I read some reviews and folks say its pretty efficient, meaning it seals pretty good, if not I can glue some of the heat proof rope door seal like the big ones have......... and I would have to put cement board under and on two walls with air space behind them..........

Realist - Everybody in America is soft, and hates conflict. The cure for this, both in politics and social life, is the same -- hardihood. Give them raw truth.