SBS and PMMA
Waterproofing a Roof in Cold Weather
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General Guidelines
To facilitate the application of adhesive at ambient temperatures below 70°F (21°C), all materials such as resins, adhesive, and roll goods should be stored in a warm place such as a heated trailer or other climate-controlled storage area before use.
Bulk warmers, inline heaters, or other pre-heating equipment, such as thermostatically-controlled warming blankets, should be considered to maintain the proper temperature and viscosity of the adhesive products.
The use of “band heaters” should be avoided for safety reasons. When heating materials, always exercise caution and never leave the materials/equipment unattended.
Siplast adhesives should never be exposed to open flame for heating purposes. Care should be taken to ensure the adhesive does not exceed the flash point (flash point temperatures are listed on the Safety Data Sheets).
The adhesive application should be suspended when the adhesive cannot be applied at temperatures allowing for even distribution at proper application rates. "Fly” the pre-cut roofing sheets by placing them into the adhesive rather than rolling them into position. "Flying in" sheets is an effective, efficient technique that is equally appropriate in warmer weather.
Note: Refer to the PA-311 Adhesive(s) and SFT Adhesive product information sheets for application usage rates and monitor application to prevent over-application of adhesive.
Self-Adhesive Membrane Applications
When using Pro Base products with the Syntan Acrylic Coating, the Parapro Roof Membrane. System should be installed the same day as the Pro Base SA or Pro Base TS SA sheet.
Parapro Roof Membrane Resin, Parapro Flashing Resin and Terapro Base Resins are available in summer and winter grades. Summer grade resins may be applied when the ambient temperature is between 59°F (15°C) and 104°F (40°C) and the substrate temperature is between 59°F (15°C) and 122°F (50°C). Winter grade resin may be applied when the ambient temperature is between 23°F (-5°C) and 68°F (20°C) and the substrate temperature is between 23°F (-5°C) and 77°F (25°C).
Recommended ambient application temperatures for summer and winter grade material overlap from 59°F to 68°F. At ambient temperatures below 59°F, winter-grade resin should always be used. Paracoat, Pro Primer R, Pro Primer W, Pro Primer T, Pro Matrix Flashing Resin, Pro Color Finish Resin, and Pro Paste Resins are not produced in winter and summer grades. Please refer to the Parapro and Terapro Installer's Guides for specific details regarding application temperatures and catalyzation. Paracoat Roof Coating may be applied when the ambient temperature is between 32°F (0°C) and 95°F (35°C) and the substrate temperature is between 32°F (0°C) and 104°F (40°C).
Asphalt Applications
Special precautions must be taken to ensure that Type IV asphalt maintains a minimum acceptable 400°F (204°C) temperature at the point of sheet application. Asphalt must not be overheated to compensate for cold weather conditions.
The use of insulated handling equipment is strongly recommended. Hot luggers, mop carts, and kettle-to-roof supply lines should be insulated. Hand mops used in cool weather should be smaller than those used in the summer season to facilitate short mopping leads. Luggers and mop carts should be less than half-filled at all times.
During application, asphalt should never be applied more than 5 feet ahead of the roll, which should be unrolled continuously at a steady pace. The moppings should always be "squared off" between mopping intervals, and the roll should be rolled through the mopped areas and then be backrolled, exposing 2 to 3 inches of asphalt. This procedure eliminates excess asphalt build-up at roll "stops." Pressure should be kept on the roll throughout the installation to ensure proper embedment. Air pockets beneath the system or between plies are unacceptable. Any such pockets should be broomed in immediately while the asphalt is still hot. The use of a weighted roller on the laps is recommended.