L-4 "Grating :
1. Grating shall be serrated welded steel bar type with 25mm x 5mm bearing bars spaced at 30mm center to center and cross bars spaced at 100mm center to center UNO.
2. All grating shall be removable and individual panel shall not exceed 0.65 KN in weight.
3. All grating panels shall be fixed to supporting steelwork by means of positive non-slip flooring grips as mfg.
4. Grating shall be type A255MSG1 unless otherwise shown on the design drawing.
5. Add steel bars stopper at corner of the angle of grating and fastener device at the edge of steel beam. Refer flat steel positioner detail on DEP standard drawing S28.022."