Originally posted by: cubequeen
What would be heat resistant, hold up to steam and not leach any type of resins into the padding?
Some I would consider:
hard maple (used in butcher blocks and counter tops)
parawood (again, butcher blocks and counter tops)
olivewood (used in cooking utensils)
teak (known for moisture resistance but is oily)
bamboo (cooking utensils)
hickory (known for hardness and stability but would probably impart a hickory smoked smell)
cypress (although soft, it might stand up to a certain amount of steam/heat
Olivewood is expensive and I don't recall ever seeing it in lumber form, only turning/carving blanks but it is used for the best kitchen utensils - spoons, spatulas, etc, so it would stand up to heat and moisture.
I think my top 3 choices would be maple, parawood and bamboo though I don't know where you'd find a suitable bamboo in lumber form. You might try calling the folks here -
http://www.calibamboo.com/bamboopaneling.html and talking to them if bamboo is a real possibility in your mind.
Parawood (from the latex producing rubber tree) is used in a lot of kitchen items, including butcher blocks, cutting boards and counter tops. I have no idea where you might find stock to create something of that size however. You might try a google search. While I finish a lot of pieces made of parawood, I've never had a reason to build anything from it.
That would leave me with maple - probably laminated and cleated on the bottom.
It's easy to find in standard lumber widths, thicknesses and lengths, it's easy to mill, stands up to some pretty harsh use.
Thinking a bit more about this -- I wonder what people use in those home-use steam rooms. The ones I've seen have always been wood lined with wooden benches.
That might be something to research a bit.