No, DensGlass is not meant to be used as a permanently exposed external board. However, during construction it can be left exposed for up to twelve months with all joints treated with either RCM Tape or FR PRO Sealant. However, if the joints are taped as soon as the boards are fitted they can be left exposed during the construction phase for up to 3 months, for up to 12 months temporary exposure we highly recommend using the RCM Joint Seal Kit.
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