Sealants, as the name applies, are used to stick materials together and also to block airflow. All caulking (a sealant to seal joints or seams against leakage) materials must have at least a minimum of 20 years of life expectancy before use. Acceptable sealants include (but not limited to): 

  1. Foam sealants that meet ICC ES 377 and ASTM C1642-07 such as: 
    1. 1-part urethane foam, low CFC (e.g. Great stuff, Pur-fil, Insta-foam, or equivalent). 
    2.  1-part urethane fire-block foam rated for sealing gaps in wood fire blocking. 
    3.  2-part urethane foam kits 1.75pcf density, 2-part Flame Spread 25 foam kits 1.75pcf. 
  2. Siliconized latex sealants meeting ASTM C834, 
  3. Silicone, 1-part gun grade urethane, and other elastomeric sealants meeting ASTMC 920, (“Silicone” refers to 100% silicone caulk, clear or pigmented—not acrylic) 
  4. Water-based duct sealant meeting UL 181A-M, UL 181B-M (“RCD #6” or equivalent) 
  5. Sealants rated for contact with chimneys and combustion vents such as: 
    1.  Non-combustible fire barrier caulk or furnace cement meeting ASTM E 136. 
    2.  Silicone high temp RTV listed for use on gas vents to 500 degrees F, meeting ASTM C920.

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