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Old 08-12-2011, 03:55 PM   #1
cheech1006
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Aug 2011
Chicago, IL
Posts: 11


I am a week into fermenting an RIS with OG = 1.136. Pitched four packs of Wyeast Scottish Ale (1728) and blew the lid off my fermenter. That prompted me to do some more research and I found that 1728's tolerance is only 12%, attenuation 69-73%. Seems unlikely that I will get down to my target gravity of 1.034 because this would be about 13.5% ABV. Even if I do get the gravity down that low, I doubt I have a shot at carbonating this beer with 1728, even if I pitch fresh.

On the other hand, if I were to pitch a fresh vial of yeast with higher tolerance/attenuation such as White Labs WLP001, don't I risk bottle bombing due to remaining fermentables? Prime/Don't prime? Different yeast? What do I do?



 
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Old 08-12-2011, 05:41 PM   #2
HopsJunkie
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Jul 2011
Hobe Sound, Florida
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Not sure what you should do, but I'm thinking of brewing an RIS myself, so I'm curious of the answer.



 
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Old 08-12-2011, 06:03 PM   #3
COLObrewer
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Jan 2009
Pea Green, Colorado
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There have been instances where the McEwans yeasts (1728, wlp028) have gone past 16% which doesn't surprise me. It cut it's teeth on wee heavies from way back, there were/are some 20 odd strains in the culture. I personally wouldn't worry too much about it as long as they're healthy and it sounds like they are, see where it takes you and go from there.

Edit: You could probably add a little yeast nutrient to be certain.
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Old 08-12-2011, 09:22 PM   #4
cheech1006
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Aug 2011
Chicago, IL
Posts: 11

Thanks for the response, COLObrewer. Seems like I might manage target final. What about bottling? Fresh yeast seems like a must right? But use same yeast strain or something more like wlp001?

 
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