Commercial Roofing

Built-Up Roofing

Built up tar and gravel roofs

Built-up roofing systems are a common type of low slope roof.

Common Types
  • Conventional
  • Inverted
Manufacturing Method

Asphalt is available in four types. As a product of the oil industry the different types are created using heat and blowing oxygen. Types one to four are used for different grades of roofing slopes. Type two and three are most common.

Application Method

Alternating layers of reinforcing plies of roofing felts bound with asphalt or bitumen are applied to build up the roofing system to the desired level of plies. In a conventional system, gravel or other surface material is then embedded into the top layer of asphalt. In an inverted system, the insulation and ballast protects the membrane. A surface coating can be applied to the roofs surface to help reduce UV effects and lower the buildings heating and cooling costs.

  • Proven time-tested system
  • Very durable
  • Weather resistant
  • Easy to repair

Godfrey Roofing Inc offers high quality built-up roofing products to commercial and industrial clients in the Ottawa region – please view the commercial roofing services section for more details.