To whom it may concern, I am general contractor in the Fernandina Beach area of Florida. We are intrested in the ICF forms and presantly seating the specks for our own design of homes called "Storm Homes". Is there a recomended concrete additive that can be added to prevent cracking when using ICF forms for the roof or do you think that the only way to do this is with control lines. I would like very much to here your response on this for our upcoming county shelters and homes. Thank you Judy Gibson Phone 904-225-2280