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 surfaced with granules and is designed for torch down application by professional roofing contractors. Care must be taken to apply the overlay board correctly to prevent ponding which is when the roof is not level. This membrane contains a core of nonwoven polyester mat that resists splits and tears. 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. 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. More product details close tri ply app granular cap sheet 39 625 in. What type of underlayment should i use.

Torch down roofing is a type of roofing material that has been designed for low angle or flat roofs. Modified bitumen roofing may have a granular surface as shown here or it may be smooth. As long as it is installed correctly bitumen prevents moisture build up without needing constant maintenance. 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. Secure it with roofing nails and then apply the torch down. If you install the smooth product cover it with aluminum coating. The roofing professional will lay down an overlay board or cover board next to support the torch down roofing membrane.

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. Torch down roofing consists of modified bitumen which is similar to asphalt. Use flashings approved by your building department. It is best to use 75 glass base underlayment.

This underlayment helps prevent the roof from developing condensation or moisture issues. Gafglas 75 base sheet for built up roofing bur is a premium roofing sheet with a strong fiberglass mat to prevent asphalt bleed through.