Half turn stairs is the one which has its direction reversed, or changed for 180 0 . Such stairs are quite common. These may be of three types:
Dog-legged or newel half turn stairs.
Open newel half turn stairs.
Geometrical half turn stairs.
Dog-legged stairs
This name is given because of its appearance in sectional elevation. It comes under the category of newel (or solid newel) stairs in which newel posts are provided at the beginning and end of each flight. These may be of two forms: (i) with half space landing, and (ii) with quarter space landing and winders. Generally the half space landing type, (i.e. without winders) is more common, as shown in figure. There is no space between the outer strings of the two flights.
Open newel half turn stair
Open well or open newel half turn stair has a space or well between the outer strings. This is the only aspect in which it differs from the dog-legged stair. The additional width is required between the two strings may vary from 15 cm (min) to 100 cm. When the space left is more, a small flight containing two to four steps may be introduced at the turn, between the two quarter space landing, as shown below. Otherwise, for small width well , a half space landing may be provided as shown in figure.
Geometrical half turn stairs
The essential features of this type of stairs are that the stringers and the hand rails are continuous, without any intervening newel post. These may be either with half –space landing or without landing.
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