Old Coal boiler and bituminous stoker questions

Re: Old Coal boiler and bituminous stoker questions

PostBy: jefsboys On: Mon Nov 21, 2011 11:43 pm

I can tell you this house has done a lot of settling over the years. I have seen that in the plaster walls that I have had to repair.
I am also about 150-200 yards away from train tracks. When those trains go by loaded with coal the house shakes. I wish I could get one of those train cars to stop and drop off 40 ton of coal. :D

I have taken 4 videos of the chimney. I am not to pleased with what I have noticed but I will let you be the judge. The crack begins in the basement and seems less and less as I get higher.
The first two videos are in the basement are different sides of the chimney.
The second on the first floor.
The third on the second floor.
The chimney sticking out the roof looks brand new with fresh mortar.


Stove/Furnace Make: Weil McLain Co
Stove/Furnace Model: Series 5

Re: Old Coal boiler and bituminous stoker questions

PostBy: Berlin On: Tue Nov 22, 2011 1:16 am

vertical cracks that travel through many courses are not great, but I believe that it's a combination of possible chimney fires that occurred long ago the house settling/shifting. I would guess that the floor joists box tightly around the stack and the foundation of the home has cracked/been repaired. This has applied some stresses to the stack over the years leading to those cracks. On your clay soil make sure that you have good drainage around your home, gutters/w/ downspouts and direct all water well away from the foundation. The basement and first floor cracks I am NOT worried about, they should still be sealed as good as possible with unsanded thinset/hydraulic cement. Where the old thimbles enter the stack at various locations they need to be removed and filled with either brick (chip the broken pieces out and insert new full bricks/w /mortar) or filled with a stiff mix of high strength concrete. If any of these thimbles are thickwall metal that would go a long way toward explaining your cracks (high rate of expansion pushes out on the stack around the thimble).

The area that definitely needs attention is the second floor where the left side of the stack has pulled away from itself. I'm not sure how accessible that will be, but you need to tear out the bricks and fix that entire area with new brick and type N mortar (softer mortar, don't use type S). In a perfect world I would apply quickrete's quickwall fiber reinforced surface bonding cement (available at lowes etc) to the entire exposed 1st and second floor chimney after all the other issues have been addressed. Although you might like the brick, this would go a long way toward adding significant strength to the structure.
Hot Air Coal Stoker Furnace: Will-Burt Combustioneer 77B
Coal Size/Type: Ohio BITUMINOUS pea stoker coal