Cappings and copings are used to cap the tops of masonry parapets and freestanding walls to prevent rainwater from penetrating into the construction below. They can be made from profiled metal such as lead, aluminium, zinc, copper and plastic-coated steel, or by using special bricks or masonry.
What does topping off mean in construction?
A 'topping off' ceremony is a long-standing tradition of construction workers, particularly steel workers, to commemorate the completion of a building's structure – specifically the placement of the final steel beam.
Why do builders put trees on top of buildings?
Many people have asked why developers leave those trees on top, and it is quite interesting. The construction tradition dates back to pre-Dark Age Scandinavian cultures and was thought to appease the tree-dwelling spirits of their ancestors who were now displaced because the trees were cut down.
What is the topping out ceremony tree?
The topping out ceremony is held once the last beam is placed atop a structure. There is evidence that this practice dates to at least 700 AD. Scandinavian mythology at the time held that each tree had a spirit of its own, and that people originated from trees and returned to trees after death.
Why is capping required?
Capping is required in order to provide a smooth, plane (within . 002″), parallel surface for the bearing block and platen of the testing machine to contact. The basic requirements for capping compounds are that they not only achieve the above, but also exceed the compressive strength of the material to be tested.