Torch Down Roofing Underlayment

Net membrane roll for low slope roofing in white.

Torch down roofing underlayment.

I originally was going to use ice and water shield but don t think i want to put torch down on top of that. Care must be taken to apply the overlay board correctly to prevent ponding which is when the roof is not level. Renting a large propane torch is. Torch down roofing is a type of roofing material that has been designed for low angle or flat roofs.

The roofing professional will lay down an overlay board or cover board next to support the torch down roofing membrane. More product details close tri ply app granular cap sheet 39 625 in. The mat is coated with durable app modified bitumen and is designed for torch down application by professional roofing. If you install the smooth product cover it with aluminum coating.

I m going to be re roofing an addition on our house that is low slop and would like to use torchdown roofing. This video shows you how to use a torch and also tar to make a repair on a modified bitumen rubber flat roof. Gaf tri ply app smooth is a strong resilient membrane that is suitable for new or reroofing projects as well as for use as flashing. What type of underlayment should i use.

As long as it is installed correctly bitumen prevents moisture build up without needing constant maintenance. This membrane contains a core of nonwoven polyester mat that resists splits and tears. Gafglas 75 base sheet for built up roofing bur is a premium roofing sheet with a strong fiberglass mat to prevent asphalt bleed through. These steps show a torch down method which looks a bit scary but actually is not too difficult.

Secure it with roofing nails and then apply the torch down. Torch down roofing consists of modified bitumen which is similar to asphalt. It is best to use 75 glass base underlayment. Priming the underlayment is not needed.

While it can last up to 20 years installing torch down roofing can be a dangerous process and as such tends to cost more than traditional roofing materials. Use flashings approved by your building department.