You are so right, Winds. I did it for my ground cloth and worked out great.
I found the video (below) kilt making and the lady says she uses 8 YARDS of fabric. Thinking I may need to hit the laundry mat to wash THAT much Tyvek. Lol.
http://www.google.com/url?sa=t&rct=j...G-mXCnE4zLU6aQ