After some years of experimentation, European scientists introduced the modified bitumen roofing material to the commercial market in the 1960s. All rights reserved. By using this website you accept our use of cookies and the, the top of the membrane to add fire resistance, Ways to Make Your Next Commercial Roof Replacement Less Distracting for Building Tenants. Torch down roofing (sometimes referred to as “torch on” roofing) is so named because it requires an open-flame propane torch. SBS modified bitumen roofing membranes can be installed by torch application, but are also self-adhered, cold-processed, or applied with a mop. While some would cite the modified bitumen roofing system's cost as a disadvantage, a closer inspection of the cost factors and benefits often shows the modified bitumen roofing system may be the better buy in the long-term. Shown to withstand delamination, deterioration, warping, and jobsite damage more effectively than other roofing membrane substrates such as paper-faced gypsum board, fiber board, and perlite insulation.

Safety training has reduced the occurrence of these accidents significantly. Owens Corning produces high quality asphalt coating, asphalt sealants and adhesives for asphalt shingles Reasons for the disparity in costs include the availability of raw materials and manufacturing infrastructure. Further, the membranes are limited to a maximum width of one meter, which creates multiple seams for the roofing professional to fasten together. For those who want a more durable, lower-maintenance roofing option, the modified bitumen roofing system is quickly becoming the most popular alternative for flat or low-sloping roofs. Both systems have a base and cap sheet, but in the three-layer system, the roofing professional will apply a base sheet, then a smooth cap sheet, and finish with a granule cap sheet. Therefore, it is strongly recommended that torch down roofing systems are installed in dry conditions. Torch down roofing is applied with a torch rather than a hot mop, and this system eliminates the unpleasant odor of hot mop procedures. The modified bitumen roofing system consists of six foundational elements. The insulation layer provides its R value, or thermal resistance, that limits the movement of heat passing between the roofing structure.

A mat of fiberglass, polyester, or other material is often used as a sturdy core for torch down roofing membranes.

This limits its application for use on non-factory roofs. Similar to tar and gravel roofing, the torch down roof consists of layers of fiberglass and polyester with bitumen that are added to the regular tar and gravel layering system. To correct this issue, the bubbles must be cut out and the area repaired with patch-sheeting material. After placing down base and felt layers, the roofing professionals pour liquid asphalt onto the roof and use a mop to spread it out. Water-resistant torch down roofing is an excellent choice in snowy environments. The residential market for modified bitumen roofing materials is still not mature, and most of the big box home improvement stores do not yet carry the roofing materials. A: R value is a measurement signifying a material’s resistance to heat transfer. This applies to those who are doing a complete roofing re-install. Copyright © ImproveNetAll Rights Reserved. The asphalt then seals, creating a thick, waterproof and durable rooftop. APP torch down roofing membranes are flexible and respond well to both heating and cooling. Roof replacements shall comply with Section C402.1.3, C402.1.4, C402.1.5 or C407 where the existing roof assembly is part of the building thermal envelope and contains insulation entirely above the roof deck. Also called modified bitumen, due to the mixing of asphalt with rubber compounds, torch down roofing provides additional strength and resistance to a flat or low sloped roof. A three-layer system is less likely to suffer from these issues, and if problems occur, repair is simple. For example, modified bitumen roofing solutions cost more than traditional asphalt roofing options, but it is well-known for its strength. However, this width also has an advantage, as these rolls are easy to transport to restricted sites where bulkier systems cannot be used. It is not, however, suited to areas prone to high rainfall or snowfall, and has an average life expectancy of about 15 years.

Because of its initial cost and material properties, the modified bitumen roofing system was almost exclusively used for commercial and industrial roofing applications. A torch down roofing system is best for slightly pitched roofs, between ¼: 12 to 1: 12 pitch, where your goals are to have a durable and long-lasting roof that stands up well to the elements, especially snow. These materials are usually not readily available at the local hardware stores. Modified bitumen roofing systems present real estate owners significant advantages for both commercial and residential applications.

Surfacing is a compound that is applied either manually or via the manufacturing process to protect the roof against undue wear from ultraviolet light. One of the main reasons for the long life of the modified bitumen roofing system is its strength; there are several types of modified bitumen roofing systems that use various polymer mixtures. Bitumen is made from asphalt, a tough material that is used in many roofing applications. The main strength of this type of roofing is that it can expand and contract without melting or cracking. A hot mopped roof gets its name from its method of installation. Do-it-yourself roofing installations could save homeowners money. Usually, hot mopped is less expensive to install than torch down. We usually use 1 1/2" ISO board. This type of roofing system is what we recommend for any flat roof. ... Not sure on the R value of typical roof insulations. Although these organizations mostly deal with licensed contractors and provide them with discounts, they give price quotes and may sell the modified bitumen roofing products to the public.

Torch down roofing consists of modified bitumen, which is similar to asphalt. Torch down roofing is applied with a torch rather than a hot mop, and this system eliminates the unpleasant odor of hot mop procedures. Painting Reflective Paint on Flat, Rubber Torch Down Roof My Wife and I bought our home a year ago and it has an 11 year old flat roof, which according to the invoice of the work done is Rubberized Torchdown material that had a non-fibered aluminum roof coating applied over it. What’s the difference? The first job of any roof system is to keep water out of the building/structure, and torch down roofing has excellent water-resistant properties.

Get free estimates from local Roofing contractors. A material with a high R Value has a high resistance to heat transfer. Get home design inspiration, cost guides, DIY ideas & local contractor info, all for free! The adhesive serves to attach the roofing material to the existing building infrastructure and gives it water resistance for protection against the elements. Historically these products have been torch-applied, mop-applied using hot asphalt (SBS only), or applied with solvent-based adhesives. These extra sheets are torched down in the overlap areas during the installation process, using large flame throwing torches that melt the asphalt at the seams to join them together, which is the origin of the name “torch down roofing”. When both commercial and residential real estate owners consider significant purchases such as a new roof, they often do a simple cost-benefit analysis of their available alternatives. Instructional materials are available for do-it-yourself roof installers who decide to use the self-adhesive version of the modified bitumen roofing sheets.

However, national markets may indicate costs that are up to three-times higher than those of the international market. R value of a Dura-Foam roof is measured by using the conservative factor of R 6.25 per inch of polyurethane foam. Climates with frequent snow are a challenge for flat roofs because snow stays on the roof until it melts. Trade: Roofing and Gutter Specialist. The membrane layers of a torch down roof are made of an asphalt compound called bitumen that is modified with either rubber or plastic.

Although modified bitumen roofing systems are known for their fantastic waterproofing properties, sometimes moisture can get under the bitumen membranes and base sheets to form bubbles. The blend of synthetic rubberized polymers with asphalt makes torch down roofing extremely flexible. Some building owners can opt to invest in a professional installation that involves hot processing and guaranteed work. Building owners may find themselves choosing between a torch down and hot mopped roof, also called Built Up Roofing (BUR). Experience the total Owens Corning Roofing System and high quality roofing shingles. The base sheets build up the layers of modified bitumen for added durability and strength. ... R-Values.28 [Tested in accordance with ASTM C518] Spannings: 1/4" - spans flute widths up to 2 5/8" Flexural Strengths, Parallel, lbs. A torch down roof is also significantly more attractive than a standard tar and gravel roof.

One such advantage is its longevity.

One disadvantage of the modified bitumen roofing system is that it is only recommended for low-sloping roofs or flat roofs. This extra layer helps extend the life of the roof and usually enhances fire resistance, energy efficiency, color, or other features. For example, the average cost quotes reflect the rates found on the international market. Many traditional asphalt roofing systems experience problems after a 10- to 15-year period, but modified bitumen roofing systems are known to last over 20 years without a lot of maintenance issues. Today, self-adhering modified bitumen sheets are also available, which allows roofers to patch up any gaps or leaks without the dangerous and costly use of torches. There are different types of torch down roofing including two-layer and three-layer systems. A roofing torch requires the use of a gas torch with an open flame operating at extremely high temperatures and runs the risk of fire and burning the roofing professional. This roofing system consists of layered bitumen membranes that are mixed with special polymers to give the roofing material properties akin to plastic or rubber. In addition to the cost of the modified bitumen roofing sheets, those who install the material must have a building permit in most regions. It also allows the torch down roof to be repaired more efficiently. Provided the membrane and insulation are installed according to manufacturer application instructions, the flat surface of a torch down roof prevents water from collecting and allows it to drain off.

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The final result is the vulcanization of a large rubber sheet onto a fiberglass base. Let Owens Corning help you determine when it is time for a new roof and then let us help you choose the shingles for your roof that are right for you.

If you’re wondering whether torch down roofing is the right choice for your flat roof, you can learn about the pros and cons of torch down roofing from this article. Patches of modified bitumen membrane may be added to the rip, gap, or broken seam.

If installed correctly this rubber roof will last 40 years and beyond with little maintenance. There are two main types of torch down roll roofing: two-layer systems and three-layer systems. IKO is dedicated to education about all things roofing. Installation.

If the roof is completely flat, torch-on roofing is not typically recommended. We can even help you find a professional to install it. The insulation layer provides its R value, or thermal resistance, that limits the movement of heat passing between the roofing … Manufacturers also may embed small granules into the top of the membrane to add fire resistance, color options, ultraviolet (UV) radiation protection, or other distinctive characteristics.

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