Start cool at about 50°F (10°C), and hold there for the first forty-eight hours. For every day thereafter, increase your temperature by 1°F (about 0.5°C) for ten days. After it’s been in the fermentor for twelve days, it should be at a steady 60°F (15.5°C). Activity in the airlock should be low (but not absent). At that point, I let that sucker free rise to the warmest temperature I can find in my brewery. Why? To ensure that my yeast goes back and does a healthy diacetyl cleanup and scrounges ...
From BYO Magazine jan feb 2019 p. 54. Notes on Imperial yeast. LHBS says the lager yeast is great for this style beer. Lagering unnecessary. Just reduce temps as long as possible He fermented in basement and produced great beer. I will be using a fermentation chamber converted fridge. Will see how it goes.
Abbreviated brew day version