Figures 01 a and b
Roof with cold loft
a. Cold, unventilated loft space with all ventilation between the roof underlay and roof covering
b. Cold, ventilated loft space with air stream flowing through the loft itself
This Design Guide describes the structure and design details for two alternative solutions for pitched wooden roofs with cold lofts. Cold lofts can either be designed as a cold, unventilated loft space with all ventilation coming between the roof underlay and the roof covering, see Fig. 01 a, or in the traditional way as a cold, ventilated loft space with an air stream flowing through the loft itself, see Fig. 01 b. Having a cold, unventilated loft space is a relatively new solution, but experience with it is good so far.
This Design Guide deals with interior air and vapour tightening, thermal insulation, ventilation and exterior tightening against wind, rain and snow.
The Guide also provides structural measures that will delay fire spreading to cold lofts.
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