Mmmmm... If it is invasive, then I dispute that what you've got is a nursery variety of parthenocissus tricuspidata. That is my favorite reason to use the European common name of "virgin vine" rather than "Boston ivy". In the US there is too much confusion in common identification of landscape ivies.
This was the best I could find as far as the tap root topic, though I am still looking.
About 60 percent of grapevine roots sit in the top 24 inches of soil...some can grow more 20 feet deep...some studies suggest that the roots can spread as far as 33 feet.
Will dispute the claim of invasiveness until I see an example for myself.
The quinquefolia is less vigorous and not able to cover such a large wall area as the tricuspidata.
Lots of desirable plants come from Asia. Using parthenocissus tricuspidata for wall greening is a traditional practice which I'll argue needs to be re-invigorated, IMHO.
Michael Longfield wrote:... the german site says "Boston Ivy can cause significant damage to buildings!... their stem girth, can blast apart building elements, block roller-shutter boxes and lift roof shingles. Insufficient removal of foliage may also block roof gutters. A frequently asked question during the restoration of a façade is how to deal with the remaining adhesive roots of torn-off plants: the only solution is to burn them off / torch them and then repaint the wall!"
I don't think its fair that Jay threw out the "that's not permaculture" card.