I don't know what's the latest consensus on this topic, but I'd probably rehydrate the yeast in a cup or two of sterilized water before tossing it in. You can get away with pitching a packet directly in a 1.050-60 beer, but this is a big beer we're talking about. The osmotic pressure due to the very high gradient in solute concentration (ie due to the very high sugar content of 1.105 wort) might stress the yeast quite a bit. Maybe someone else will come in and tell me I'm full of it, but I like to err on the side of caution when attempting such a huge beer.
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