Torch Down Roofing Underlayment

The roofing professional will lay down an overlay board or cover board next to support the torch down roofing membrane.

Torch down roofing underlayment. It is best to use 75 glass base underlayment. Renting a large propane torch is. Torch down roofing consists of modified bitumen which is similar to asphalt. The sealed sheet also serves as an effective flame retarder for the application of torch applied modified bitumen membranes.

Use flashings approved by your building department. Care must be taken to apply the overlay board correctly to prevent ponding which is when the roof is not level. As long as it is installed correctly bitumen prevents moisture build up without needing constant maintenance. I m going to be re roofing an addition on our house that is low slop and would like to use torchdown roofing.

Tri ply 75 base sheet is a premium roofing base sheet constructed with a fiberglass mat reinforcing that is coated on both sides to ensure a closed sheet design to prevent asphalt bleed through. 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. I originally was going to use ice and water shield but don t think i want to put torch down on top of that. This video shows you how to use a torch and also tar to make a repair on a modified bitumen rubber flat roof.

These steps show a torch down method which looks a bit scary but actually is not too difficult. The mat is coated with durable app modified bitumen and is designed for torch down application by professional roofing. Gafglas 75 base sheet for built up roofing bur is a premium roofing sheet with a strong fiberglass mat to prevent asphalt bleed through. If you install the smooth product cover it with aluminum coating.

Secure it with roofing nails and then apply the torch down. Priming the underlayment is not needed. 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.

This membrane contains a core of nonwoven polyester mat that resists splits and tears.