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Walt, I do remember seeing a website a few months ago where someone had used red Styrofoam to make a stone viaduct. They had scribed a stone effect into it (using a soldering iron - if I remember correctly) and then painted it. The comment they made was that it had not lasted as well as they hopped, and the red colour from the foam was leeching though the paint. Now I don’t really know anything about Styrofoam you have over there, but if it is any thing like the styrofoam drinking cups we have here, there is no way I would be leaving that outside as a top layer, painted or not. By the time you have covered it with cement board, haven't you lost the best property, that you can easily carve it? If it was me, I would be trying to carve extra wide and deep slots, and then put a thin cement slurry over the top and see if you can still see the stone pattern. I am not sure how well concrete will stick to it, but you can get paints that you can apply to surfaces that help cement to stick to it. With a concrete surface you know it will last outside. Do you guys have light-weight or airated concrete? It's like a concrete building block that they pump air into, so it's got thousands of little air bubbles in it, so it is really light, and easy to carve. It's called Hebel concrete in Australia, and now it's just come to NZ. It's briliant stuff to carve stone walls out of, and because it is real concrete it lasts outside. Glen.
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