Imagine the largest gift you ever wrapped for Christmas, like a big screen TV or a bicycle. Now imagine a gift the size of a one and a half story building. Imagine wrapping it in a wind storm. That’s what it feels like to Tyvek-wrap a tiny house!
Tyvek or other house wrap (like old-school tar paper or roofing felt) is a necessary moisture barrier that prevents liquid water from penetrating in the plywood/insulation, but allows water vapor to escape out. You wrap from the bottom up in overlapping courses which you affix with roofing nails or staples and then tape the seams. You have to cut around bumps and protrusions like the wheel wells and the roof beam.
My dad, Brooke and I got suckered into a false sense of superiority by an easy first day where we got the first four courses up and taped. All that was left were the thin triangular top bits on the long sides and closing in the wheel wells – how hard could that be? Very hard actually. I’m sure that the installation instructions mention somewhere not to wrap on a windy day and sure enough yesterday got very breezy, so it took all day to finish the last parts. At times I felt like Christo!