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What is the best type for a layout base? I have seen messages describing that a layou should be built using the follwoing materials from bottom to top: plywood, then foam insulation, then cork roadbed, and then track. What is the purpose of the foam insulaton board and what is the best type? Is there any type to avoid? Also, any links to your pictures of construction progress using foam insulation board is appraciated. Thanks.
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