Torch Down Roofing Underlayment

Net membrane roll for low slope roofing in white.

Torch down roofing underlayment.

The mat is coated with durable app modified bitumen and is designed for torch down application by professional roofing. Renting a large propane torch is. This video shows you how to use a torch and also tar to make a repair on a modified bitumen rubber flat roof. This membrane contains a core of nonwoven polyester mat that resists splits and tears.

Torch down roofing is a type of roofing material that has been designed for low angle or flat roofs. More product details close tri ply app granular cap sheet 39 625 in. The roofing professional will lay down an overlay board or cover board next to support the torch down roofing membrane. What type of underlayment should i use.

I originally was going to use ice and water shield but don t think i want to put torch down on top of that. As long as it is installed correctly bitumen prevents moisture build up without needing constant maintenance. If you install the smooth product cover it with aluminum coating. Secure it with roofing nails and then apply the torch down.

Modified bitumen roofing may have a granular surface as shown here or it may be smooth. Gafglas 75 base sheet for built up roofing bur is a premium roofing sheet with a strong fiberglass mat to prevent asphalt bleed through. Care must be taken to apply the overlay board correctly to prevent ponding which is when the roof is not level. 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.

Priming the underlayment is not needed. It is best to use 75 glass base underlayment. I m going to be re roofing an addition on our house that is low slop and would like to use torchdown roofing. The mat is coated with durable app modified bitumen surfaced with granules and is designed for torch down application by professional roofing contractors.

Use flashings approved by your building department. 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.