To retard soil gas entry, all control joints, isolation joints, construction joints and any other joints in concrete slabls or between slabs and foundation walls shall be sealed.  A continuous formed gap (for example, a tooled edge) which allows the application of a sealant that will provide a continuous, air-tight seal shall be created along all joints.  When the slab has cured, the gap shall be cleared of loose material and filled with an elastomeric joint sealant, as defined in ASTM C920-97, and applied in accordance with the manufacturer’s recommendations.
	Channel type (French) drains are not recommended.  However, if used, such drains shall be sealed with backer-rod and an elastomeric joint sealant in a manner that retains the channel feature and does not interfere with the effectiveness of the drain as a water control system.
	Floor drains and air conditioning condensate drains that discharge directly into the soil below the slab or into crawlspaces should be avoided.  If installed, these drains shall be routed through solid pipe to daylight or through a trap approved for use in floor drains by local plumbing codes.