Typical two-ply roofing membrane systems include a mechanically fastened base sheet and protection board. The base membrane (usually 180 gram) is fully torched to the mechanically fastened protection board. A 250 gram cap sheet is then fully torched to the base sheet flashings where roofing penetrations such as plumbing stacks and chimney pipes are primed with asphalt.
Commercial and industrial installations usually include a vapor barrier, a rigid insulation-dense deck or other fire board, a mechanically fastened protection board, a 180 gram base, and a 250 gram cap sheet. This is only one of many combinations of products that will give you a commercial roofing system.
How Does Torch On Roofing Benefit You?
Torch On roofing provides many of the same benefits of traditional tar and gravel roofs. However, Torch On doesn’t use a gravel ballast. That means the roof is lighter and there’s no gravel to clog up drains or eavestroughs.
Torch On roofs are also resilient against UV damage and rarely need repairs. They average a lifespan of around 20 years with proper maintenance and regular inspections. Torch On is one of the more popular roofing systems as it is light on the budget and has a reasonable life span.
Torch On is resistant to hail damage but it’s not recommended for restaurant roof systems as it can be damaged by oils. Additionally, if the building is in proximity to pine trees it would not be recommended as the acids from the needles will damage the roofing system.