SBS Modified Bitumen - Page 8

7A.23.3 Using clean solvent, wipe down the pump. Push the lower ball valve up and look at the ball to see that it and the cage (the area in which the ball moves) are properly cleaned. Wipe off thoroughly before placing the pump in the clean solvent. Hold the gun over the waste solvent pail and pump clean solvent until clean solvent comes out of the gun. Then clean the gun, hose and pump thoroughly once more with the clean solvent. For trouble-free spraying with this material, it is essential to do a thorough cleaning job.

7A.23.4 For equipment other than that described in these instructions, similar procedures will be required. Contact the equipment manufacturer for recommendations on what additional or different instructions are required for their particular piece of equipment.

7A.24 Two-Part Adhesive Disposal Information

7A.24.1 MBR Bonding Cement Base that has been fully reacted with MBR Cement Activator can usually be disposed of at a licensed landfill.

7A.24.2 MBR Bonding Cement Base is considered a hazardous waste. Disposal must be in accordance with local, state, and federal regulations. If possible, react any remaining material with MBR Cement Activator. The resulting waste can usually be disposed of at a licensed landfill.

7A.24.3 MBR Cement Activator is also considered a hazardous waste. Disposal must be in accordance with local, state, and federal regulations. If the material is reacted with one of the MBR Cement Bases, disposal can be as recommended for MBR Bonding Cement. If this is not the case, the material can be neutralized using a 90% water, 8% ammonia and 2% detergent solution. Containers must be left open for at least 48 hours to allow any CO₂ gas evolved to escape. The resulting solidified waste can then usually be disposed of at a licensed landfill.

7A.25 Two-Part Adhesive Empty Containers

7A.25.1 MBR Bonding Cement Base containers, when "empty", contain combustible and harmful vapors and residue. Do not reuse the container or remove the labels. Follow all of the label warnings even when the container is empty. Disposal of the container shall be in accordance with applicable regulations. If the residue is of fully reacted material, the container can usually be disposed of at a licensed landfill.

7A.25.2 MBR Cement Activator containers shall be neutralized with the solution described in the disposal portion of this section. Decontaminated containers must be left open for at least 48 hours to allow any CO₂ gas evolved to escape. Containers can then be disposed of at a licensed landfill.

7A.26 Two-Part Cold Adhesive Membrane Specifications

7A.26.1 Refer to specification (Spec ID)-C2, squeegee or spray for membrane construction recommendations.

7A.27 One-Part Cold Adhesive Application

7A.27.1 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.

7A.27.2 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.

7A.27.3 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.

7A.27.4 The simplest method of adhesive application is by pouring a 2" to 4" (51 to 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. Spread the adhesive first toward the lower edge of the work area, or to the appropriate laying line of the adjoining felt, creating a uniform coating of adhesive. Continue to spread the adhesive up the roof until the bed of adhesive is wide enough to receive the sheet.

7A.27.5 The sheet is then rolled, scrolled, or flopped into the adhesive. It must be firmly and uniformly set, without voids, into the adhesive. Brooming and scuffing the laps are recommended to assure embedment. Repositioning or straightening of the sheet can be accomplished while it is being laid out.

7A.27.6 Continuing along the roof, the adhesive for the subsequent sheets is installed in the same manner. It is also applied over the last 4" (102 mm) (minimum) of the preceding sheet, to form an end lap (6" [152 mm] for DynaLastic 180, DynaLastic 180 FR, DynaLastic 180 S, DynaLastic 250 and DynaLastic 250 FR). Subsequent courses are applied in the same manner as before, with the adhesive being spread onto the lower course to accommodate the appropriate felt lay-up.