Torch Down Roofing Underlayment

The mat is coated with durable app modified bitumen and is designed for torch down application by professional roofing.

Torch down roofing underlayment.

It is best to use 75 glass base underlayment. Secure it with roofing nails and then apply the torch down. 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.

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. Torch down roofing consists of modified bitumen which is similar to asphalt. 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.

I originally was going to use ice and water shield but don t think i want to put torch down on top of that. 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. As long as it is installed correctly bitumen prevents moisture build up without needing constant maintenance.

This underlayment helps prevent the roof from developing condensation or moisture issues. Torch down roofing is a type of roofing material that has been designed for low angle or flat roofs. 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. Priming the underlayment is not needed.

I m going to be re roofing an addition on our house that is low slop and would like to use torchdown roofing. 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. Renting a large propane torch is. If you install the smooth product cover it with aluminum coating.

These steps show a torch down method which looks a bit scary but actually is not too difficult.