crimping stovepipe at flue collar

[woodburner 53]

I have an old Jotul 602, with a 125mm smoke outlet. 5" is 127mm so Jotul sent adapters with these stoves sold to all its US customers, from what I understand. I already bougt 5" black pipe & double wall pipe since I only found out about this later. Question is, jamming the black stove pipe into the smoke outlet at the stove. It's 2 mm larger than the outlet. One poster said with a "heavy crimp." Could I cut the pipe where it crimps a little bit then ease it in & coat it in furnace cement from inside? Or just stove cement around where the pipe enters?

I don't want to return all this pipe for 6 inch with an adapter, plus I had a custom made wall pass through for 5 inch made.

 

[stoveliker]

I would crimp it; cutting is not necessary and stove cement is a mess (and won't last long).

If need be, get a thin fiberglass gasket.

You'd need something like this to increase the corrugation so that the diameter decreases.

 

[begreen]

Repeating the crimp a few time around with a good crimper will deepen the crimp. Malco makes good 5-blade crimpers. That's what I use.

 

[woodburner 53]

Got it, so you're saying a crimping tool & say a 1/8 fiberglass gasket. Do you stick the gasket around the inside then jam the pipe in? Or jam the gasket in after the pipe's in? I'll give it a shot. Thanks a lot

 

[begreen]

If a gasket is needed, flat gasket tape works well for filling narrow gaps.

 

[stoveliker]

Look for gaskets that go around window edges in stove doors.
But only if you have gaps after crimping.

 

[EatenByLimestone]

If you taper the crimp, you shouldn’t have a gap big enough to cause problems. You’re only trying to shrink it 2mm.

Just take it slow!