Our club in Northern Cal did a petro mat. We stepped up for the 900.00 per 15' by 300 Ft rolls. We put down 8 rolls. With overlap it is about 55 foot wide and 600 long. The mistake we made was not putting a good base under it. We tilled in a large quantity of ash. The runway is soft and the jets take a lot of distance to get off. If we were to do it again a AB rock and roll it like asphalt would work better. You do not want any thing to fine under it . It will work its way through it and now the runway will be dirty. Asphalt is the way to go but costly when you do not own the property or have a long lease. Good luck Dan