Flat Roof Waterproofing. Roofing, Waterproofing Chopped out 2 x full bores and installed new ones. Removed old system and installed new system. 10 year Guarantee. Sika Torch On Skills Posted on September 15, 2015 ← 25 year old Roof Restoration. Fascia board and Seamless Aluminum Gutters Installed 250m. →