✅Basic Civil Engineering Knowledge 📌Angle of Stair Case ■25° to 40° 📌Riser of Staircase ■150 to 200mm. 📌Tread of Staircase ■250 to 300mm. 📌Thickness Of Lintel ■150 mm. 📌Height Of Parapet Wall ■1 Meter 📌Height of Window ■1.1 Meter to 2.1 Meter 📌Initial Setting Time Of Cement ■30 Minutes 📌Final Setting Time Of Cement ■10 hours 📌Thickness. of D.P.C. ■250 mm. 📌Height Of Kitchen Platform ■34” to 36” (inches) 📌Height Of Shower In Bathroom. ■80 “ (inches) 📌Weight Of Cement Bag ■50 kg. 📌Min