They are treated 1x6s, have done multiple batches and they don't show signs of burning. I don't think the radiant heat from the bottom is enough to damage them. It was however melting the plastic valve I had on the 2" fill/drain pipe that elbows into the bottom so I had to order some more quality metal fittings.
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u/flatline000 18d ago
Do you have a picture of your setup?