Carport gable details

A homeowner asked an online building forum how to properly finish the gable end of a carport attached to their garage. The carport is built from posts and beams supporting roof trusses that extend the garage roofline, and the owner plans to enclose the underside with corrugated steel to keep birds out. The question was whether the gable (the triangular wall section under the roof peak) needs a full wall assembly, or whether metal cladding alone would do.

An experienced forum member answered that a gable on a carport is normally built like any exterior wall: sheathing, then a water-resistive barrier (WRB, a layer that keeps rain out while letting moisture escape), then a rainscreen gap, and finally the cladding. But because a carport gable isn't enclosing conditioned living space, he said the homeowner could likely get away with just metal cladding directly over the trusses and still be fine. He added one practical reason to still use a taped WRB across both the gable and the underside of the carport: it helps seal out wasps and other pests looking for gaps to nest in.

For someone with a similar carport or open structure at home, the takeaway is that these secondary, unheated structures don't need the same rain and moisture protection as your house's walls. A simpler metal skin can work, though adding a sealed barrier underneath is a low-cost way to keep insects and birds from moving in.