temperature (approximately 330°F [166°C]). The flame should be moved from side to side and the membrane slowly unrolled while pressing the heated portion of the roll into the underlying surface. Apply the heat across the full width of the roll and along the 4" (102 mm) side lap area of the previously installed roll making an "L" shape. As the surface of the roll is heated, it will develop a sheen. The generation of smoke is an indication that the material is being overheated. Repeat the operation with subsequent rolls, while maintaining a 4" (102 mm) side lap and a 6" (152 mm) end lap. On mineral-surfaced membranes, prior to seaming the 6" (152 mm) end lap, the granules must be embedded by heating the end lap area and then pressing the granules into the compound using a rounded point trowel or an embedding tool. All laps should be rolled with a lap roller and a 1/8" (3 mm) to 3/8" (10 mm) bleed out of APP compound should extend beyond the lap. Check all laps for proper adhesion.

Caution: Never adhere APP products with hot asphalt.

7B.8 Cold Adhesive Application

7B.8.1 There are situations where the use of heat welding and hot asphalt are undesirable or prohibited. In such cases, it may be necessary to use alternative materials such as cold adhesives (typically referred to as "cold process cements" or "cold application cements/adhesives"). JM Research and Development staff has determined that traditional cut-back asphalt mastics, as well as some of the newer "modified bitumen adhesives", can have an adverse effect on APP and Classic modified bitumen products. This is due to the very high levels of solvent used in most of these cements. Softening, blisters and excessive granule loss can occur as the solvent from the cement passes through the membrane. This can cause accelerated aging of the underlying waterproofing with the potential for premature membrane failure.

7B.8.2 Through the evaluation of numerous alternate adhesive systems, JM has developed a viable cold application system for use with APP and PAO modified bitumen products.

7B.9 Health and Safety

7B.9.1 JM develops and maintains Material Safety Data Sheets (MSDS) for all of its products. These MSDS contain health and safety information for development of appropriate product handling procedures to protect the users of our products. These sheets are available from the Product Information Center (1-800-654-3103), FAX Express (1-888-329-3977), or on the JM website (www.jm. com). They should be read and understood by all involved personnel prior to using and handling JM materials. In addition to the MSDS, JM products have health and safety precautions printed on the product label or packaging. The user is strongly urged to familiarize himself with this information prior to using the product, and observe certain precautions during use.

7B.10 One-Part Cold Adhesive Application

7B.10.1 MBR Cold Application Adhesive and MBR Utility Cement are similar in consistency and application to traditional built-up roofing cold process cements. These adhesives form a durable, elastomeric, and waterproof layer once cured.

7B.10.2 MBR Cold Application Adhesive is for use in the field of the roof and is used to adhere roofing plies, modified bitumen sheets, and roof insulation. Fiber glass ply sheets, such as GlasPly Premier and GlasPly IV cannot be used with this material. The adhesive is ready to use as shipped and does not require mixing. Do not thin with additional solvents. The adhesive can be installed in temperatures between 40°F and 100°F (4°C and 38°C). However, when the temperature is below 50°F (10°C), the adhesive must be stored in a warm area (approximately 70°F [21°C]), for 24 hours before being used, to facilitate spreading. Note: Temperature affects the cure rate of the adhesive. Even in cooler weather, the product will develop bond strengths comparable to fully adhered single ply systems in a relatively short time. The membrane ultimately will develop adhesive bonds that exceed those of systems using asphalt as the adhesive.

7B.10.3 The adhesive is applied at a nominal rate of 1 1/2 gallons per square (0.61 liters/m² ) over non-porous substrates, e.g., primed concrete or fiber glass base felts. If applied to porous materials, such as insulations, the application rate will increase to over 2 gallons per square (0.82 liters/m² ), depending on the absorbency of the material.

7B.10.4 Position several rolls, beginning at the low edge of the work area, and unroll completely. Once the material has had time to relax, reroll the material from both ends (scroll) prior to applying the MBR Cold Application Adhesive.

7B.10.5 The simplest means of adhesive application is by pouring a 2" to 4" (51 mm - 102 mm) wide bead of the adhesive along the substrate, about 12" (305 mm) from the lower edge of the work area. The adhesive is spread with a 1/4 " (6 mm) (max.) saw toothed rubber squeegee to obtain a uniform bed of adhesive. (The Roofer-Rite Brand squeegee has been found to work very well for these applications.) Spread the adhesive first toward the lower edge of the work area. Then, continue to spread the adhesive up the roof until the bed of adhesive is wide enough to receive several sheets.

7B.10.6 The sheet is then rolled into the adhesive. It must be firmly and uniformly set, without voids, into the adhesive. Care must be taken not to contaminate the side and end laps with adhesive as the rolls are installed. The side and end laps are then heat welded.

Note: On mineral-surfaced sheets, the granules must be embedded at the end laps prior to heat welding.

7B.10.7 Continuing along the roof, the adhesive for the subsequent sheets is installed in the same manner.

7B.10.8 For the top layer of the membrane, adhesive is spread along the roof in the same manner used for the base ply. After the cap sheet has been placed into the bed of adhesive and aligned properly with the adjoining sheet, the side and end lap seams are heat welded. Roll the laps pressing a 1/8" (3 mm) bead of bitumen out of the lap. All laps must be checked for proper adhesion.

7B.11 One-Part Cold Adhesive Membrane Specifications

7B.11.1 Refer to Specification (Spec ID)-C1 for membrane construction recommendations.