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Gas Tight Seal

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I am putting a concrete roof on an existing wastewater digester. I am using
a center column for the roof and am simply resting the slab edge on the top
of the esisting wall on a bearing pad. 

I am concerned with gas escaping. Do I need to provide any type of gas
tight seal or is the weight of the 18 inch roof slab enough.Has anyone
encountered this situation?

Randy Russ, P.E.