12 days and still bubbling

[Painter]

For various reasons I recently made an Imperial IPA from a kit. (fermentables9.9 lbs of LME and a pound of corn sugar and Wyeast 1056 instead of the yeast in the kit). I have a Brew Belt hooked up to a thermostat so I have been able to maintain a constant temperature of 70 degrees for the last 12 days. I'm still getting some bubbling activity. I have never had bubbling activity for that long in five years of home brewing, but I have only been using the thermostat for less than a year.

Is this normal? I want to start another brew which would mean unhooking the thermostat and the current brew would cool down to cellar temperature of 60-65.

I have not taken a gravity reading, but may get around to that this afternoon.

Remove the Brew Belt?

 

[CJ-3]

I wouldn't remove the brew belt just yet.
Is it done? Probably
Is it just offgassing? Possibly.

Should you be safe and pull gravity samples to make sure? Yes, you should.

I had one that slow fermented for 2 weeks. It happens.

 

[jschein]

If that is a 5 gallon batch then the OG will be about 1.071, it needs some more time. It should finish about 1.016