Chrome Cover Fence
Fence with chrome covering is protec from corrode, but the age of this protection is deppend on the thicness of chrome cover . The example of fence with chrome covering as on he picture below:
Roof and Roofing
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The covering of the top of a building, or roof on project management, consists of three major components:
- The structural framing members
- a stiff membrane or roof deck
- Spanning structural members
- A waterproof outer layer of roofing
The earliest roofing materials were probably mud and sod supported by logs and woven reeds. The early Greeks and Romans manufactured kiln dried clay tile to cover their public buildings and dwellings, clay tile is still popular. Bundle of straw or reeds tied to horizontal framing timbers formed the roofing for the thatched cottage in medieval Europe, and slate was used throughout the Middle Ages as a covering for the great cathedrals. By the 1500s copper sheets were pounded out by hand and used in limited quantities. After that time much of the slate and the roofing was replaced by copper, which is still widely used. Sheet lead has been used as a roofing material for centuries; a lead roof on the Hagia Shopia is still in good condition after 1,400 years.
Roofing shakes, split from straight grained woods such as Western red cedar, or uniform, sawed wooden shingles have been popular roof coverings, particularly on houses in North America Steel, Aluminum, copper, lead, various alloys. The metal used may be in either flat or corrugated steels, joined together with specially designed joints that slow for expansion and contraction during temperature change.
Asphalt and coal tar pitch came into general use as roofing materials after 1892, when a chemist developed an asphalt-impregnated paper for that purpose. Roll roofing and asphalt tiles are made of heavy felt saturated with asphalt or coal tar pitch. Mineral granules are rolled into the upper surface while the asphalt is still soft. Roll roofing is nailed or fastened to the roof deck with hot asphalt, coal tar pitch, or an adhesive in order to form a finished roof. Asphalt shingles are nailed or stapled to a wooden roof deck.
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