I lived in the Phillipines for a couple years, and the use of bamboo is very common there. Bamboo is commonly used as an addition to many houses's roofs over there, due to its great UV protection capablities as Abihijit mentioned.
 how fast does bamboo grow?
Could you tell me what variety of bamboo grows 4 feet in 24 hours? That is very intriguing statistic indeed! do you know this from experience or through research? please cite the source of this.