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[quote]QUOTE: Originally posted by uptowntrain Question for Joe, Can foam be placed directly on L girders. I am thinking of 1 X 4 pine. How many girders for a 2 X 4' section of foam 2" thick? [/quote] No, you'd need to use at least a 1/4" piece of plywood as a base for the fom. As for the girders, there's usually two of them per stretch -- they're really just the support for the joists and risers that actually hold the sub-roadbed. Some folks have had success with just 2" foam and metal joists (see some previous messages), but personally I'd worry about long-term sagging if there weren't some kind of periodic supports under the foam & plywood combination.
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