Originally Posted By: clawrenson This post was automatically imported from our archived forum.
Some chimneys vent pipes are designed with a 1" clearance to combustible materials. Here in Canada that is a common requirement to meet building code. However (based on your photo) even without a heat shield, I would note concern with the insulation within that area in contact with the chimney pipe.
Originally Posted By: ckratzer This post was automatically imported from our archived forum.
James
You are correct.The fire stop should be snug.The same thing applies for a furnace vent pipe.
The metal stop is non-combustubile so the 1" clearance thing would not apply.Leaving clearance in both cases would do exactly the thing that is trying to be prevented...updraft.