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Torch Down Roofing with Modified Bitumen

Modified Bitumen (MB) Torch Down Roofing membranes were first developed in Europe in the mid-1960’s, introduced in the U.S. in the late 1970’s, and first manufactured in the U.S. in 1980.

The membrane is composed of various types of modifiers, reinforcements, and surface treatments.

The 36 inch-wide membrane comes with or without embedded ceramic granules that protect against harmful UV rays. The unprotected MB membrane needs an asphalt-aluminum coating, known as Silver Coating, for harmful UV protection.

Torch down roofing using MB installs as a single ply, or a two-ply membrane, on both commercial and residential buildings. When installed as a two-ply system, we provide a 40-year warranty.

Torch Down MB Over Surfaces

The 2 Ply MB Torch Down Roofing Membrane is 3/8″ thick and can be installed directly over an uneven stone surface without being compromised by punctures. In fact, the stone trapped between the membrane and the old roof provides excellent insulation.

It is possible and feasible to install MB over EPDM and TPO roofing systems that have degraded due to the lack of UV protection and the failures of bonding adhesives on seams.

Because these existing roofing systems can be covered with the 2 Ply MB, stripping and removing the current roof debris will not be an expense. 

Torching Down an MB Two Ply Membrane 

Torching down a Modified Bitumen 2 ply membrane requires little surface preparation. A 2 ply torch down membrane can be installed over any existing roof or surface, to include a Hot-Tar-and-Gravel roof system.

The first step is to install a fiber asphalt base fastened with anchors and washer plates, to the existing roof, or to a substrate.

The second is installing a self-adhering modified bitumen rubber base.

The third step is installing a Modified Bitumen membrane, embedded with ceramic granules, is heat fused down to the base, completing the two-ply system. The combination of these layers makes the membrane over 3/8″ thick.

This roof system can withstand heavy foot traffic by work crews, snow shoveling, and because it has embedded ceramic granules on the surface, will protect it from harmful UV rays.

MB Two-Ply Rubber Membrane with Fiber Base Sheet.

Torch Down Roofing for Commercial Rubber Roofs - 2 rubber membranes with a fiber base.

MB Two-Ply Rubber Membrane Thickness

Torch Down Roofing - This shows the thickness of a two ply system Modified Bitumen

Torch Down Roofing is Durable

Torch down two-ply rubber roofs are durable in that, not only can they withstand at least 40 years of extreme weather conditions, they can remain unaffected with heavy foot traffic by service and repairers, as well.

Unlike the single ply roofing systems, as in TPO and EPDM, the two-ply MB system will need little to no maintenance during its life.

Torch Down Roofing Materials

Installing the Torch Down Modified Bitumen 2 Ply Rubber Roofing requires a contractor to have the following:

  • Fiber base paper with anchors and plates
  • The Modified Bitumen self-adhesive base
  • A Modified Bitumen single-ply rubber membrane (known as a cap sheet) with embedded ceramic granules that protect against harmful UV rays
  • Professional, well-experienced roof technicians, that are skilled with installing MB roofs
Torching down roofing or heat fusing a Modified Bitumen Rubber Membrane

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