You could:
   Check with the Provincial Apiculturist John Gruszka  (306) 953 2790
 
   or get the publication from Alberta Agriculture:
 
   Darby, D. 1988 Overwintering buildings for bees. Engineering Branch,
   Alberta Agriculture, Lethbridge, Alberta
 
   or check the review of overwintering in The Hive and the Honeybee 1992,
   pages 852 to 868.
 
 
   Kerry Clark, Apiculture Specialist
   B.C. Ministry of Agriculture
   1201 103 Ave
   Dawson Creek B.C.
        V1G 4J2  CANADA          Tel (604) 784-2225     fax (604) 784-2299
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