Hi, I live on the Gulf Coast of Florida and was wondering what insulation to use behind EnduraFlood, I want something that won’t absorb water and still be fire resistant, I was going to use closed cell ridged foam boards with a 15 minute thermal barrier so I can just take it out clean and dry it after next flood, but the foam boards even with a thermal barrier still concerns me because they are highly combustible, is there a better way to insulate block walls?