I installed 9-foot wide Tyvek "Home Wrap" over OSB sheeting on the ends of a new barn that I am constructing. There are several openings framed for windows and I wrapped the Tyvek around the openings as recommended by the installation instructions. I am now ready to install windows and the manufacturer (WindowMaster)specifies in their installation instructions to lap the sill flashing over the house wrap (this is at the bottom, and lap the house wrap over the jamb (sides) and top flashing. They indicate in the instructions that this is accomplished by using short lengths of house wrap. How would you proceed at this point?