In the planning stage of redoing my layout, I'm not convinced I have enough room/need for topography on my small "U-shaped" layout (30.33 sq. ft.) after track, roads, structures, and scenery are put down, but I haven't ruled out the possibility of using foam board for topography just yet. Before I completely start over on my layout, I have a few questions about foam board. (BTW, I've never used foam board on a layout.) 1. Please share what you think about this technique. https://www.youtube.com/watch?v=aTK8Y_6aLZE The uploader says it won't work on pink insulation but it looks great with white insulation and it seems easy enough to do... with adequate ventilation, of course. 2. What are the pros and cons of pink insulation? 3. What are the pros and cons of white insulation? It seems most MRRers use pink foam insulation rather than white. Is there a good reason?