Most of the designs in the experiment are common in Scandinavian building practice. However, new innovative solutions designed for extreme snow drifting environments in Greenland were also tried. Also, the effect of a deflector to deflect snow particles away from the ventilation openings was tested. Over 400 times more snow accumulated in the construction allowing the most snow to enter the roof compared to the construction designed for extreme environments. (c) 2007 Elsevier Ltd. All rights reserved.