Water Proofing Work Of Terrace Sloped Roof Slab Of The Office Lab. Building At Radio Astronomy Centre, Ncra Tifr, Post Box No. 8, Udhagamandalam Ooty, Dist Nilgiris State Tamilnadu Pin 643 001 Water Proofing Work Of Terrace Sloped Roof Slab Of The Office Lab Building At Rac Ooty