Flock Of Birds And Roof with yellow sky

[he top covering of a building that prevents the ingress of weather into the building interior. Roof designs come in 'pitched', 'low slope' or 'flat' form; however, roofs should never be truly flat. Flat roofs are commonly found on industrial/commercial type structures while low slope is found on pre-fabricated or steel structures such as arenas. Pitched roofs are the primary design found on residential homes. The most common type of flat roof for industrial/commercial structures are the conventional built-up-roof (BUR) assembly and the protected roof membrane assembly (PMRA)The most popular roof membranes are the 4ply (felt and asphalt), the 2 ply modifued bitumum and the single plies such as the elastomeric (EPDM) and thermal plastic (PVC), drains provide run off for rain and snow. See more at Wikipedia.org...]

>For other uses, see Bird (disambiguation). Many - see section below. Birds are bipedal, warm-blooded, egg-laying vertebrates characterized primarily by feathers, forelimbs modified as wings, and hollow bones. Birds range in size from the tiny hummingbirds to the huge Ostrich and Emu. Depending on taxonomic viewpoint, there are about 8,800–10,200 living bird species (plus about 120–130 that have become extinct in the span of human history) in the world, making them the most diverse class of terrestrial vertebrates. See more at Wikipedia.org...