Word to mean "capable of being walked on by having the strength to support the weight of humans"

I am wondering if a word exists that means that something is capable of being walked on by humans under normal expected load. For example, a roof you know that is strong enough to support normal amount of men working on it with no concerns. Say the word is "pattible". You would use it as;

"The roof is pattible, go on up" "After the storm, I think the roof is inpattible, be careful" "The ice is only pattible between November and February" "Adding a column underneath really helped the pattibility of the bay window"

I will go so far as to say there isn't such a word: I've searched OED for support and weight and not found any relevant definitions. English tends not to have single words for complex concepts.

However, one adjective which does fit is safe.

The roof is safe, go on up
After the storm, I think the roof is unsafe: be careful
The ice is only safe between November and February

A crowdsourced dictionary I've been able to find has "walkable" which sounds a little odd to me (would be perfectly correct if it were German, "begehbar" which is almost a technical term) https://www.dict.cc/englisch-deutsch/walkable.html

Otherwise, how about "safe to stand/walk on [for a single person, for a working team, etc]". Not a single word though.