Irimoya-zukuri is a combination between the hipped and the gable roofs, combining the advantages of both types. The hipped roof gives stability to the building and it is often used in places with strong winds, while the gable roof is recommended in areas with heavy snow.
And as you can see from this photo taken inside the Heian-jingu in Kyoto, Irimoya-zukuri also ads to the building's aesthetic appeal...
EXIF info:
Nikon D700
Lens: 24-70mm F/2.8G
Focal Length: 55mm
Aperture: F/5.6
Shutter Speed: 1/640s
ISO Sensitivity: ISO 1250