Safe woods

I am a bit confused about safe woods for reptiles.

They say no cedar or pine (pine is debated, hi Skip.) because they are "evergreens". But Cypress is an evergreen and people use cypress mulch?

I am not looking about substrate. I am talking about to build enclosures with. In this part of the world, they sell ready made enclosures made with "Chinese fir", and I looked up fir is safe, but then found out that "Chinese fir" isn't a fir! It's just a nickname for an evergreen in the cypress family.

I think the best answer to your question is going to be the simple fact that any enclosure that is made out of wood will have to be sealed on the inside to prevent these inevitable humidity from rotting it, and once it is sealed the type of wood really doesn't matter. I have made several enclosures entirely out of pine plywood, and have no issues because they get a coating of sealant.

I just built my terrarium stand out of pine. Not worried about it in the slightest. Because all of the wood is going to be sealed to prevent water damage.

You wouldn't build with cedar though, right?

If it was just the stand? I wouldn't mind. But pine is the cheapest of the woods used for building.