Hello All,

Going to install 1×12 ship lap siding on a tiny home in Hunter NY.  It is a 200sf box with 12/12 gable roof and no overhangs.  Would like to install the siding vertically and plan to use corrugated signboard strips (same idea as cora-vent SV-3)  installed horizontally to act as the rainscreen.  Walls are insulated already with 2lb spray foam and  sheathed with Zip sheathing and tape but has sat out the winter exposed and we feel it best to cover with a new Weather Resistive Barrier (WRB) like Tyvek or similar.

A couple of questions:

Suggestion on building wrap type overtop of Zip sheathing?  Perhaps simple layer of #15lb tar paper – something with high permeablility so as not to conflict with Zip sheathing?

What sort of fasteners should we use as they end up being exposed.  We are thinking of using 2.5″ exterior torx deck screws.  Nailing would be much faster  – what nails if we go that route?

The pine boards at 11.5″ wide, I am concerned about expansion/contraction/ cupping.  Across the width of the board do we fasten it just once to allow it to move or 2-3 times to restrain it from cupping?

I prefer installing it horizontally to shed water better but may prefer vertical –

Appreciate any advice on the above or anything else regarding installation and fastening suggestions.  Thanks in advance