Is untreated pine 2x4s safe material?

[cmsreptiles]

I’ll go ahead and link you this response from a post I had made to explain why its not done often…

Wanting to try a DIY build

There are many drawbacks to that cheaper option of wood: It’s heavy. It can warp in high humidity. It’s organic so it’ll degrade over time. It’s porous, so you have to be careful of direct contact with water. It may require sealing (and resealing). So, yeah, the material is initially, monetarily cheaper, but you’ll pay for it in other ways. For instance, if you have to get hurricane protection for your house windows, you could DIY on the cheap with removable sheets of plywood or spend the ex…

@south_saturn_delta

but don’t trust running heat tape over expanded pvc,

Also why is this?