6. Cornices
If width of Bogh is b then thickness of Bogh a is b plus 25mm. Minimum projection of Bogh equal to b and maximum a.
Minimum spacing b' between these Bogh is 1.75b and maximum 2b.
The projection c of the Dhung and Pedma is normally equal to b.
The minimum size of the Bogh for Rabsel shall be 115 x l40mm and maximum 150 x l75mm.
The size of Bogh for Payab windows shall be 110 x l35mm minimum and 125 x l50 maximum.
Projection of the Bogh on Payab window may vary according to the thickness of the wall.
The size of the Dhung to be considered would be its height rather than its thickness. Therefore, the minimum height of the Dhung shall be 125mm and the maximum 175mm for Rabsel and Payab. The size of the Dhung over the Kachhen is usually restricted by the beam depth in RCC structure.
Illus 6.1a
The minimum thickness of the Pedma shall be 50mm and maximum 75mm.
When Pedma and Choetseg are used together the total thickness shall be 100mm.
The minimum size of the Tsechukhanyim shall be f=125 and e=150mm. The projection shall be equal to e or its depth.
The depth of Jang Dhung e is usually equal to the depth of the Tsechukhanyim.
Illus 6.1b
Illus 6.1c