Can I fill an old wood stove pipe going through the concrete foundation wall with concrete mix? It is above outside grade so wondering if i can remove the pipe, block the inside and fill it from outside. Just curious if the concrete will bond and seal tightly or if more effort is needed. Anyone?

The accepted technique for measuring stove pipe is by the inside diameter. Simply because the outside diameter of double and triple wall pipe are much larger by comparison to the inside diameter. There's no standard for outside measurement that would transfer in a logical manner.

Drolets are a real pain at times. Don't buy their pellet stove. Check your stove pipe to insure its clean and not blocked. This includes spark arrestor. Is you stove cap 2' higher than anything 10' away from pipe? Refer to install manual. If you are not getting an y back draft issues with smoke inside house you may need to add on a section of trip wall pipe at the top.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/william_c9458c4c1f94e482

At just about any home & garden store you can purchase a type of media to repair this. Almost like a drywall patch but with concrete mortar. Simply use a mesh tape on the inside of hole (if possible, if not u need a very thick mortar) then fill in with mortar. U may need to apply several layers, one at a time, to build up to fill void.

You have to start outside.
First regrade slope of soil away from foundation. Add a drain and tile to direct water away from house.
If necessary dig down along foundation wall and add membrane.
In the basement, add a sump pump to pump out water to keep moisture out.
Clean basement wall, and add some waterproofing paint.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Go to Home Depot, Rona or to any hardware store, and they will show you different staff to repair the cracks.Very economical.

I've never used a ceramic chimney, or seen one for that matter. I know that the dual walled vent pipe works better when warn/hot. Can't explain it real well but the inner pipe gets hot while venting the heat and smoke. And between the inner and outer wall is cooler air, which is drawn down towards the wood burner. Creates a suction by the exhaust out of the center pipe. Mine smokes up the house when I leave the doors open and when it's a low flame inside. I'm sure you've checked on the manufacturers' specs for venting but, if you don't already know, look into the thermal dynamics of a dual walled vent pipe. And also a ceramic as you have. Has to be something with your stove install or vent pipe. Hope this couch advise helps!

This mold is from dampness in the basement.

Often this is a result of no vapor barrier installed when the insulation is put into the walls. Moisture is allowed to seep through the walls and gets into anything, even concrete.

The other problem may be from a lack of weeping tiles outside the house.

When the contractor formed the foundation walls, he was supposed to install weeping tiles to keep moisture out from outside.

Most older houses don't have this, and I'm seeing it more and more.

I would advise contacting a general contractor and getting some advice from them. You may have to have weeping tiles installed, which consists of tearing up the ground around the foundation to do so.

Then you may have to remove the flooring and wall panels as well as the drywall to install a vapor barrier.

Good luck.
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Your drill will drill a hole at any speed, the drill bit needs to be sharp to drill the mateirial.The type of wall material is important.Drywall is soft but a masonry bit should be used.A masonry bit has a flat bar accross the point and slower speeds are best.Wood walls / studs you need wood bits that are sharper and medium to high speeds are used.Concrete or Block walls again require Masonry bits.If very hard concrete as in foundation walls or filled block the use of a Hammer drill will work much faster.Good Luck

What is in the room above the basement bathroom?
And how large is the diameter of the vent pipe you need to run?
Do you have a maximum number of elbows, and runs of feet maximum you can't exceed?

Is the Frame wall above the foundation, accessible by going up thru the ceiling of the bathroom, and the elbowing over and into the outrside frame wall at that point?-- and then up a ways, and then out thru the outside wall?

Another possibility would be: How far to a window, or vent already in the basement?-- Could you run the piping there, and then out?

How thick is the concrete wall?-- Is it reinforced Concrete-- or just Masonry Block wall? A block wall is not as hard to get thru--

I know I asked a lot of questions-- but maybe it helps you think thru your options?

Le4t me know if I can help further.

Mack B