[schmism]

a Tyvek type house wrap serves to pourpouses.

1) mousture barier
2) wind barier

In the north the mosture barier usually goes on the inside due to more time spent heating the house with warm most air inside... (not trapped in the insulation)

in the shouth it usually goes on the outside as your cooling more, (keeping the warm moist air OUTSIDE, and again, out of the insulation.

no such thing as a "to tight of a house" you just need proper air to air exhanger thats all.