Membrane/Flat Roofing
TORCH ON: Torch on roofing consists of binding two layers of modified asphalt using a torch. The resulting membrane creates a surface that is resistant to UV & creates a waterproof barrier, bothbeing ideal for BC’s climate. Torch on systems are usually applied on flat or low slope roofs where snow or rain can easily collect and sit for extended amounts of time. A ‘typical’ system consists of a base sheet which is either mechanically fastened or glued to the surface, then the layer of cap (top) sheet is slowly unrolled onto the base while the torch is applied to it. Underneath the base sheet is where the ‘roof buildup’ rests. This usually consists of insulation topped with what is called a protector board. Torch on membranes can also be applied to walls to create a waterproof lap over joints. Often, architects require a membrane to go over a wall before metal flashings are used as finishing.
TPO & PVC: Thermoplastic Polyolefin (TPO) or Poly-Vinyl Chloride (PVC) membranes are thin, pliable and waterproof coverings used to protect roofs against the elements. TPO installation consists of three layers namely TPO based top and bottom sheets with a sheet of special fabric in between for reinforcement. TPO has grown in popularity over the last few years as it can be supplied in various colours including beige, tan and even encrusted with copper flakes. As the technology keeps improving, the possibility of all types of finishes is endless.
ALSAN: Alsan flashing is a patented component that is liquid applied to some hard to access areas such as underneath upstands and around bolts to create a waterproof seal.