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I think you need to do a bit more research on this material. It is WAY more sealing than regular concrete and is not that expensive. In fact the cost saved in unnecessary construction is enough to null the extra expense in material. This has been used in Europe for 70 years.
Read all about it. THEN bag on it!
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"Influences are alarm clocks of talents you already have within you."- Juana Molina
"Don't play everything. Let some things go by. Some music is just imagined" - Thelonius Monk
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