Materials in the subfloor moisture-resistant and rodent-proof

[Avemo]

What do you base this statement on? I know several blindbotten built with tongue-and-groove foam across the joists that have worked just fine

I’ll answer even though the question was directed at Kurtivan.

Foam encompasses both Styrofoam and regular white polystyrene. I have seen a blindbotten made of polystyrene that mice have gnawed through without any problem. Therefore, I advised against it because I thought the same would apply to Styrofoam. I’ll take Kurtivan's word that Styrofoam works, but I know polystyrene is not mouse-proof. Perhaps there weren't many mice in the foundation you saw.

Erik

 

[Haegermeister]

I will reply even though the question was addressed to Kurtivan.

Cellplast as a concept includes both styrofoam and regular white polystyrene foam. I have seen a blind bottom of polystyrene foam that mice have freely gnawed tunnels through. Therefore, I advised against it as I thought the same would apply to styrofoam. I have to trust Kurtivan's word that it works with styrofoam, but I know that polystyrene foam is not mouse-proof. Perhaps there weren't many mice in the foundation you saw.

Erik

Most likely there weren't many mice there, but in the rest of the house, there were some traces.

Maybe as a precaution, one can treat the cellplast with something the mice don't like? Whatever that might be...

But now we're constructing with cellplast in this case so that's how it will be.