House wrap under vinyl siding?

[Firebrick43]

I have never seen a single residential contractor install tyvek properly.

They use staples which are not an approved application method.

Should be installed with screws and plates, all which should be taped to seal.

Not really sure why you are replying to my post?

The failures I am talking about are two fold.

One is the pores plugging up with dirt over time. This forms a double vapor barrier and moisture can't escape the wall causing OSB and insulation to become saturated over time.

The second part of the failure is related to the paint or coating on wood and hardieplank siding. Water that gets behind the siding can't evaporated/dry quickly and is absorbed by the wood or fiber cement. The wood expands some in all weather and both wood and fiber cement expand greatly when moist and freezes. This causes pealing paint, cracked/split wood, and delamination Of fiber cement.

As far as tyvek installation goes, yes many use just a stapler which is incorrect. However cap screws is not the only approved method, cap nails, and cap staples are also approved. The two tyvek failure I have witnessed were cap nailed correctly.

 

[bob15]

Tar Paper and different building materials.

Tar paper yes....the rest of the material are the same: wood and aluminum siding.

Tyvek isn't the all-promised material and the end-all need to have it or the building will collapse if it isn't used type of material.