Torch Down Roofing Underlayment

Secure it with roofing nails and then apply the torch down.

Torch down roofing underlayment. 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. Care must be taken to apply the overlay board correctly to prevent ponding which is when the roof is not level. Gafglas 75 base sheet for built up roofing bur is a premium roofing sheet with a strong fiberglass mat to prevent asphalt bleed through. The mat is coated with durable app modified bitumen and is designed for torch down application by professional roofing.

Torch down roofing is a type of roofing material that has been designed for low angle or flat roofs. I originally was going to use ice and water shield but don t think i want to put torch down on top of that. It is best to use 75 glass base underlayment. Priming the underlayment is not needed.

This underlayment helps prevent the roof from developing condensation or moisture issues. 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. Use flashings approved by your building department.

The roofing professional will lay down an overlay board or cover board next to support the torch down roofing membrane. Modified bitumen roofing may have a granular surface as shown here or it may be smooth. This video shows you how to use a torch and also tar to make a repair on a modified bitumen rubber flat roof. Torch down roofing consists of modified bitumen which is similar to asphalt.

This membrane contains a core of nonwoven polyester mat that resists splits and tears. These steps show a torch down method which looks a bit scary but actually is not too difficult. What type of underlayment should i use. As long as it is installed correctly bitumen prevents moisture build up without needing constant maintenance.

The sealed sheet also serves as an effective flame retarder for the application of torch applied modified bitumen membranes.