave T]

If it were me I would use hi temp silicone to seal the crack then remove the elbow use a metal trim ring or wall flashing and fasten it to the red brick using masonry fasteners that will help support the pipe at the wall and maybe prevent future sagging, I would try to find one prefabricated use a brush and get all the loose flakes off the brick where the trim ring will touch run a bead of silicone behind the ring and around the outsides of the ring thats what I did here is a pic of mine through the basement wall and it works great..Dave