I know that soft stucture Tyvek 1443R will hold a Polyurethane coating, such as Aquaseal Polycoat. I have never tried coating hard structure Housewrap.
Tyvek 1443R is by nature water repellant, but when lightly painted with Polycoat it is waterproof & weighs appox 1.4 oz per sq yard. I have used this on bivy bottoms & booties. The coating has held up for over six years of occasional use. However, Tyvek 1443R is fairly fragile, even when coated. I am quite careful in selecting my campsites, but I would not recomend Tyvek 1443R, even coated, for the use you listed at the begining of this thread.
I would suggest considering 70D Silnylon. It weighs appox 2.3 oz per sq yard, but is tough, waterproof & seems to me to be not as slick as the lighter 30D silnylon. BearPaw Wilderness Designs has 70D Sinylon.
Searching out the most level campsite available makes silnylon floors not much of a problem, imho.