Lots to talk about on this subject! Obviously there are pros and cons of each methods and nowadays the line has been blurred between the two. I've seen foam with rebar reinforcement used and spaced out from the foam with bits of block and such. I've also seen steel schedules shot and then foam thrown in and shot over for quick structural shape. At any rate, some of these methods are approved and others are not.. I can say from experience as a contractor that the steel and backing method is widely accepted across the USA. There are engineered drawing that show steel schedules for rockwork construction based on height, whether or not it will be retaining soil and what's required for longevity of a slide. Foam core I am not familiar with as I do not use this method as others do. It concerns me that a foam job can be done so quickly for large amounts of money literally over the weekend or several days. I'd like to see some foam drawings for rockwork construction submitted to the city where the build will take place and stamped by an engineer. Im interested in what everybody has to say about this topic of conversation. Please share your experiences for all to learn from. Thanks and Rock on!
