Don’t know about that Linas, this is all I found.
Can DuPont™ Tyvek® be used with the lettering facing in?
DuPont™ Tyvek® HomeWrap®, DuPont™ Tyvek® StuccoWrap®, DuPont™ Tyvek® DrainWrap™ and DuPont™ Tyvek® CommercialWrap® are equally effective in both directions. However, DuPont™ Tyvek® StuccoWrap® and DuPont™ Tyvek® DrainWrap™
have a specially engineered surface that should be placed with the grooves in a vertical direction.
Why should I tape seams in the DuPont™ Tyvek®?
Taping the seams with DuPont™ Tyvek® Tape gives you the best Tyvek® to Tyvek® adhesion, optimal protection against air and bulk water penetration, and extra durability protection during the building’s construction phase.
What type of fasteners is recommended when installing DuPont™ Tyvek®?
DuPont™ Tyvek® can be installed using a variety of fasteners depending on the application. To attach DuPont™ Tyvek® to wood, insulated sheathing board or exterior gypsum board, use nails with plastic washer heads, such as DuPont™ Tyvek® Wrap Caps. You may choose to use wide staples with a minimum 1” crown. For steel frame construction use DuPont™ Tyvek® Wrap Cap Screws.
All I know is that it is not any harder to install it with the lettering right side up.
Maybe it is because they can not read.