The roof and load-bearing walls of some buildings aren't strong enough to support the added weight of a green roof. Thin, lightweight systems, known as extensive green roofs, typically have a planting medium measuring 2 to 6 inches deep. Heavier, thicker varieties are known as intensive gre...
Who wants to walk out of their front door and see nothing but a concrete jungle filled with too many cars? certainly not me! In the country, there is space between you and your annoying neighbors. Having privacy in the city is like trying to grow an oak tree in a thimble. In the co...
concrete pipe, the plastic pipe shows the big advantages, such as anti-corrosive, less leakage, light weight and easy installation. But the seriousdisadvantageof the plastic pipe is the low elastic modulus, e.g. polyethylene EP value is about 800 Mpa. While the elastic modulus of carbonsteel...