The scaffolding can be divided into single line kind and double lines kind and each of them has its own advantages and disadvantages.

Single line scaffolding is for the purpose of complete the construction of the parts on outside wall and its elements. One end of the transverse tube connects to the longitudinal tube while the other end will connect the wall. The single line tube

can save construction material but there will leave holes in the wall. However, the stability and application range will be limited, so will its erection height.

The double line scaffolding has both inside and outside standing tubes with a sound stability. However, it costs much more building material then single line kind.

And the transom shall not be set downside the scaffolding and there shall leave no scaffolding holes in the design and

there shall be an apron wall with a width less than 1m. Door and hole on the masonry shall be 200mm away to the two sides and within 450mm to corner.