Providing and laying four courses water proofing treatment with bitumen felt over
roofs consisting of first and third courses of blown bitumen 85/25 or 90/15
conforming to IS : 702 applied hot @ 1.45 Kg per square metre of area for each
course, second course of roofing felt type 3 grade-I (hessian based self finished
bitumen felt) and fourth and final course of stone grit 6mm and down size or peasized
gravel spread at 6 cubic diameter per square metre including preparation of
surface but excluding grading complete with. Bitumen felt (hessian base) type 3 grade I conforming to IS : 1322.
Providing and laying four courses water proofing treatment with bitumen felt over
roofs consisting of first and third courses of blown bitumen 85/25 or 90/15
conforming to IS : 702 applied hot @ 1.45 Kg per square metre of area for each
course, second course of roofing felt type 3 grade-I (hessian based self finished
bitumen felt) and fourth and final course of stone grit 6mm and down size or peasized
gravel spread at 6 cubic diameter per square metre including preparation of
surface but excluding grading complete with. Bitumen felt (hessian base) type 3 grade I conforming to IS : 1322.
%20and%20fourth%20and%20final%20course%20of%20stone%20grit%206mm%20and%20down%20size%20or%20peasized%0Agravel%20spread%20at%206%20cubic%20diameter%20per%20square%20metre%20including%20preparation%20of%0Asurface%20but%20excluding%20grading%20complete%20with.%20Bitumen%20felt%20(hessian%20base)%20type%203%20grade%20I%20conforming%20to%20IS%20:%201322.?unique=ceb1e1b)