For most residential and commercial projects we reccomend a two ply modified bitumen flat roofing system.
Torch down roll roofing is designed for all climates, expanding under heat and contracting under cold conditions without melting or cracking as other materials might. It’s this ability that gives torch down roofs their long lifespan.
Climates with frequent snow are a challenge for flat roofs because snow stays on the roof until it melts. Water-resistant torch down roofing is an excellent choice in snowy environment.
What does a modified bitumen flat roof comprise of?
Vapor barrier: This underlayment helps prevent the roof from developing condensation or moisture issues.
Insulation: Especially in cold climates, a flat or low-slope roof needs insulation to retain heat in the building/structure. The insulation is applied first and is mechanically attached to the roof deck.
Overlay board: Next we lay down an overlay board to support the torch down roofing membrane.
Base sheet: This is the first layer of modified bitumen membrane. The base sheet for torch down roofing may be secured to the overlay board by either direct heat fusing, hot mopping or with adhesive.
Cap sheet: The top membrane sheet to a torch down roofing system is a cap sheet. As it is rolled out, we use a torch to heat the bottom of the cap to the top of the base sheet. When the two layers are pressed together, they form a seal. In a two-layer torch down roof, the system is complete at this point